Types Of Enthalpy Changes In Chemical And Chemical Changes

Types Of Enthalpy Changes In Chemical And Chemical Changes
Enthalpy changes in chemical and physical processes– M1 and D1
By sharing electrons, atoms within a molecule that are attracted to one another is called an
intramolecular force. Between the molecules intermolecular force, the physical properties for
example the melting points and boiling points, relate to the solubility and the strength of these force.
Protons are positive components and electrons are negative components. The attractive force that
exists between the two is known as an intermolecular force due to the atoms and molecules of the
substance. Intermolecular forces have four types:
Ionic forces – This is like the dipole–dipole interaction but it differs slightly as ions are used as well
as polar molecules. ions are held together by electrostatic forces in ionic solids. The charges in an
ion are attracted to each other because they are opposites. "This force is the strongest intermolecular
force." In a crystal lattice structure, the ion forces hold the ions together.
https://www.nature.com/articles/srep35684 Dipole Forces – When a molecule has two poles they are
called dipoles or polar covalent molecules. The molecule will have a partial positive charge on one
pole whilst the other pole will have a different charge that is partially negative. Therefore, the
molecules will rearrange themselves so the charges are attracted to the opposite charge so it works.
Hydrogen Bonds– "when the hydrogen of an electronegative atom of one molecules is attached to
an
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Chemical Change and Observation Lab
Lab Report 2
Observations of Chemical Changes
Objectives: (1 of 20 points)
The objectives of this experiment are:
1. To observe some properties of chemical reactions
2. To associate chemical properties with household products
Background Information: (2 of 20 points)
Chemical changes are often accompanied by physical changes. Three that you should not see in this
lab are changes in temperature, presence of a flame, and evolution of light, as when as firefly glows.
Three physical changes that indicate a chemical change may have occurred (and that may be seen in
this lab) are:
1. Color changes
2. Precipitate (formation of a solid)
3. Formation of gas bubbles
Procedure: (1 of 20 points)
No preliminary dilution of my test chemicals ... Show more content on Helpwriting.net ...
What are chemical changes? Give some examples.
Chemical change results in one or more substances of entirely different composition. Chemical
change requires a chemical reaction.
Burning a log of wood

Mixing an acid with a base, producing water and a salt.
Photosynthesis
Oxidation examples: rust or tarnishing
Combustion
Rotting of fruit
Cooking rice
Explosion of fireworks
Lighting a match
Chewing/digesting food
Burning gas in a stove
Oxidizing food for energy
Roasting a marshmallow
5. What evidences of physical changes have you seen in this experiment?
The tearing of the paper towel into strips; The absorption of the liquid into the paper towel strips
(experiment k).
6. What evidences of chemical changes have you seen?
Change in color once chemicals were combined (experiments b,c,d,e,f,g,h,j,l); Precipitate formation
(experiments g,j,l), and formation of gas bubbles (experiment a).
7. Write balanced chemical reactions for reactions a,f,g, and j above.
a. NaHCO3+HClNaCl+H2O+CO2
f. NaOCl+KINaCl+KIO3
g. 2KI+Pb(NO3)2PbI2+2KNO3
j.

Is The Solubility A Chemical Or Physical Change?
In order to clearly comprehend whether the solubility is a chemical or physical change, we must
under the definition of it in the first place. Solubility means the ability for a substance to actually
dissolve or in other terms solute in a solvent. Also, we need to know the difference between a
physical or chemical change. In a chemical change, a chemical reaction occurs in which a new type
of substance is established. In a physical change, the change itself does not alter what the substance
is causing it to remain the same. The substance which dissolved in water was only salt. Solubility as
a whole in my opinion is physical because no chemical changes occur to the salt substance,
therefore, it is not chemically changed. As we already know,

Chemical Change Lab Report
Purpose/Introduction: The objective of this lab was to recognize and differentiate between physical
and chemical changes in matter. Physical change can be defined as a usually reversible change from
one state (solid, liquid, or gas) to another without a change in chemical composition. The physical
properties of a substance––such as size, shape, density, or state––are altered. An example of a
physical change is ripping paper. A chemical change can be defined as a usually irreversible
chemical reaction that results in the formation of one or more new substances with different
chemical properties and compositions from the original material. Some signs of a chemical change
can include changes in color, the formation of a precipitate (a solid ... Show more content on
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Dissolving NaCl was a physical change because dissolving is reversible. If the mixture was allowed
to sit and the water evaporated, the salt would remain. Therefore, the composition of the salt did not
change.
Mixing NaCl and AgNO₃ was a chemical change because when the two were mixed together a
precipitate formed and the mixture turned white and cloudy.
Cutting Mg ribbon was a physical change because only the size changed which is a physical
property.
Adding HCl to Mg was a chemical change because the test tube got hot because of the heat energy
which is a sign of a chemical change. The mixture also fizzed, which is another sign of a chemical
change.
Grinding CuSO₄ ⋅ 5H₂O was a physical change because the particles were only made smaller and
nothing else changed.
Heating CuSO₄ ⋅ 5H₂O was a physical change because the color changed and that is an example of
an intensive physical property.
Mixing Fe and S was a physical change because once mixed the two could be separated with a
magnet.
Heating Fe and S was a chemical change because the two chemically combined. The magnet could
no longer separate the

Detecting Signs of Chemical Change
Detecting Signs of Chemical Change REAC 399 Prepared by: Elizabeth G. Perez Date of
experiment: October 3, 2006 Course: Chemistry 100/60 Abstract: The objective of this experiment
will be to combine various substances, liquids and metals, and to observe their behavior when they
are combined. The types of reactions observed shall determine the nature of these reactions:
physical or chemical. Introduction: An elements¡¦ reaction to certain substances may be predicted by
its placement on the Periodic Table of Elements. Across a period, an element on the left will react
with more vigor than one on the right, of the same period. Vertically, as elements are sectioned into
groups, the reaction of each element increases ... Show more content on Helpwriting.net ...
Discard the solution in the appropriate container as directed to you by your lab instructor. E. Wash
your hands and all of the equipment with mild soap and water. As a final rinse on the equipment, use
deionized water. Dry all equipment thoroughly. Data Table Substance Observations Was there a
chemical change? 1 0.1M cobalt (II) chloride hexahydrate 95% ethanol Product turned deep blue in
color yet remained clear of precipitate. Yes. 2 0.1M cobalt (II) chloride hexahydrate dissolved in
95% ethanol Water Product turned medium pink in color yet remained clear of precipitate. Yes. 3
Zinc 1M hydrochloric acid solution Product bubbled upon addition to the hydrochloric acid; liquid
turned cloudy ¡V precipitate was present; zinc sample disintegrated slowly and turned black in color.
Yes. 4 Zinc 0.1M copper (II) sulfate solution No vigorous reaction occurred; rather, the zinc sample
disintegrated slowly and turned red in color. Yes. 5 0.1M copper (II) sulfate solution 1M
hydrochloric acid solution No reaction occurred. No. 6 0.1M copper (II) sulfate solution 0.5M
sodium hydrogen carbonate solution Heavy precipitate emerged immediately and solution turned
white in color; solution then became opaque and turned light, bright blue in color. Yes. 7 0.1M
copper (II) sulfate solution 1M ammonia solution Medium amount of precipitate became present;
solution then became opaque and turned medium blue in

