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Lab 9: Chemical Reactions II
Pre-lab Questions
1. Michelangelo used fresco painting when he painted the
Sistine Chapel. Fresco painting involves most of the types of
chemical reactions you just studied. Listed below are some of
the reactions used in creating a Fresco painting. Identify the
type of chemical reaction used for each step and balance the
chemical equation if needed.
Initially, some sort of heat must be generated. Propane is an
example of a common fuel source used for heating.
C3H8 + O2 → CO2 + H2O
This is a ____________________________________________
reaction.
Next, quicklime (calcium oxide) is made by roasting calcium
carbonate (limestone).
CaCO3 → CaO + CO2
This is a ____________________________________________
reaction.
The quicklime is slaked to form lime plaster.
CaO + H2O → Ca(OH)2
This is a
____________________________________________reaction.
The lime plaster is cured or dried.
Ca(OH)2 + CO2 → Ca(OH)(HCO3)
This is a ____________________________________________
reaction.
This quickly continues to react to form calcium carbonate and
water.
Ca(OH)(HCO3) → CaCO3 + H2O
This is a ____________________________________________
reaction.
Frescos will deteriorate over time when exposed to the damp,
acidic environments typical of modern urban city atmospheres.
CaCO3 + H2SO4 → CaSO4 + H2O + CO2
This is a ____________________________________________
reaction.
2. Balance each of the chemical equa_ons you will be doing in
this laboratory exercise.
Combustion:
C4H10 (g) + O2 (g) → CO2 (g) + H2O(g)
Synthesis:
Hb (s) + O2 → HbO2 (s)
Single Replacement:
Zn (s) + H3C6H5O7 (aq) → Zn3(H3C6H5O7)2 (aq) + H2 (g)
Double Replacement:
Zn(C2H3O2)2 (aq) + Na3PO4 (aq) → NaC2H3O2 (aq) +
Zn3(PO4)2 (s)
Decomposition:
(NH4)2CO3 (s) → NH3 + H2O + CO2 (g)
Experiment: Getting to Know your Reactions
Procedure
**Take photographs of your experiment set up for Parts 1 - 5
and your results. Submit them with your laboratory report.**
Part 1: Combustion
C4H10 (g) + O2(g) → CO2 (g) + H2O (g)
1. Light a butane lighter and observe the flame. (The ignition of
the flame is a reaction between butane and the oxygen in the air
you breathe.)
2. Record your observations in the data table from when the
lighter is turned on until it is turned off.
Part 2: Synthesis (A + B → C)
Hb(s) + O2 → HbO2 (s)
1. Take a deep breath, hold it as long as possible and then
exhale. Visualize the reaction occurring.
2. Record your observations before inhaling and a>er you
exhale.
3. Construct an oxyhemoglobin molecule with modeling clay
and toothpicks.
Hint: See figure of molecule in introduction as a guide.
4. Take a photograph of your model and submit it with your
laboratory report.
Part 3: Single Replacement (A + BC → AC + B)
Zn (s) + H3C6H5O7 (aq) → Zn3(C6H5O7)2 (aq) + H2 (g)
1. Place a test tube in a test tube rack or small beaker.
2. Slightly tilt a test tube and slide a small zinc-coated
(galvanized) washer down the side.
3. Use a 10 mL graduated cylinder to measure out
approximately 2 mL of saturated citric acid and carefully pour it
into the test tube containing the zinc washer.
CAUTION: Citric acid is irritating to the eyes and skin.
4. Observe the reaction for several minutes, and record your
observations in the data table.
5. To clean up, separate the acid solution from the washer by
pouring it into a small beaker while leaving the washer in the
test tube. This is called decanting. Rinse the test tube
containing the washer several times with water and add each
rinse to the beaker.
CAUTION: Do not pour the acid directly down the drain. To
neutralize the acid, add small amounts of baking soda to the
solution in the beaker and stir with a stirring rod.
6. Continue stirring and adding small amounts of baking soda
until gas no longer forms. Pour the liquid down the drain and
throw the washer in the trash.
Part 4: Double Replacement (AB + CD → CB + AD)
Zn(C2H3O2)2 (aq) + Na3PO4 (aq) → NaC2H3O2 (aq) +
Zn3(PO4)2 (s)
1. Pour approximately 2 mL of 0.1 M zinc acetate
(Zn(C2H3O2)2) into a clean test tube.
2. Add approximately 2 mL of 0.1 M sodium phosphate tribasic
(Na3PO4) into the test tube.
3. Record your observations before and after the addition of
Na3PO4 in the data table.
