Chemical Change In Matter

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
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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

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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 вЃ° 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 20вЃ°c, 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

Chemical Change Lab Report
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

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
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F1Kl and Pb(NO3)2mustard, cloudy lookno change when on white or black paper
G1NaOH and phenolphthaleinviolet colorno change on white, but deeper violet on black paper
H1HCl and phenolphthaleinfaint white cloudy lookcolor was more visible when on the black paper over the white
A3NaOH and AgNO3brown muddy color, thickerno change when on white or black paper
B3AgNO3 and NH3no change until the lightno paper change, however when under the light for a minute it began turning a orange brown color
C3NH3 and CuSO4aqua and cloudy lookingno change in color over papers noticed, if any small.
Data Table 2 – Observations of Chemical Changes, using chemicals in house with BTB
Well #Chemicals UsedReactionPaper Change
D3Cleaner w/bleach and BTBstarted as a blue, then turned pale yellowno change noticed
E3Multi–surface cleaner and BTBBlue with bubblescould see bubbles a little better when on the black paper
F3Mr. Clean Antibacterial and BTBRoyal Bluea 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

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.

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

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 Helpwriting.net ...
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

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.
п‚®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+HClп‚®NaCl+H2O+CO2
f. NaOCl+KIп‚®NaCl+KIO3
g. 2KI+Pb(NO3)2п‚®PbI2+2KNO3
j.

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 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
ReactionBefore: Clear + Yellow After: Gold Word Equation:Potassium Iodide + Lead Nitrate в†’ Potassium Nitrate + Lead Iodine Skelton Equation:KI
+ Pb(NO3)2 в†’ K(NO3)2 + PbI Balanced Chemical Equation:2KI + Pb(NO3)2 в†’ 2 K(NO3) + PbI Reaction Type:Double Displacement < Figure

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

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

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

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 elementsВЎВ¦ 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
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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 SubstanceObservationsWas there a
chemical change? 10.1M cobalt (II) chloride hexahydrate 95% ethanolProduct turned deep blue in color yet remained clear of precipitate.Yes. 20.1M
cobalt (II) chloride hexahydrate dissolved in 95% ethanol WaterProduct turned medium pink in color yet remained clear of precipitate.Yes. 3Zinc 1M
hydrochloric acid solutionProduct bubbled upon addition to the hydrochloric acid; liquid turned cloudy ВЎV precipitate was present; zinc sample
disintegrated slowly and turned black in color.Yes. 4Zinc 0.1M copper (II) sulfate solutionNo vigorous reaction occurred; rather, the zinc sample
disintegrated slowly and turned red in color.Yes. 50.1M copper (II) sulfate solution 1M hydrochloric acid solutionNo reaction occurred.No. 60.1M
copper (II) sulfate solution 0.5M sodium hydrogen carbonate solutionHeavy precipitate emerged immediately and solution turned white in color;
solution then became opaque and turned light, bright blue in color.Yes. 70.1M copper (II) sulfate solution 1M ammonia solutionMedium 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
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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.

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 Helpwriting.net ...
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 AgNOв‚ѓ 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 CuSOв‚„ в‹… 5Hв‚‚O was a physical change because the particles were only made smaller and nothing else changed.
Heating CuSOв‚„ в‹… 5Hв‚‚O 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

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 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 О”H in units of Joules. In a
chart, we recorded the total mass of our mixture and determined the number of moles

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

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

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:
ReactantsPredictions Before
CombiningObservations After
Combinin g
Starch + I2It becomes purpleIt becomes blue and a little purple.
Food coloring + NaOClThe 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 + CH3COOHThe color will be the same as the food coloringThe color becomes to the food coloring color.
Food coloring + NaOCl
+ CH3COOHIt will have foam and the food coloring color.It has foam in the color of the food coloring.
Red cabbage + NH3It 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

Lab Report Chemical Change
Purpose: The purpose of this lab is to observe the chemical changes of multiple single replacement reaction. Materials: ChemicalsLaboratory Tools
ZincChemplate MagnesiumGoggles CopperToothpicks 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 в†’ 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 + CuSo4в†’ 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 в†’ 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

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: ForcepsBunsen burnerFunnel Wire gauzeCrucible tongsFilter paper Test tubes, large and small Universal clampTest tube rack Stirring
rodRing stand and ring Materials: Nichrome metalMagnesium metalWooden splintsSodium chloride solution, NaCl, 0.1 M Hydrochloric acid, HCl,
3MSilver nitrate solution, AgNO3, 0.1M Steel woolSodium 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

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 lightgreen| 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.

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

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. Thetemperature 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 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

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 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#/questionsChemicalsReactions
ANaHCO
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

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

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

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.

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,

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

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
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

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

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

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 В°C Initial iron strip mass: 0.472 g Highest temperature observed: 28.5 В°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 в–Ў(в†’в”ґ ) гЂ–2MgOгЂ—_((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 0в–Ў(в†’в”ґ ) MgгЂ–(OH)гЂ—_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

Chemical Change In Matter

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