LAB 4 Observations of Chemical and Physical Change Part 1
LAB REPORT 4
Observations of Chemical and Physical Change PART 1 – OBSERVATIONS OF CHEMICAL
CHANGE
No credit will be given for this lab report if the Data section is not completely filled out and if the
required photographs are not received. At least one photograph must show the student's face.
OBJECTIVES
1. Observe physical and chemical changes.
2. Define physical and chemical change.
3. Identify the relationship between a chemical change and a chemical reaction.
4. Observe several indicators of a chemical reaction.
5. Associate chemical properties with common items (food, household products).
PROCEDURE
Please complete the entire experiment as instructed in the lab manual except for any modifications
noted below. Fill out the ... Show more content on Helpwriting.net ...
Define physical change. . A chemical change is usually reversible change in the physical properties
of a substance, as size or shape.
2. Define chemical change. A chemical change is usually irreversible chemical reaction involving
the rearrangement of the atoms of one or more substances and a change in their chemical properties
or composition, resulting in the formation of at least one new substance.

The indicators of the chemicals changes that has happened were, heat was produced (when the blue
flame occured because of methane and oxygen gas heated the watch glass) in reaction 1, the bottom
of the watch glass became black (changed colour and a precipitate was formed) due to the same
procedure but less oxygen for reaction 2, and the colour changed for the foil and bubbles/gases were
produced for reaction 3. Moreover, in reaction 4, the colour of the copper also changed and the
smell was like smoke. In reaction 5, the colour of the solution changed continuously as mentioned in
the observations, with bubbles, gases (oxygen), and heat were produced. And lastly in reaction 6,
hydrogen gas were produced because of the burning splint test, indicating that a gas was produced.
Temperature change occurred in some of these reactions (e.g., reaction 1, reaction 5, etc.), making it
one of the indicators of a chemical change as well.
The splints in reaction 5 and 6 (glowing and burning) were not part of the chemical change, because
these were the tests for gases, which will help indicating the types of gas might occurred during the
reactions above. ... Show more content on Helpwriting.net ...
To prove this, carbon dioxide was produced in the flame for reaction 1a making it blue, and instead,
carbon monoxide was in 1b making it orange, which come to a conclusion that carbon monoxide
only occurred in a chemical equation for incomplete combustion, and carbon dioxide only occurred
in a complete combustion (Nanda

Physical and Chemical Changes Chemistry Lab Report
Objectives
The main objective of this experiment is to differentiate between a physical change and a chemical
change. A physical change includes a change in the material without affecting its composition, such
as the physical state change. However, a chemical change includes the change in the composition of
the substance. The change in color, formation of a gas or a solid product, and the production of
energy are the evidences of a chemical reaction, thus, of a chemical change. Materials
Crucible tongs Evaporating dish Glass rod Test tubes Test tube rack Thermometer Analytical
balance Magnesium ribbon pH paper 1M copper (II) sulfate Iron metal 6M hydrochloric acid
Procedure
Magnesium and oxygen ... Show more content on Helpwriting.net ...
The ribbon was transformed into grey ash. When the tip of the rod touched the pH paper, the color
of the pH paper became blue.
Iron and copper (II) sulfate
After 1 minute, a slight change in the color of the iron strip was noticed. It became somehow darker.
After 5 minutes, the iron strip color starts to change. After 15 minutes, the iron strip was corroded
(its color was reddish brown), and the color of the solution slightly changed to green.
Iron and hydrochloric acid
Initial temperature of the 6M aqueous HCl: 28 °C Initial iron strip mass: 0.472 g Highest
temperature observed: 28.5 °C Bubbles were observed. Mass of the final iron strip: 0.469 g The
color of the solution was turning slightly into yellow and the color of the iron strip into white.
Interpretations
Magnesium and oxygen test
The first experiment is about the combustion of magnesium after which the ash is formed.
Hence, it's a chemical change. The balanced chemical equation for this change is:
2Mg+ O_2 □(→┴ ) 〖2MgO〗_((s))

The solution of the formed ash and the water is basic, which was shown using the pH paper where
its color became blue. A chemical change occurred. It is described using the following chemical
reaction:
MgO+ H_2 0□(→┴ ) Mg〖(OH)〗_2
Iron and copper (II) sulfate
The second experiment is about corrosion where a reaction–redox occurred.
It is a chemical reaction where the colors of both solution and iron strip changed. It is

Reflection Of The Energy Change Of A Chemical Reaction
Chemical reactions usually involve the absorption or release of energy, often as heat. When a
chemical reaction occurs at constant pressure, the energy released is equal to the heat flow and is
known as enthalpy. Heat is a form of energy that flows into or out of a system because of
temperature differences. If a reaction releases heat, it is exothermic; if a reaction absorbs heat, it is
endothermic. The enthalpy change of a reaction is measured using a calorimeter, an insulated device
that prevents the reaction from losing heat to its surroundings, creating an isolated system in which
energy is constant. Therefore, the energy change of a reaction in a calorimeter is due only to the
chemical reaction. The enthalpy change of a chemical reaction in a calorimeter is measured using
the formula q=mCspT in which q is the heat released or gained, m is the mass of the solution, Csp is
the specific heat, the amount of heat absorbed per gram multiplied by degree Celsius, and T is the
difference between the initial and final temperatures. Once the heat is calculated, it will be divided
by the moles of substance present in the solution in order to calculate the change in enthalpy of the
reaction. In this experiment, 25mL of HCl will be mixed with 25mL of NaOH in a calorimeter. The
temperature change of the solution will be measured and used to determine the heat released by the
solution according to the formula q=mCspT. The mass of the solution will then be used to determine

Chemical Changes Lab Report
Sam Rolfes Chemical or Physical changes August 31, 2015 Purpose Identify if it is a chemical or
physical change Safety Avoid inhaling any dusts Clean and dry test tubes Don't inhale fumes Make
sure to wash down all chemicals Don't drink the liquids Prelab Questions 1. Identify the following
as either chemical or physical: a. Striking a match – C b.Food spoiling – C c. Breaking a glass – P d.
Mowing the grass – P e.Leaves decaying – C f. Boiling water – P 2. In your own words, state the
Law of Conservation of Mass. Nothing is created or destroyed just changed. 3. List the indicators of
a chemical change a.Gas exchange b.Precipitate formed c.Temperature change d.Color change 4.
Identify each as an element, compound, or mixture. a.Air ... Show more content on Helpwriting.net
...
A physical change is when you can change it back without a reaction. A chemical change is when
you need to make a reaction to separate them. In experiment 1 it was a physical change because the
sulfur and iron filings were just a heterogenous mixture. In experiment 2 it was a physical change
because when we poured the liquid in the the warm water we just cooled it off into a solid so it
didn't have a chemical change. In experiment 3 it was a chemical change because it had a
temperature change and a gas exchange happened. In experiment 4 it was a chemical change
because it had temperature change and gas exchange. In experiment 5 it was a chemical change
because it formed a precipitate and it changed color to white. In experiment 6 it was physical change
because it was salt water which can be