4. To clean up, pour the contents of the test tube down the
drain.
Part 5: Decomposition (AB → A + B)
(NH4)2CO3 (s) → NH3 + H2O + CO2 (g)
1. Place a spatula tip full (approximately 0.02 g) of ammonium
carbonate (NH4)2CO3, powder into a test tube.
CAUTION: Do not inhale the strong ammonia odor. Try to work
in well-ventilated area.
2. Light the candle using the butane lighter.
CAUTION: Long hair should be tied up and loose clothing
restrained when around an open flame to prevent fire and burns.
Be sure you are wearing your safety goggles.
3. Use a test tube holder to hold the test tube containing the
ammonium carbonate at a slight angle in the candle flame. Keep
the open end of the tube pointed away from you and other
students. Continue to heat the sample until the reaction is
finished.
Hint: Remember the products of this reaction are all gases.
4. Record your observations in the Data section.
5. Allow the test tube to cool to room temperature before
touching it.
CAUTION: The test tube will be very hot and can burn your
skin if touched before it cools.
Hint: After the test tube has cooled for a few seconds, place it
in a small beaker or test tube rack to finish cooling.
6. Extinguish the candle. Wash out the test tube with soap and
water.
Data
Table 1: Reaction Observations, Parts 1-5
Substance
Before the Reaction
After the Reaction
Combustion
Synthesis
Single Replacement
Double Replacement
Decomposition
Post-lab Questions
1. Take photographs of your experiment set up for Parts 1-5,
including the oxyhemoglobin molecular model from Part 2:
Synthesis. Submit them with your laboratory report.
2. Write the combustion reaction that occurs when you cook out
on a propane gas grill. Propane has the chemical formula C3H8.
Make sure to balance the reaction equation.
3. Balance the following equations and identify the type of
reaction.
a. BaCl2 (s) + K2SO4 (aq) → BaSO4 (s) + KCl (aq)
b. KClO3 (s) → KCl (s) + O2(g)
c. H2 (g) + O2 (g) → H2O (l)
d. F2 (g) + LiCl (aq) → LiF (aq) + Cl2 (l)
©eScience Labs, 2013
Exercise #6 - Page 1 of 3
(E6) Exercise #6: Classifying Marine Life
Goals
The purpose of this exercise is to practice classification of
marine life in a variety of ways, including
taxonomic classification, classifcation by habitat and mobility,
and classificaiton by biozone. Further, you
will explore adaptations of specific marine organisms for life
in their environment .
The Data
For this exercise, we will be using the MarineBio.org species
database, and other online sources, to
examine marine life. MarineBio.org is a marine conservation
and science education organization with a
mission to educate readers about marine life and the marine
environment. We will be using the
organization’s Species Database to research several marine
organisms: http://marinebio.org/search/
Dolphin (Pacific White-sided dolphins)
In the search field of http://marinebio.org/search, enter the term
“Pacific white-sided dolphin”. Choose
the first entry for “Pacific white-sided dolphins”.
1. What is the taxonomic classification of Pacific
white-sided dolphins? You should report the
Kingdom, Phylum, Class, Order, Family, Genus and
Species.
2. Where (generally) are Pacific white-sided
dolphins found? (click the link under “World Range
and Habitat” called OBIS Distribution Map to see a
map of where these organisms are found)
3. What is the feeding behavior of the Pacific white-
sided dolphin?
4. Are Pacific white-sided dolphins considered plankton,
nekton, or benthos?
5. Are Pacific white-sided dolphins pelagic or benthic
organisms?
6. Based on your answer to the previous question, and Figure
12.25 on page 380 of your text, what
biozone(s) would we most likely find Pacific white-sided
dolphins? If you answered “benthic” to
question 5, choose from the benthic biozones. If you chose
“pelagic” for number 5, choose from the
pelagic zones.
Do some research online (use quality sources) to answer the
following question:
7. What are TWO adaptations of Pacific White-Sided dolphins
for living in their environment? See
Section 12.4 of your text for help with this, but make sure your
answer is specific to Pacific White-Sided
dolphins. Prepare your answer in complete sentences, in your
own words.
http://marinebio.org/search/
http://marinebio.org/search
Exercise #6 - Page 2 of 3
Sea Urchin (Red Sea Urchin)
In the search field of http://marinebio.org/search, enter the term
“Red Sea Urchin”. Choose the first entry
for “Red Sea Urchin”
8. What is the taxonomic classification of the Red Sea Urchin?
You should report the Kingdom, Phylum, Class, Order, Family,
Genus and Species.