Introduction: When a chemical change occurs, the composition of matter has changed (Myers 2003).
Physical changes are changes in appearance but not the actual substance (Carolina Biological
Supply Company 2012). A change in state is a physical change (Brown et. al 2015). The formation,
breaking, or rearrangement of chemical bonds cause chemical changes (Carolina Biological
Company 2012). The production of a gas, production of a precipitate, production of light,
production or absorption of heat, and an unexplained change in color are visual signs of chemical
changes (Carolina Biological Supply Company 2012). The problem of this lab is, "How can you
determine if a change was physical or chemical?" The hypothesis is, "A physical change is
identified ... Show more content on Helpwriting.net ...
The temperature of the product was monitored. The product was observed for one minute. At station
8, the temperatures of the HCl and sodium hydroxide (NaOH) were measured. Five milliliters of
NaOH were placed in the test tube. Five milliliters of HCl were added to the test tube. The
temperature of the product was monitored. The product was observed for one minute. At station 9, a
cardboard box was set on its side. All but the front opening were sealed shut. Three drops of CuSO4
were dropped in the center of the petri dish. The petri dish was placed in the darkest portion of the
box. With the petri dish still in the box, 3 drops of luminol (C8H7N3O2) solution were added to the
CuSO4 solution in the dish. The product was observed for one minute. At station 10, the
temperatures of CuSO4 and NaOH solutions were measured. Five milliliters of NaOH were placed
in the test tube. Five milliliters of

Substances differs from each other as each of the substances have different atomic composition and
structures. And although the substances that shares the same characteristic can be grouped together,
each of the substances still have their own unique and defining physical and chemical properties.
Therefore, some substances may undergo a chemical change while others don't during a same
reaction. In the experiment conducted, two different elements were used, Iodine crystals, I2 and
Copper wire, Cu. After recording the initial observation on both of the elements, they were both
heated and allowed to cool. The copper wire, initially bronze in colour, glows red during heating
and is black in colour at the end of the experiment. Meanwhile, the black ... Show more content on
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A few drops of hydrochloric acid, HCL were added to both of the solutions and the observations
were recorded. It is observed that bubbles were formed in the sodium carbonate solution. It can be
said that effervescence occurred during the reaction. Effervescence can be defined as the escape of
gas from a solution and the foaming and fizzing that results from the release of a gas. As there is a
gas that is released from the solution, the composition of the solution and its molecular formula
must have undergone a change during the reaction and this change can be classified as a chemical
change. This is because, when the sodium carbonate solution reacts with the hydrochloric acid, it
will produce sodium chloride, NaCl, water, H2O and carbon dioxide, CO2. The gas bubbles
produced were carbon dioxide gases. As the final substance differs in composition and in their
molecular formula with the original substance, it can be concluded that the change in this reaction is
a chemical change. Different with the sodium hydroxide solution, NaOH, that doesn't show any
visible changes when it reacts with the hydrochloric acid. Although there is no visible change that
can be observed, this does not mean that there is no changes taking place during the reaction. As
sodium hydroxide is an alkali, when it reacts with the

Physical and Chemical Changes Essay
Shelby Brown
8/28/10
Physical and chemical changes lab essay
Changes in matter occur every day. There are two types of ways matter can be altered; physically
and chemically. Physical changes do not change the composition of the matter while chemical
changes occur when one or more substances turn into a completely new substance. Physical changes
can be seen through an altering of the substances physical property. A substances physical property
is observed and measured without changing the composition of the subject. Descriptive words that
would help to identify a substance's physical property include hard, soft, brittle, flexible, heavy, and
light just to name a few. When an object goes through a physical change it ... Show more content on
Helpwriting.net ...
The relationship of reactants and products is shown by a chemical equation. An example of a
chemical change that one could come into contact with daily is rust. Air and iron are the reactants in
this situation while rust is the product. The chemical equation for this reaction would look roughly
like this, O+FE= OFE or rust. This is clearly a chemical change because you cannot reverse it
meaning you cannot take rust and pull out the iron to leave air or vise versa. All chemical changes
are finite. One other example of a chemical change is the burning of any substance. For example if
one were to burn a sheet of paper it would create ash. This chemical change is finite because you
cannot change ash back into paper. Another term to remember when considering changes chemical
and physical is the law of conservation of mass. This law simply means that matter can neither be
created nor destroyed. Two other terms that are important when describing the properties of
substances undergoing changes are extensive and intensive properties. An intensive property is a
physical property of a substance that does not depend upon its size such as viscosity. Extensive
properties however do depend on a substance's size such as mass and volume. A few more important
terms to keep in mind when doing a lab with chemical and physical changes are

Chemical Change Research Paper
A chemical change is caused in the formation of one or more new substances. Key features of
knowing that a chemical change has occurred is seeing a change in colour, smelling a gas or seeing
bubbles, seeing a new solid (known as precipitate) forming in a clear solution, observing that energy
is produced or absorbed in the form of heat or light. An example is when applying Hydrochloric
Acid onto Litmus Paper; the paper changes colour. A physical change is different because it occurs
when no new substance is formed and the changes are reversible. To tell if a physical change has
occurred, there may be a change in shape or expansion and contraction. An example is when metal
gets really hot in the sun, the metal expands. Therefore, this is why

Essay on Observations of Chemical Changes
Experiment
In this lab we were asked to observe changes and colors when mixing two or three chemicals
together. The actual experiment itself used twelve different pipits and three chemicals I selected
from my house. To begin, I first gathered everything, including the 96 well plate, 24 well plate,
goggles, and gloves along with the observations of chemical changes bag. I set it up all on the the
kitchen table that had paper towels on it. Next, I made my data table so that I could record my
reactions. Third, I sat all the pipets in the 24 well plate. At this point, I began the lab by following
the instructions for each chemical. I had to drop two drops of the first chemical into one well,
followed by two drops of the second chemical ... Show more content on Helpwriting.net ...
F1 Kl and Pb(NO3)2 mustard, cloudy look no change when on white or black paper
G1 NaOH and phenolphthalein violet color no change on white, but deeper violet on black paper
H1 HCl and phenolphthalein faint white cloudy look color was more visible when on the black
paper over the white
A3 NaOH and AgNO3 brown muddy color, thicker no change when on white or black paper
B3 AgNO3 and NH3 no change until the light no paper change, however when under the light for a
minute it began turning a orange brown color
C3 NH3 and CuSO4 aqua and cloudy looking no change in color over papers noticed, if any small.
Data Table 2 – Observations of Chemical Changes, using chemicals in house with BTB
Well # Chemicals Used Reaction Paper Change
D3 Cleaner w/bleach and BTB started as a blue, then turned pale yellow no change noticed
E3 Multi–surface cleaner and BTB Blue with bubbles could see bubbles a little better when on the
black paper
F3 Mr. Clean Antibacterial and BTB Royal Blue a little darker when on the black paper than on the
white
Observation
The observation of this lab is detailed in the data table above. The three main changes that were
noticed when chemicals

The Cycle Of Chemical Changes And Reactions Involving...
The Cycle of Chemical Changes and Reactions Involving Copper *Timothy Tomblin, Cade
Adelman, CHEM 111, Sec. 550 Introduction The experiment was performed to show the many
chemical reactions and states of copper, a very common yet important element that can is found in
many useful compounds throughout the world. Copper was combined with many different
compounds and elements to cause chemical changes in the state of copper. These reactions were
conducted to display the several different states of copper throughout the cycle, ultimately restoring
the copper after the metal seemingly disappeared. Material and Methods A hot plate was placed on a
ring stand with a 50 mL beaker being placed on a hot plate. The ring on the ring stand was
positioned to surround the beaker. Rubber tubing, a funnel, and an aspirator was then used to make
an aspirator, with the funnel placed over the beaker connected to the aspirator. The HNO3 used in
Step 1 will give off toxic gas, which the funnel will prevent from spreading away from the beaker.
250 mg of copper was weighed and transferred into the 50 mL beaker. 5 mL of M HNO3 was
poured into a 10 mL graduated cylinder. The aspirator was turned on by starting the water and 4 mL
of HNO3 was added to the beaker and slowly heated with the hot plate. After the reaction occurred
the aspirator was turned off and 10 mL of distilled water was added to the beaker. 6 M NaOH was
added in drops to the solution and stirred with a stir rod while periodically

Essay on Observations of Chemical Changes
Chem 181 DL1
Professor Snyder
Rebecca Hansen
9/10/12
Experiment: To examine the reactions of some common chemicals contained in
Consumer products and observe the macroscopic changes these chemicals undergo. Examining
reactions of common chemicals contained in consumer products. In this lab, it will show the
macroscopic changed the chemicals undergo.
Objective: To observe some properties of chemical reactions and to associate chemical properties
with household products.
Chemicals used in this lab were: Ammonia (NH3) Bromthymol Blue (BTB), Copper (II)
Sulfate(CuSO4), FDC Blue Dye #1, Hydrochloric acid (HCl), Lead (II) Nitrate(Pb(NO3)2),
Phenolphtalein Solution– (C20H14O4 ), Potassium Iodide ... Show more content on Helpwriting.net
...
Food | Chemical | Reaction | Onion | Starch | Yellow/brown – no starch present | Cracker | Starch |
Black– starch present | Banana | Starch | Black–Starch Present |
A. Suppose a household product label says it contains sodium hydrogen carbonate (sodium
bicarbonate). How would you test this material for the presence of sodium bicarbonate?
a. I would test it with multiple chemicals in separate well plates to see if they react the same way it
did in the primary experiment. For this one I would add regular vinegar to it. It is a household acid.
B. You know what color phenolphthalein and Bromthymol blue turn when testing an acid or a base.
Use the empty pipet in the Auxiliary Supplies Bag to test several (at least 3) household items
including household cleaning products with Bromthymol blue. Rinse the pipet well before using it
on the next household chemical. When finished with this experiment rinse the pipet well and return
it to the Auxiliary Bag for use in future experiments. Name the items tested and record their results.
What do these results mean? Product | Reaction with White paper | Reaction with Black paper |
Vinegar + BTB | Clear | Dark Yellow | Clorox Bleach+ BTB | Turned blue than light green | Dark
green | Dish Soap(yellow) + BTB | Light Green | Dark Green |

C. You found a sample of a solution that has a faint odor resembling vinegar. You are verifying that
it is indeed vinegar and you add a few drops of phenolphthalein.

Purpose:
Can a chemical change be determined?
Hypothesis:
A chemical change can be determined by one or more of the following, the creation of gas, heat,
precipitate or colour change. It cannot be easily inversed.
Materials:
Safety goggles
2 small test tubes
Test–tube rack
4 labelled medicine droppers
2 mL distilled water
Indicator solution (phenolphthalein) in a dropper bottle
2 mL of Solution A (0.5% sodium hydroxide)
2 mL of Solution B (2.0% sulfuric acid)
2 mL of Solution C (2.0% calcium chloride)
2 cm2 of aluminum foil
10–mL graduated cylinder
2 mL of Solution D (2.0% copper (||) chloride)
Procedure:
1. Put on your safety goggles and roll up your sleeves
2. Take a test tube and place it in the test–tube rack. Use a medicine dropper to add 5 drops of water
to the test tube. Then add 2 drops of indicator solution to the water.
3. ... Show more content on Helpwriting.net ...
Use a second dropper to add 5 drops of Solution A to the water/indicator solution.
4. Use a third dropper to add 5 drops of Solution B to the solution.
5. Use the fourth dropper to add 5 drops of Solution C to the solution.
6. Scrunch up a small piece of aluminum foil and put it in a second test tube. Set it in the test–tube
rack. With the graduated cylinder, quantify 2 mL of Solution D and add it to the test tube.
7. Dispose and clean up the contents of your test tubes and put away all of your materials. Clean up
your work station and hands.

Identification Of Chemical Change Lab Report
CHM130
Lab 3
Identification of Chemical Change
Name: Nolan Strommer
A. Data Table (24 points)
Place your completed data table here:
Reactants Predictions Before
Combining Observations After
Combinin g
Starch + I2 It becomes purple It becomes blue and a little purple.
Food coloring + NaOCl The color of the food coloring will disappear. The color of food coloring is
on the top of NaOCI, NaOCI is under the food coloring.
Food coloring + CH3COOH The color will be the same as the food coloring The color becomes to
the food coloring color.
Food coloring + NaOCl
+ CH3COOH It will have foam and the food coloring color. It has foam in the color of the food
coloring.
Red cabbage + NH3 It becomes green It becomes green and a little yellow. ... Show more content on
Helpwriting.net ...
Therefore Iodine can be utilized to detect the presence of starch since the reaction of I2+ I– gives us
I3 – . What this means is that any substance that becomes blue/black after iodine has been added to
it proves that the substance has starch in it. Interestingly enough, when Iodine is added either to
white rice or sweet potatoes, these two foods turn to the blue black color that confirms the presence
of starch. However, If I add iodine to a banana, it only turns yellow which confirms that the banana
does not contain iodine.
6. Red cabbage juice is a natural, universal indicator. When a solution of red cabbage is red to pink,
it indicates that a solution is acidic. When it is green to yellow, it indicates that a solution is basic.
When it is purple to blue, it indicates a solution is neutral. Would you characterize vinegar and

ammonia as acids or bases? Explain. (15 points)
Answer:
Vinegar is acid because red cabbage juice+CH3COOH will become red and a little pink. Ammonia
is base because NH3 which ammonia contains add red cabbage juice will become green and