9. Where (generally) are Red Sea Urchins found? (click the link
under “World Range and Habitat” called OBIS Distribution Map
to see a map of where these organisms are found)
10. What is the feeding behavior of the Red Sea Urchin?
11. Are Red Sea Urchins considered plankton, nekton, or
benthos?
12. Are Red Sea Urchins pelagic or benthic organisms?
13. Based on your answer to the previous question, and Figure
12.25 on page 380 of your text, what
biozone(s) would we most likely find Red Sea Urchins? If you
answered “benthic” to question 5,
choose from the benthic biozones. If you chose “pelagic” for
number 5, choose from the pelagic zones.
Do some research online (use quality sources) to answer the
following question:
14. What are TWO adaptations of Red Sea Urchins for living in
their environment? See Section 12.4 of
your text for help with this, but make sure your answer is
specific to Red Sea Urchins. Prepare your
answer in complete sentences, in your own words.
Moon Jellyfish
In the search field of http://marinebio.org/search, enter the term
“Moon Jellyfish”. Choose the first entry
for “Moon Jellyfish”
15. What is the taxonomic classification of the Moon Jellyfish?
You should report the Kingdom, Phylum, Class, Order, Family,
Genus and Species.
16. Where (generally) are Moon Jellyfish found? (click the link
under “World Range and Habitat” called OBIS Distribution Map
to see a map of where these organisms are found)
17. What is the feeding behavior of the Moon Jellyfish?
18. Are Moon Jellyfish considered plankton, nekton, or
benthos?
19. Are Moon Jellyfish pelagic or benthic organisms?
20. Based on your answer to the previous question, and Figure
12.25 on page 380 of your text, what
biozone(s) would we most likely find Moon Jellyfish? If you
answered “benthic” to question 5, choose
from the benthic biozones. If you chose “pelagic” for number 5,
choose from the pelagic zones.
Do some research online (use quality sources) to answer the
following questions:
21. What are TWO adaptations of Moon Jellyfish for living in
their environment? See Section 12.4 of
your text for help with this, but make sure your answer is
specific to Moon Jellyfiss. Prepare your answer
in complete sentences, in your own words.
http://marinebio.org/search
http://marinebio.org/search
Exercise #6 - Page 3 of 3
EXTRA CREDIT: Emiliania huxeyi
To the right, you see a microscope image of an organism of the
genus and species: Emiliania huxleyi. I
would like you to try to learn more about this species. Do some
research online and answer the following
questions about Emiliania huxleyi. (NOTE: The
marinebio.org site does NOT have information on this
organism – you will have to research quality sources
to determine the answer to these questions.
22. What is the common name of Emiliania
huxleyi? (1 point)
23. Is Emiliania huxleyi considered plankton,
nekton, or benthos? (1 point)
24. In what biozone would we most likely find
Emiliania huxleyi? (use Figure 12.25 to help
you)(1 point)
25. What is the importance of Emiliania huxleyi in
the oceanic ecosystem? (2 points) Prepare
your answer in complete sentences, in your own words.
Submitting your answers
You will submit your answers to this exercise in a Quiz called
(E6) Exercise #6 Quiz. Here are a few
details on the quiz:
you open it. COMPLETE THE EXERCISE
QUESTIONS BEFORE OPENING THE QUIZ!
ing the questions with a
paragraph response. You will be answering
all of the questions in the Quizzes tool.
o You will enter your answers to questions 1-6, 8-13, 15-20,
and 22-24 by choosing the answer
that most closely matches your own from a list of choices.
o You will enter your answers to questions 7, 14, 21, and 25 as
short answer responses.
Your instructor will manually grade parts of this quiz. You may
not see a score immediately. Once your
instructor finishes grading this exercise you will receive a
notification advising you that feedback is ready
to view.
Lab 8: Chemical Reactions I
Pre-lab Questions
1. Name the chemical that makes up teeth.
2. How does plaque harm teeth?
3. How does fluoride promote dental health?
4. Write two solubility rules that are used in this lab.
Experiment: Battle of the Mouth Rinses
Some mouth rinses contain fluoride, usually in the form of
sodium fluoride, which is soluble in water. In this lab, you will
determine which one of two mouth rinses would be better at
preventing cavities by replacing lost minerals with fluoride.
You will do this by determining which rinse contains fluoride.
Procedure
**Take photographs of your experiment set up and your results.
Submit them with your laboratory report.**
1. Label the two test tubes with a permanent marker as A and B.
HINT: Make sure to write down which rinse is A and which is
B.
2. Pour 10 mL of Rinse A into the test tube marked A.
3. Pour 10 mL of Rinse B into the test tube marked B.
HINT: If using the same graduated cylinder to measure your
rinses, wash the cylinders WELL between pours to prevent
cross-contamination.