Chemical Reactions Of Energy And How It Changes Essay
Thermochemistry deals with energy and how it changes. We performed chemical reactions in a
calorimeter, which is a device scientists use to determine the amount of heat produced by a process
(or change). Processes that absorb energy are endothermic and processes that release energy are
exothermic. Endothermic, processes that absorbed energy produced positive results. Where as,
exothermic, processes that release energy produced negative results. This experiment also dealt with
specific heat. Specific heat is the amount of heat gained or lost when one gram of a substance
changes temperature by one degree Celsius. Our experiment this week explored these concepts.
Experimental Procedures
In this experiment, we performed chemical reactions in a calorimeter to determine the amount of
heat produced by heat (temperature) change. In part one of the experiment, we set up our
calorimeter as shown in a diagram given. We connected it to our computer for data collection with
the temperature probe. To start data collection, we first mixed 15 mL of 1.0 M HCl solution and 20
mL distilled water and recorded the initial temperature. Next, we added 25 mL of 1.0 M NaOH
solution to the mixture. To homogenize the mixture, mix gently until the maximum temperature has
been reached and record that as the final temperature. Next, we needed to calculate our results for
the heat of reaction ΔH in units of Joules. In a chart, we recorded the total mass of our mixture and
determined the number of moles

Understand The Difference Between Chemical And Physical...
It is important to understand the difference between chemical and physical changes. Some changes
are obvious, but there are some basic ideas you should know. Physical changes are usually about
states and physical states of states. An Example of a physical change is an ice cube going from a
solid–liquid–gas. Some examples of physical changes, Melting, boiling, breaking, cutting, and
dissolving is a physical change. Chemical changes happen on a molecular level when you have two
or more molecules that interact. Chemical changes happen when atomic bonds are broken or created
during chemical reactions. Anything that is burning is a chemical change. Or frying an egg is a
chemical change cause it can not go back to wear it was before theres no fixing.

Chemical Change Research Paper
There are many different changes between a physical and chemical change in a substance or matter.
Have you ever wandered what the changes and differences are? In a chemical change there is a
chemical reaction and the substance changes. In a physical change the substance does not change.
These changes can affect people's lives in so many ways. What are the similar traits? There is not
very many similar traits about these two changes. One similarity that they both have is that they
both require energy to change the substances. Also, they both form new products as a result of the
reaction. For example, a physical change can be changing water into ice which is a new substance. A
chemical change would be cooking an egg because you can not change

Chemical Changes
Chemical and physical changes.
Atilio Quintanilla
5B
Ms. Gowan
Chemistry
First let's start with with something simple Chemical Changes most Chemical Changes take place
on the molecular level. Chemical change produces a new substance. For example another way you
can think of it is that a chemical change accompanies a chemical reaction grat examples of chemical
change are combustion in other words burning, cooking an egg is also a great example of chemical
change also rusting of an iron pan, but for a more detailed chemical change a great example would
be mixing hydrochloric acid and sodium hydroxide to make salt and water.
Next is the Physical Change, physical change are more concern with energy and state of matter.
Always remember a physical change does not produced a new substance, but it could be that the
starting and ending ... Show more content on Helpwriting.net ...
Now I'm going to explain details examples of Chemical change and physical change first let's start
with chemical change sugar undergoes through a chemical change when is cooked to make caramel,
first the sugar sugar is heat up and this heats makes a reaction and it converts the sugar molecules
into different molecules that give caramel it's color and flavor by doing so this is classified as a
chemical reaction because it changes the molecules of the

Investigating The Chemical And Physical Changes Throughout...
Problem: The purpose of this particular lab was to experiment and identify the chemical and
physical changes throughout the experiment. Material: Refer to Science Activity 8.1 – Evidence of
Reactions Worksheet Procedure: Refer to Science Activity 8.1 – Evidence of Reactions Worksheet,
page #1–6 Observations: Original Temperature of H2O (Water): Using a thermometer we observed
the measurement of the water "H2O" in the beaker, and it resulted in an initial temperature of 20 ⁰ C.
CuCl2 (Copper Chloride): The Copper Chloride displayed and used to complete this lab had led us
to the following observations; – Copper (II) Chloride is a substance that takes up the shape of a solid
form. – The substance is highly hazardous for skin and ... Show more content on Helpwriting.net ...
The solution had an opaque image, meaning if you were to look through the mixture you would only
see a light blue liquid, thus the solution was not transparent. Furthermore, the solution from the
Copper Chloride and Water dissolved together had demonstrated one solid colour– thus the light
blue colour from the solution was spread evenly through the beaker and no other particles were
visibly seen. Temperature of Stirred CuCl2 (Copper Chloride) + H2O (Water): The quantitative
observation made from the temperature of the CuCl2 water using a thermometer is that the Copper
Chloride Water had remained the initial temperature of 20⁰c, hence adding the Copper Chloride to
the water would not make a difference in temperature as the mixture is a physical change. CuCl2
(Copper Chloride) + H2O (Water) + Aluminum foil: Before placing the Aluminum foil into the
Copper Chloride Water (CuCl2 + H2O), I had examined the characteristics of the aluminum foil. It
came to view that the Aluminum foil was a silver–coloured, shiny metal. When the aluminum foil
was placed into the CuCl2 Water solution, several observations were made. Procedure Observations
Observations of aluminum foil in Copper (II) Chloride Water Solution –Bubbles of gas began to
produce itself around the aluminum which had appeared to let off vapor – The copper chloride
attaches itself to the aluminum

Essay about Lab Observations of Chemical Changes
Purpose: The purpose of this experiment is to observe chemical changes in common consumer
products to determine if the chemicals are basic, acidic, or remain neutral when mixed with other
chemicals.
Procedure: In this experiment, various chemicals were mixed together, to determine a reaction.
Using two drops from chemical 1 and two drops of chemical two, unless otherwise stated, then
recording the type of physical reaction or color changes that occurred.
Well#/questions Chemicals Reactions
A NaHCO
3
and HCI – C0
2
When combined Sodium Bicarbonate and Hydrochloric Acid, Carbon Dioxide is produced. The two
chemicals do not undergo a change in color but a chemical change when CO2 is produced. ... Show
more content on Helpwriting.net ...
Meaning the combination produces a base.
Questions:
1.) Suppose a household product label says it contains NaHCO3. How would you test this material
for the presence of sodium bicarbonate?
a. Add hydrochloric acid to the household product, and if the chemicals began to bubble, once
mixed together, then this would indicate that sodium bicarbonate is present.
2.) You know what color phenolphthalein and BTB turn when testing an acid or a base. Use three
household cleaning products with BTB. Name the items tested and their results:
a. Windex: when combined with BTB this cleaner changed orange, indicating that the cleaner has an
acidic ph.
b. Fabuloso: When combined with BTB this cleanser changed to light blue, indicating that this
cleaner is basic.
c. Bleach: when combined with BTB this cleaner changed orange, indicating that the cleaner has an
acidic ph.
3.) You find a sample of a solution that has a faint odor resembling vinegar. You are verifying that it
is indeed vinegar and you add a few drops of phenolphthalein. The sample turns pink. What

assumptions can you make about this sample?
a. Vinegar is a common household product, when mixed with the indicator, phenolphthalein, it turns
pink. This indicates that Vinegar is acidic.
4.) You want to investigate a new wave of vitamin water is pH neutral. Results are: Three of the five
samples turn a murky