4. Pour 3 mL of 1 M Ca(C2H3O2)2 solution into each of the test
tubes. Gently stir each test tube with a stir rod to mix. Be sure
to clean your stir rod each time before placing it in a solution.
CAUTION: Mixing should be done gently to prevent glass
breakage and injury.
5. Observe and record initial observations immediately after
adding calcium acetate to the test tubes.
6. Observe the reactions for at least 10 minutes to ensure it is
finished. HINT: A positive test is indicated by a cloudy
appearance of the solution. The precipitate formed can be more
easily seen if the test tube is held up to the light. The
precipitate will eventually settle to the bottom of the test tube.
7. Let the test tubes sit for an hour. After an hour, record final
observations.
8. Record all observations in the Data section.
9. To clean up, you can rinse the small amount of precipitate
down the drain.
Data
· Observations of NaF and Ca(C2H3O2)2 (see sequence of
pictures below)
· Observations of Rinse A and Ca(C2H3O2)2
· Observations of Rinse B and Ca(C2H3O2)2
Post-lab Questions
1. Take photographs of your experiment set up and your results.
Submit them with your laboratory report.
2. Did either of the mouth rinses contain fluoride? How did you
know?
3. Which mouth rinse would be better at fighting cavities?
Why?
4. Based on the solubility rules learned in this lab, could you
use potassium nitrate to test for fluoride in mouth rinses?
Explain your answer.
©eScience Labs, 2013
Lab 7: Polar Bonding
Pre-lab Questions
1. What two conditions are considered when determining
whether a molecule is polar or non-polar?
2. What determines if a bond is polar?
3. List several examples of polar molecules.
4. List several examples of non-polar molecules.
5. What is the rule when using polar and non-polar solvents?
Experiment: Slime Time
Some inks are polar while others are non‐polar. A polar solvent
will pick up polar inks, while a non‐polar solvent will pick up
non‐polar inks. In this lab you will use inks to identify slime
and silly putty as polar or non‐polar. You will also use paper
chromatography to verify the inks are correctly identified as
polar or non‐polar.
Procedure
**Take photographs of your experiment for Parts 1, 2, and 3;
and your results. Submit them with your laboratory report.**
Part 1: Making Slime
1. Weigh out 0.5 g of guar gum into a 250 mL beaker.
2. Measure 50.0 mL of distilled water into a 100 mL graduated
cylinder and pour it into the 250 mL beaker that contains the
guar gum.
3. Rapidly stir the mixture with a stirring rod for at least 3
minutes and until the guar gum is dissolved.
4. Measure 4.00 mL of a 4% Borax solution into a 10 mL
graduated cylinder and add it to the guar gum and water.
5. Stir the solution until it becomes slime. This will take a few
minutes. If the slime remains too runny, add an additional 1.0
mL of the 4.0% Borax solution and continue to stir until the
slime is the right consistency.
6. Once you are satisfied with the slime, pour it into your
hands. Be sure not to drop any of it on to the floor.
7. Manipulate the slime in your hands. Write down observations
made about how slime pours, stretches, breaks, etc.
CAUTION: Slime is slippery and if dropped it can make the
work area slick.
8. Place the slime back into the beaker and WASH YOUR
HANDS.
Part 2: Slime and Putty Ink Tests
1. On a piece of notebook paper make one 20-25 mm long mark
of each of the inks you are testing. Space the marks at least one
inch apart. Use a pencil to label each mark with its description.
a. Water soluble inks include those in highlighters and certain
pens.
b. Water insoluble inks include those in permanent
pens/markers, newsprint, and a dry-erase markers.
2. While the inks are drying, select a passage or a picture in the
newspaper to test with the slime.
3. Break off a small piece of slime that is 3 - 5 cm in diameter.
Gently place this piece on top of the newspaper print, and then
carefully pick it up again.
4. Observe and record in Table 1 whether or not the ink was
picked up onto the slime.
5. Break off another small piece of slime. Once the inks from
Step 1 have dried, gently place the slime on top of the first spot
on the notebook paper, and then carefully pick it up. Repeat this
for each of the inks. Observe and record which inks were picked
up (dissolved) by the slime in Table 1.
6. Repeat this ink testing two more times for accuracy.
7. Before performing ink tests on silly putty, in the Data
section, hypothesize which inks the silly putty will pick up.
8. Perform ink tests on silly putty in the same manner as above.
Record your results in Table 2
Part 3: Chromatography of Ink Samples
1. Use a pencil or scissors to poke a small hole in the center of
a piece of filter paper (see Figure 4).
2. Spot the filter paper evenly spaced approximately 2 cm from
the small hole with the two insoluble inks and the two soluble
inks that were used in Part 2.
3. Obtain a ½ piece of filter paper. Fold the paper in half
several times so that it makes a narrow wick.
4. Insert the wick into the hole of the spotted paper so that it is
above the top of the filter paper by approximately 2 cm.
5. Fill a 250 mL beaker 3/4 full with water.
6. Set the filter paper on top of the beaker so that the bottom of
the wick is in the water. The paper should hang over the edge
of the beaker with the spotted side up.
7. Allow water to travel until it is approximately 1 cm from the
edge of the filter paper. Remove the filter paper from the
beaker.
8. Observe which inks moved from where they were originally
spotted. Record your observations in Part 3 of the Data section.
Data
Part 1
· Slime Observations:
Part 2
Table 1: Results of Ink Testing for Slime
Name of Ink
Picked up (dissolved)
Did not pick up
Test 1
Test 2
Test 3
Test 1
Test 2
Test 3
Newsprint
Highlighter
Roller ball pen
Sharpie marker
Dry-erase marker
· Hypothesis for Silly Putty (Procedure Part 2, Step 7):
Table 2: Results of Ink Testing for Silly Putty
Name of Ink
Picked up (dissolved)
Did not pick up
Test 1
Test 2
Test 3
Test 1
Test 2
Test 3
Newsprint
Highlighter
Roller ball pen
Sharpie marker
Dry-erase marker
Part 3
· Observations of inks following chromatography:
Post-lab Questions
1. Take photographs of your experimental set up for Parts 1, 2,
and 3 and your results. Submit them with your laboratory
report.
2. Did the slime pick up water soluble or water insoluble inks?
From these results, what can you conclude about the polarity of
slime molecules?
3. Explain how you determined your hypothesis about whether
or not silly putty would pick up water. Was your hypothesis
correct?
4. Were the inks you used properly classified as soluble and
insoluble? Use evidence from your results to explain your
answer.
© eScience Labs, 2013

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Lab 9 Chemical Reactions IIPre-lab Questions1. Michelangelo u.docx

  • 1. Lab 9: Chemical Reactions II Pre-lab Questions 1. Michelangelo used fresco painting when he painted the Sistine Chapel. Fresco painting involves most of the types of chemical reactions you just studied. Listed below are some of the reactions used in creating a Fresco painting. Identify the type of chemical reaction used for each step and balance the chemical equation if needed. Initially, some sort of heat must be generated. Propane is an example of a common fuel source used for heating. C3H8 + O2 → CO2 + H2O This is a ____________________________________________ reaction. Next, quicklime (calcium oxide) is made by roasting calcium carbonate (limestone). CaCO3 → CaO + CO2 This is a ____________________________________________ reaction. The quicklime is slaked to form lime plaster. CaO + H2O → Ca(OH)2 This is a ____________________________________________reaction. The lime plaster is cured or dried. Ca(OH)2 + CO2 → Ca(OH)(HCO3) This is a ____________________________________________ reaction. This quickly continues to react to form calcium carbonate and water. Ca(OH)(HCO3) → CaCO3 + H2O
  • 2. This is a ____________________________________________ reaction. Frescos will deteriorate over time when exposed to the damp, acidic environments typical of modern urban city atmospheres. CaCO3 + H2SO4 → CaSO4 + H2O + CO2 This is a ____________________________________________ reaction. 2. Balance each of the chemical equa_ons you will be doing in this laboratory exercise. Combustion: C4H10 (g) + O2 (g) → CO2 (g) + H2O(g) Synthesis: Hb (s) + O2 → HbO2 (s) Single Replacement: Zn (s) + H3C6H5O7 (aq) → Zn3(H3C6H5O7)2 (aq) + H2 (g) Double Replacement: Zn(C2H3O2)2 (aq) + Na3PO4 (aq) → NaC2H3O2 (aq) + Zn3(PO4)2 (s) Decomposition: (NH4)2CO3 (s) → NH3 + H2O + CO2 (g)
  • 3. Experiment: Getting to Know your Reactions Procedure **Take photographs of your experiment set up for Parts 1 - 5 and your results. Submit them with your laboratory report.** Part 1: Combustion C4H10 (g) + O2(g) → CO2 (g) + H2O (g) 1. Light a butane lighter and observe the flame. (The ignition of the flame is a reaction between butane and the oxygen in the air you breathe.) 2. Record your observations in the data table from when the lighter is turned on until it is turned off. Part 2: Synthesis (A + B → C) Hb(s) + O2 → HbO2 (s) 1. Take a deep breath, hold it as long as possible and then exhale. Visualize the reaction occurring. 2. Record your observations before inhaling and a>er you exhale. 3. Construct an oxyhemoglobin molecule with modeling clay and toothpicks. Hint: See figure of molecule in introduction as a guide. 4. Take a photograph of your model and submit it with your laboratory report. Part 3: Single Replacement (A + BC → AC + B) Zn (s) + H3C6H5O7 (aq) → Zn3(C6H5O7)2 (aq) + H2 (g) 1. Place a test tube in a test tube rack or small beaker. 2. Slightly tilt a test tube and slide a small zinc-coated (galvanized) washer down the side. 3. Use a 10 mL graduated cylinder to measure out approximately 2 mL of saturated citric acid and carefully pour it into the test tube containing the zinc washer. CAUTION: Citric acid is irritating to the eyes and skin.