During the preparation of the, "Turning Pennies Green", lab, students were asked to perform an
experiment at home. The lab demonstrates what the effects of chemical and physical changes are.
Students were asked go home, put two pennies in separate bowls, and label one bowl cup A, water
and cup B, vinegar. Then, they were asked to place paper towels in the bowl. For cup A, water was
to be poured in, but just enough to wet the paper towel inside, so the penny was not submerged. The
same was asked for cup B, but the substance used instead of water was vinegar. Over that past four
days, students were asked to check and observe what was happening during the experiment. One
could observe that the water caused the penny to change into a tedious state. ... Show more content
on Helpwriting.net ...
Chemical changes can change the state of matter; creating something very different than the original
matter. Vinegar changed the state of matter of the penny by the help of oxygen. For instance,
pennies are made of copper, along with other metals. The paper towel allowed the vinegar and
oxygen to work together to create an entirely new state of matter that the copper was in. The outer
layer of the penny was transformed into a green–like substance, which had an entirely different state
of matter, then when it started out as a copper penny. For example, after recording the data of the
penny's transformation of a chemical change, the evidence states, "The penny is starting to turn a
dark green. There is a green circle surrounding the outside of the penny, staining the white paper
towel. Although green is forming, the penny looks cleaner than it was before," Because vinegar's
has been used to eliminate germs and harmful bacterial. Vinegar is known to be a cleaning product,
so it must have eradicated the bacteria and grime on the penny. The data shows that green is starting
to form. Therefore, a chemical change is taking place because copper is turning into a new metal.
Based off of the experiment, it is easy to conclude that vinegar with the combination of air, causes a
chemical change on

Chemical vs Physical Change Lab
Chemical Changes VS Physical Changes
Lab Report
(Full Name)
3rd period
Purpose: To observe the difference between chemical and physical changes.
Materials:
* * Hot plate * Water * Salt * Evaporating dish * Candle * Matches * Ammonium hydroxide *
Watch glass * Phenolphthalein * Paper towel * Cornstarch * Iodine * Cup * Alka–Seltzer tablet *
Pipet * Milk * Vinegar * Copper II sulfate * Lead II nitrate
Safety: * Goggles were worn. * Aprons were worn. * Lab station was cleaned up directly following
experiments. * Hands were washed after experiments. * No eating or drinking took place in the lab.
* Experiments were not conducted ... Show more content on Helpwriting.net ...
A chemical change is a change that alters the identity of a substance. A chemical change can be
identified by five things: change in mass, formation of a precipitate, release of heat and/or light,
color change, or giving off gas. Physical changes occurred in four out of the eight experiments
completed in this lab. The first was experiment one, the salt and water. The salt was added to water
but when the water evaporated the salt remained. The water changed to the vapor form of water and
the salt did not change. The second was experiment two, the candle. When the candle was lit the
heat given off from the fire melted the wax beneath it. Melting is a physical change because the
liquid wax is still wax, its usual form is just a solid. Experiment four dealt with ripping paper. This
was a physical change because, although the paper was being ripped apart, it was (and still is) paper.
The smaller pieces did not change the mass or any other factor of it except the surface area of each
piece. Experiment seven dealt with vinegar being added to milk. The vinegar did not change but the
milk was curdled by the vinegar. Although the milk was curdled, the milk remained milk. The
composition stayed the same. Each of these experiments showed no change in a substance so as it
changed to another substance. Chemical changes occurred in five out of the eight experiments
completed in this lab. Although the main focus of experiment two was

Physical And Chemical Changes Lab Report
Physical and chemical changes are all around us such as that breakfast you had this morning.
"Physical changes cause substances to change form... chemical changes produce a new substance...
Some signs of an energy transformation include changes in color or odor, the production of gas or a
solid, and the release of heat." (Paragraph two) The goal of this investigation was to see the
differences and inference physical and chemical changes. Our guiding question throughout the
experiment was "Which changes are examples of a chemical change, and which are examples of a
physical change?" Our materials for the experiment was Solution A, Solution B, 2% milk, Coca–
Cola, synthetic white flower, Phenolphthalein, butter, ice, magnesium ribbon, and ammonia. ...
Show more content on Helpwriting.net ...
We added 2% milk into a bottle of coke. Within two hours the bottle turned clear with brown
substance at the bottom. I put it as chemical because it had a change of color and substance. The
second experiment was the carnation flower. We took a white synthetic flower and sprayed it with
ammonia. The flower turned a bright pink. I put this as physical because the size was the same. Only
the color changed. The third experiment was the glowstick. We obtained one glow stick and broke
it. The glow stick released a bright yellow light. I put this as physical because it only brightened the
color. The fourth experiment was the Alka–seltzer experiment. We added a full Alka–seltzer and put
it in water in a glass and put a balloon over the glass quickly. The balloon filled with an unknown
gas. I put this as chemical because the Alka–seltzer lost it's shaping due to reactivity to the water
and made a new solution in the bottom of the glass. The fifth experiment was the butter experiment.
We took melted butter in a container and proceeded to put in a bowl with ice. Within 10 minutes the
butter turned into a solid. I stated this as a physical change because it only changed its state. Our
last, and sixth, experiment was the magnesium ribbon. Our teacher proceeded to take a magnesium
ribbon and light it using a lighter. Within seconds the magnesium ribbon started sparking and
burning down the ribbon. I put this as a physical change because it

Lab Report Chemical Change
Purpose: The purpose of this lab is to observe the chemical changes of multiple single replacement
reaction. Materials: Chemicals Laboratory Tools Zinc Chemplate Magnesium Goggles Copper
Toothpicks CuSO4 (Copper (II) Sulfate) AgNO3 (Silver Nitrate) HCl (Hydrochloric acid)
Procedure: Take a chemplate and put one or two pieces of zinc, copper and magnesium as shown in
the figure. Then add 5 to 10 drops of given solutions into each well. Observe the reactions for 10
minutes and record. Data/Observations: Reaction 1 Zn + CuSO4 → ZnSo4 + Cu Hypothesis: There
is going to be a reaction because zinc is more active than copper Your Finding: Color change occurs
and copper is appearing. Reaction 2 Mg + CuSo4→ MgSo4 + Cu Hypothesis: There is going to be a
reaction because magnesium is more active than copper. Your Finding: Color change occurs and
copper is appearing. Reaction 3 Cu + 2AgNO3 → Cu(No3)2 + 2Ag Hypothesis: ... Show more
content on Helpwriting.net ...
The purpose of this experiment was to learn how single replacement reactions occur when tested
and how to identify one. The first test, zinc and copper (II) sulfate, produced copper. The chemical
reaction also had a chemical change, which was a color change. A similar reaction occurred when
tested with magnesium and copper (II) sulfate and copper and silver nitrate. This occurred because
zinc, magnesium, and copper are more active than the elements in the ionic compound. Therefore
the more active element takes over, the equation changes, and a reaction takes place. The fourth
reaction, zinc and hydrochloric acid, produced a gas, hydrogen gas. The final test was between
copper and hydrochloric acid, which resulted in no reaction. Nothing occurred because the hydrogen
is more active than the copper, thus the solution does not change. This lab was successful in
showing the effect of a chemical reaction and how single replacement reactions

In the chemical and physical change lab, we figured out what a chemical change is. A chemical
change is a change in which one or more substances are converted into a different substances. That
means if a chemical change occurred the substances will be turned into a different substance. In
order to know if a chemical change happened you will see bubbles, a color change, energy released
as heat and light or a solid participate. The first example, of a chemical change in this lab is bubbles.
In stations 6 and 8 each had bubbles in them. In station 6 the zinc was put into the HCI acid and
once they touched they got bubbly and cloudy. Also in station 8 when a spoonful of baking soda and
HCI acid touches the solution, it started to bubble and fizz.

Introduction: The purpose of the lab "Chemical or Physical Change" is to analyze changes of matter
and determine whether a physical or chemical change took place based on the observations and
evidence acquired from the six experiments. Based on previous knowledge, a physical change is a
change in a substance appearance that does not involve a change in the identity of the substance.
This type of change in matter only changes the physical properties of the substance which are the
properties that can be observed and measured without changing the materials composition.
Examples include ripping, cutting, cracking, splitting, and changes in states of matter such as
melting or freezing. This type of change in matter can usually be undone. A chemical

Chemical Reaction On Chemical Change
Analyzing chemical change
Abstract
Changes can be chemical or physical in nature. If a chemical change is taking place we will be
breaking bonds and forming new bonds and therefore creating a new substance. In a Physical
change we will have the same substance but simply in a new form. (Dickinson et al. 197). In order
to collect evidence to prove a chemical change is occurring we need a change in the indicators. The
more active a chemical is the more likely it will have a chemical reaction with another chemical.
(Dickinson et al. 180) The higher the element is on the Activity Series the more reactive it is.
(Dickinson et al. 192) A reactive element will replace an element that is underneath it in the activity
series. (Dickinson et al. 192) In this lab we will examine chemical reactions with the activity series,
indicators and the type of chemical reaction it is. The purpose of this lab is to study chemical change
and analyze why and how chemical reactions are created. In this lab we are going to combine
certain chemicals with each other to create a chemical change and we will observe and record any
changes. The chemical reactions listed in the Results had all gone through chemical change and all
the indicators have been recorded. Chemical change is very important and we need to learn more
about them because without chemical change we couldn't perform daily tasks.
Introduction
The purpose of the lab is to collect evidence to prove chemical change from our

Physical And Chemical Change Lab Report
***SAFETY PROCEDURE*** WEAR YOUR SAFETY GOGGLES AND APRON.
PHYSICAL AND CHEMICAL CHANGES
Purpose: In this experiment you will observe some physical and some chemical changes. You will
observe that energy must be used to start some chemical reactions, and that it is produced in others.
Apparatus: Forceps Bunsen burner Funnel Wire gauze Crucible tongs Filter paper Test tubes, large
and small Universal clamp Test tube rack Stirring rod Ring stand and ring Materials: Nichrome
metal Magnesium metal Wooden splints Sodium chloride solution, NaCl, 0.1 M Hydrochloric acid,
HCl, 3M Silver nitrate solution, AgNO3, 0.1M Steel wool Sodium hydrogen carbonate, NaHCO3,
solid Zinc metal, Zn
Theory: Matter ... Show more content on Helpwriting.net ...
Give specific evidence for your conclusions.
1. Nichrome and heat The nichrome wire is silver with a sort of rusty brown color on portions of it
and is not slightly shiny. When the nichrome wire was put into the heat (bunsen burner), the flame
turned from blue to orange, and the wire began glowing orange in the part touching the flame. This
was a physical change because the only thing that changed was the color was changed but went
back to normal, thus indicating that the composition has not changed.
2. Nichrome and hydrochloric acid The nichrome wire exposed to the acid there was nothing that
occurred. Therefore, it was neither a chemical nor physical change.
3. Zinc and hydrochloric acid When the zinc was dropped in the hydrochloric acid, the substance
began bubbling vigorously, forming a precipitate. Eventually, the zinc dissolved completely. After
the lit wooden splint broke the surface of the test tube, there was a loud popping noise. The gas that
was released was hydrogen from the acid and the popping noise was a result of the Hydrogen being
burned up by the fire creating a small explosion. Two chemical changes occurred in this test: one
with the formation of a precipitate (a textbook sign of a chemical change), and the other when the
explosion

Chemical Change In Matter
Topic/Central Focus: Students will observe and identify what a chemical change in matter is.
Students will do this through an experiment and discuss chemical changes as well. It is important
for students to recognize and understand what a chemical change in matter is and how it can apply
in their lives, such as cooking or cleaning.
Prior Student Knowledge: The class is composed of 12 students, with 8 girls and 2 boys. Most of
my students are of Hispanic descent. Most of these students speak Spanish well, but cannot write it.
These students are all reading at grade level, except for one ELL student. In order to make the
lesson relevant to them, we will discuss chemical changes more relatable to them, such as rust that
is found in everyday ... Show more content on Helpwriting.net ...
Have them record the properties of each, giving extra time to the ELL student.
10. Tell students to use the magnets on each.
11. Have them record their observations on the worksheet, allowing extra time for the ELL student.
12. Have students pass up their recordings from their observation.
13. Begin clean up procedures for science.
Transition Tell students to clean up and place items back into place, tell them it is time to move to
the next activity.
Activity #2: Think, pair, share–students will pair up and discuss various different chemical changes
or try to understand one of their peer's understanding of a chemical change–and why it is useful.
Think, pair, share activities are useful since they can participate with each other, promotes thinking,
and there share their information they have learned with the entice class. Time: 10 min. Objective 2
(Elaboration)
1. Have students pair up
2. Tell students that it will be a Think, Pair, Share
3. Have students first think on how rust came on the steel wool.
4. Ask "Are rust and steel the same?"
5. Ask "Remember the changes, the differences, are they still similar or no?"
6. Tell students to think of one time they have seen a chemical change in their

Chemical Change Lab
Laksha Sivathasan Evidence of Chemical Change Abstract: For the lab, what we did was we had
five chemicals to mix. We had a 4x3 spot plate and dropped a small amount of two different
chemicals. When the two different chemicals are combined we would notice if it's acidic or basic. If
we had gotten a clear reaction than we would add one drop of acid–base indicator. And if we have
gotten a green that would indicate that it's neutral. The purpose of the lab was to see the outcomes of
two different types of chemicals mixed together. Before I started the lab my prediction was that
most of the chemicals would show different colours but I was mistaken most of the combined
chemicals were clear and one drop of acid base indicator it showed us if ... Show more content on
Helpwriting.net ...
Develop a plan for reacting only two chemicals at a time in each well of the spot plate. Your plan
must include for method for recording what chemicals were used in each spot as well. iii. Record
your observations for each combination of chemicals. iv. Rinse off and clean and WIPE DRY all
materials as directed by your teacher. Return all materials top the stations you're found them. Refer
to diagram above if more questions needed. Materials you will need: Spot plate 5 chemicals – KL –
HCl – CaCl2 – Pb(NO3)2 – Na(OH) Paper towel (To clean up) Results: When doing the lab, I have
found out that most of these chemicals combined was needed an acid base indicator. If you look at
Figure 2.1 you can see that almost all the chemicals that we have tested were needed a drop of acid–
base indicator to detect if it was acidic or basic. For chemicals KI and Pb(No3)2 ,when combined
both substances quickly went together into a double displacement and turned into a gold color.
Tables and Figures: i. Observation of Reaction Before: Clear + Yellow After: Gold Word Equation:
Potassium Iodide + Lead Nitrate → Potassium Nitrate + Lead Iodine Skelton Equation: KI +
Pb(NO3)2 → K(NO3)2 + PbI Balanced Chemical Equation: 2KI + Pb(NO3)2 → 2 K(NO3) + PbI
Reaction Type: Double Displacement < Figure