  • 4. 4. Observe the reaction for several minutes, and record your observations in the data table. 5. To clean up, separate the acid solution from the washer by pouring it into a small beaker while leaving the washer in the test tube. This is called decanting. Rinse the test tube containing the washer several times with water and add each rinse to the beaker. CAUTION: Do not pour the acid directly down the drain. To neutralize the acid, add small amounts of baking soda to the solution in the beaker and stir with a stirring rod. 6. Continue stirring and adding small amounts of baking soda until gas no longer forms. Pour the liquid down the drain and throw the washer in the trash. Part 4: Double Replacement (AB + CD → CB + AD) Zn(C2H3O2)2 (aq) + Na3PO4 (aq) → NaC2H3O2 (aq) + Zn3(PO4)2 (s) 1. Pour approximately 2 mL of 0.1 M zinc acetate (Zn(C2H3O2)2) into a clean test tube. 2. Add approximately 2 mL of 0.1 M sodium phosphate tribasic (Na3PO4) into the test tube. 3. Record your observations before and after the addition of Na3PO4 in the data table. 4. To clean up, pour the contents of the test tube down the drain. Part 5: Decomposition (AB → A + B) (NH4)2CO3 (s) → NH3 + H2O + CO2 (g) 1. Place a spatula tip full (approximately 0.02 g) of ammonium carbonate (NH4)2CO3, powder into a test tube. CAUTION: Do not inhale the strong ammonia odor. Try to work in well-ventilated area. 2. Light the candle using the butane lighter. CAUTION: Long hair should be tied up and loose clothing restrained when around an open flame to prevent fire and burns. Be sure you are wearing your safety goggles.
  • 5. 3. Use a test tube holder to hold the test tube containing the ammonium carbonate at a slight angle in the candle flame. Keep the open end of the tube pointed away from you and other students. Continue to heat the sample until the reaction is finished. Hint: Remember the products of this reaction are all gases. 4. Record your observations in the Data section. 5. Allow the test tube to cool to room temperature before touching it. CAUTION: The test tube will be very hot and can burn your skin if touched before it cools. Hint: After the test tube has cooled for a few seconds, place it in a small beaker or test tube rack to finish cooling. 6. Extinguish the candle. Wash out the test tube with soap and water. Data Table 1: Reaction Observations, Parts 1-5 Substance Before the Reaction After the Reaction Combustion Synthesis Single Replacement Double Replacement Decomposition
  • 6. Post-lab Questions 1. Take photographs of your experiment set up for Parts 1-5, including the oxyhemoglobin molecular model from Part 2: Synthesis. Submit them with your laboratory report. 2. Write the combustion reaction that occurs when you cook out on a propane gas grill. Propane has the chemical formula C3H8. Make sure to balance the reaction equation. 3. Balance the following equations and identify the type of reaction. a. BaCl2 (s) + K2SO4 (aq) → BaSO4 (s) + KCl (aq) b. KClO3 (s) → KCl (s) + O2(g) c. H2 (g) + O2 (g) → H2O (l) d. F2 (g) + LiCl (aq) → LiF (aq) + Cl2 (l) ©eScience Labs, 2013 Exercise #6 - Page 1 of 3
  • 7. (E6) Exercise #6: Classifying Marine Life Goals The purpose of this exercise is to practice classification of marine life in a variety of ways, including taxonomic classification, classifcation by habitat and mobility, and classificaiton by biozone. Further, you will explore adaptations of specific marine organisms for life in their environment . The Data For this exercise, we will be using the MarineBio.org species database, and other online sources, to examine marine life. MarineBio.org is a marine conservation and science education organization with a mission to educate readers about marine life and the marine environment. We will be using the organization’s Species Database to research several marine organisms: http://marinebio.org/search/ Dolphin (Pacific White-sided dolphins) In the search field of http://marinebio.org/search, enter the term “Pacific white-sided dolphin”. Choose the first entry for “Pacific white-sided dolphins”. 1. What is the taxonomic classification of Pacific white-sided dolphins? You should report the