To understand this lab there is knowledge prior to the lab that was taught. A physical change is a
change affecting the form of a chemical substance but not its chemical composition. Physical
changes can be used to separate mixtures into their component compounds. An example of a
physical change is a popsicle freezing in the freezer. A chemical change is any change that results in
a new formation of chemical substances. An example of a chemical change is when rust forms on
nail. The signs to look for to see if there is a chemical change are color change, odor change,
production of bubbles and gas, production of heat and light, and production of a precipitate. If any
of these signs happen in the lab it is a chemical change. The question for

In this lab a number of small experiments were conducted in order to observe the reactions of the
materials tested. The purpose of this lab was to have real life experience with using observations to
determine whether or not a chemical or physical change had occurred. Also this lab was used as an
opportunity to improve the ability to write lab reports and make data tables, and to provide
experience with unfamiliar lab equipment.
Firstly to clarify a chemical change is defined as a change resulting in the formation of a new
substance, whereas a physical change is any change not resulting in a change of composition. The
telling observations in which you can use to determine if a change is chemical are if a gas is
released, a new substance if formed, color changes, energy changes, texture changes, order changes,
mass changes, or volume changes. For example three chemical changes are the digestion of food,
the burning of wood, or the ... Show more content on Helpwriting.net ...
As said before the main purpose of the Chemical and Physical Changes lab was to use observations
made in order to determine whether a physical or chemical reaction took place during the
experiments. Knowing that during the experiment six smaller procedures were done each of which
being observed immediately then again either minutes later or a day later in

Physical And Chemical Changes Lab Report
Title: Physical and Chemical Changes
Purpose: Recognize and distinguish between chemical and physical changes
Apparatus and Material: evaporating dish, Bunsen burner, wood splint, test tubes, micro spatula,
dropper, mortar and pestle, test tube holder, safety goggles, lab apron.
Piece of paper, NaCl (sodium chloride), water, 6 M HCL (hydrochloric acid), 0.1 M AgNO3 (silver
nitrate), Mg ribbon, 6 M HCL (hydrochloric acid), CuSO4 5 H2O, 0.50g iron fillings, 0.50g of
powdered sulfur, magnet, copper sulfate solution, zinc metal
Safety: When heating a substance in a test tube, be sure the open end of the test tube points away
from yourself and others. Handle all acids with extra caution. Always wear safety goggles when
handling acids. ... Show more content on Helpwriting.net ...
Heated crystals change color from blue to white; water vapor forms on the walls of the test tube.
Addition of water turns the heated crystals from white back to dark–blue, almost teal color.
5. Sulfur appears as yellow powder; iron is dark–brown powder; mixed together, they look like dirt.
Iron becomes attracted to the magnet, following it if it's close enough; sulfur does not. Magnet can
be used to separate the two mixtures.
6. On heating the iron–sulfur mixture, the sulfur melts and reacts with the iron exothermically to
first evaporate into a yellow gas, then form a reddish–orange, solidified substance that "glows". The
substance releases an unpleasant odor of rotten eggs. The iron on the bottom turns black and does
not react with a magnet. The glowing substance turns out to be a soft solid when probed.
7. Zinc is a silver solid with a light mass. Addition of zinc metal to copper sulfate solution results in
an exothermic reaction that produces a brown–reddish precipitate (copper). Zinc becomes coated
with the copper precipitate, thus becoming dark.
Conclusions and data:
1. a) tearing paper – physical change; retaining of properties, no new substances created
b) burning paper – chemical change, gas and heat given off (evidence of chemical reaction)
c) dissolving NaCl – physical change; solution formed, but individual properties retained; separation
possible by distillation.
d) mixing NaCl and AgNO3 – chemical change; white precipitate, or

Chemical Changes Lab
There's a difference between a chemical and physical prop–erties/changes. Physical properties are
an aspect of matter that can be observed or measured without changing it. The Examples for
Physical properties would include: color, smell, freezing point, boiling point, melting point, etc.
While Chemical properies may only be observed by changing the chemical identity of a substance.
An example for Chemical properties would be rusting iron. Physical change rearranges molecules
but doesn't affect their internal structures. Examples of this change would be a substance can go
from a solid to a liquid, a liquid to a gas, a gas to a liquid, a liquid to a solid, and a solid to a gas.
Chemical change is any change that results in the formation of new ... Show more content on
Helpwriting.net ...
First lab. The burning of the strip of magnesium causes it to ignite a bright spark, leaving the burnt
remains in to white ash. The result is a CHEMICAL CHANGE. Because once you burn it, you
couldn't turn the white ash back to its original form. Second lab:. Third lab: when I mixed the
Sodium Hydroxide with water, the mixture change to the color pink. The result is a CHEMICAL
CHANGE. Because you couldn't change the pink color back to clear water before it was poured
with Sodium Hydroxide. Fourth Lab: When I mixed the Baking Soda with Vinegar, it fizzes up to
the top of the beaker. The result is a CHEMICAL CHANGE. Because the Baking Soda is already in
the Vinegar and you couldn't extract it out once it fizzes. Fifth Lab: the mixture of Baking Soda and
water resulted with a semi–greyish color within the beaker. The result is BOTH A CHEMICAL
AND PHYSICAL CHANGE. Because even though the mixture resulted to a different color, you
could evaporate it and bring back the baking soda as it was while the water itself extracted. Sixth
Lab: When I poured a bit of Vinegar to the beaker of milk, it quickly break up the milk into clumps
which produced a "sour" odor similar to spoiled milk. The result is a CHEMICAL CHANGE.
Because the Vinegar turned the milk into cheesy chunks and you couldn't turn it back to its original
liquid form. And the Seventh lab: After I mixed the drops of Potassium iodide and Lead Nitrate, its
color turned into neon green. The result is a CHEMICAL CHANGE. Because the mixture changed
into an unexpected color since the Potassium iodide has the color brown, and the Lead Nitrate is a
clear liquid, when mixed turned to neon green and you couldn't separate them back to normal. Now
for the Heat Curve Lab. During the 12 minutes of heating the beaker of water and ice while reading
the changes of its temperature of the thermometer sticking inside. It started out slow at first, but
until about four minutes later the

Types Of Enthalpy Changes In Chemical And Chemical Changes

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