  • 8. Kingdom, Phylum, Class, Order, Family, Genus and Species. 2. Where (generally) are Pacific white-sided dolphins found? (click the link under “World Range and Habitat” called OBIS Distribution Map to see a map of where these organisms are found) 3. What is the feeding behavior of the Pacific white- sided dolphin? 4. Are Pacific white-sided dolphins considered plankton, nekton, or benthos? 5. Are Pacific white-sided dolphins pelagic or benthic organisms? 6. Based on your answer to the previous question, and Figure 12.25 on page 380 of your text, what biozone(s) would we most likely find Pacific white-sided dolphins? If you answered “benthic” to question 5, choose from the benthic biozones. If you chose “pelagic” for number 5, choose from the pelagic zones. Do some research online (use quality sources) to answer the following question: 7. What are TWO adaptations of Pacific White-Sided dolphins for living in their environment? See Section 12.4 of your text for help with this, but make sure your answer is specific to Pacific White-Sided dolphins. Prepare your answer in complete sentences, in your own words.
  • 9. http://marinebio.org/search/ http://marinebio.org/search Exercise #6 - Page 2 of 3 Sea Urchin (Red Sea Urchin) In the search field of http://marinebio.org/search, enter the term “Red Sea Urchin”. Choose the first entry for “Red Sea Urchin” 8. What is the taxonomic classification of the Red Sea Urchin? You should report the Kingdom, Phylum, Class, Order, Family, Genus and Species. 9. Where (generally) are Red Sea Urchins found? (click the link under “World Range and Habitat” called OBIS Distribution Map to see a map of where these organisms are found) 10. What is the feeding behavior of the Red Sea Urchin? 11. Are Red Sea Urchins considered plankton, nekton, or benthos? 12. Are Red Sea Urchins pelagic or benthic organisms? 13. Based on your answer to the previous question, and Figure 12.25 on page 380 of your text, what biozone(s) would we most likely find Red Sea Urchins? If you answered “benthic” to question 5, choose from the benthic biozones. If you chose “pelagic” for number 5, choose from the pelagic zones.
  • 10. Do some research online (use quality sources) to answer the following question: 14. What are TWO adaptations of Red Sea Urchins for living in their environment? See Section 12.4 of your text for help with this, but make sure your answer is specific to Red Sea Urchins. Prepare your answer in complete sentences, in your own words. Moon Jellyfish In the search field of http://marinebio.org/search, enter the term “Moon Jellyfish”. Choose the first entry for “Moon Jellyfish” 15. What is the taxonomic classification of the Moon Jellyfish? You should report the Kingdom, Phylum, Class, Order, Family, Genus and Species. 16. Where (generally) are Moon Jellyfish found? (click the link under “World Range and Habitat” called OBIS Distribution Map to see a map of where these organisms are found) 17. What is the feeding behavior of the Moon Jellyfish? 18. Are Moon Jellyfish considered plankton, nekton, or benthos? 19. Are Moon Jellyfish pelagic or benthic organisms? 20. Based on your answer to the previous question, and Figure 12.25 on page 380 of your text, what biozone(s) would we most likely find Moon Jellyfish? If you answered “benthic” to question 5, choose from the benthic biozones. If you chose “pelagic” for number 5, choose from the pelagic zones.
  • 11. Do some research online (use quality sources) to answer the following questions: 21. What are TWO adaptations of Moon Jellyfish for living in their environment? See Section 12.4 of your text for help with this, but make sure your answer is specific to Moon Jellyfiss. Prepare your answer in complete sentences, in your own words. http://marinebio.org/search http://marinebio.org/search Exercise #6 - Page 3 of 3 EXTRA CREDIT: Emiliania huxeyi To the right, you see a microscope image of an organism of the genus and species: Emiliania huxleyi. I would like you to try to learn more about this species. Do some research online and answer the following questions about Emiliania huxleyi. (NOTE: The marinebio.org site does NOT have information on this organism – you will have to research quality sources to determine the answer to these questions. 22. What is the common name of Emiliania huxleyi? (1 point) 23. Is Emiliania huxleyi considered plankton, nekton, or benthos? (1 point) 24. In what biozone would we most likely find Emiliania huxleyi? (use Figure 12.25 to help
  • 12. you)(1 point) 25. What is the importance of Emiliania huxleyi in the oceanic ecosystem? (2 points) Prepare your answer in complete sentences, in your own words. Submitting your answers You will submit your answers to this exercise in a Quiz called (E6) Exercise #6 Quiz. Here are a few details on the quiz: you open it. COMPLETE THE EXERCISE QUESTIONS BEFORE OPENING THE QUIZ! ing the questions with a paragraph response. You will be answering all of the questions in the Quizzes tool. o You will enter your answers to questions 1-6, 8-13, 15-20, and 22-24 by choosing the answer that most closely matches your own from a list of choices. o You will enter your answers to questions 7, 14, 21, and 25 as short answer responses. Your instructor will manually grade parts of this quiz. You may not see a score immediately. Once your instructor finishes grading this exercise you will receive a
  • 13. notification advising you that feedback is ready to view. Lab 8: Chemical Reactions I Pre-lab Questions 1. Name the chemical that makes up teeth. 2. How does plaque harm teeth? 3. How does fluoride promote dental health? 4. Write two solubility rules that are used in this lab. Experiment: Battle of the Mouth Rinses Some mouth rinses contain fluoride, usually in the form of sodium fluoride, which is soluble in water. In this lab, you will determine which one of two mouth rinses would be better at preventing cavities by replacing lost minerals with fluoride. You will do this by determining which rinse contains fluoride. Procedure **Take photographs of your experiment set up and your results.
  • 14. Submit them with your laboratory report.** 1. Label the two test tubes with a permanent marker as A and B. HINT: Make sure to write down which rinse is A and which is B. 2. Pour 10 mL of Rinse A into the test tube marked A. 3. Pour 10 mL of Rinse B into the test tube marked B. HINT: If using the same graduated cylinder to measure your rinses, wash the cylinders WELL between pours to prevent cross-contamination. 4. Pour 3 mL of 1 M Ca(C2H3O2)2 solution into each of the test tubes. Gently stir each test tube with a stir rod to mix. Be sure to clean your stir rod each time before placing it in a solution. CAUTION: Mixing should be done gently to prevent glass breakage and injury. 5. Observe and record initial observations immediately after adding calcium acetate to the test tubes. 6. Observe the reactions for at least 10 minutes to ensure it is finished. HINT: A positive test is indicated by a cloudy appearance of the solution. The precipitate formed can be more easily seen if the test tube is held up to the light. The precipitate will eventually settle to the bottom of the test tube. 7. Let the test tubes sit for an hour. After an hour, record final observations. 8. Record all observations in the Data section. 9. To clean up, you can rinse the small amount of precipitate down the drain. Data · Observations of NaF and Ca(C2H3O2)2 (see sequence of pictures below) · Observations of Rinse A and Ca(C2H3O2)2
  • 15. · Observations of Rinse B and Ca(C2H3O2)2 Post-lab Questions 1. Take photographs of your experiment set up and your results. Submit them with your laboratory report. 2. Did either of the mouth rinses contain fluoride? How did you know? 3. Which mouth rinse would be better at fighting cavities? Why? 4. Based on the solubility rules learned in this lab, could you use potassium nitrate to test for fluoride in mouth rinses? Explain your answer. ©eScience Labs, 2013 Lab 7: Polar Bonding Pre-lab Questions 1. What two conditions are considered when determining whether a molecule is polar or non-polar?
  • 16. 2. What determines if a bond is polar? 3. List several examples of polar molecules. 4. List several examples of non-polar molecules. 5. What is the rule when using polar and non-polar solvents? Experiment: Slime Time Some inks are polar while others are non‐polar. A polar solvent will pick up polar inks, while a non‐polar solvent will pick up non‐polar inks. In this lab you will use inks to identify slime and silly putty as polar or non‐polar. You will also use paper chromatography to verify the inks are correctly identified as polar or non‐polar. Procedure **Take photographs of your experiment for Parts 1, 2, and 3; and your results. Submit them with your laboratory report.** Part 1: Making Slime 1. Weigh out 0.5 g of guar gum into a 250 mL beaker. 2. Measure 50.0 mL of distilled water into a 100 mL graduated cylinder and pour it into the 250 mL beaker that contains the
  • 17. guar gum. 3. Rapidly stir the mixture with a stirring rod for at least 3 minutes and until the guar gum is dissolved. 4. Measure 4.00 mL of a 4% Borax solution into a 10 mL graduated cylinder and add it to the guar gum and water. 5. Stir the solution until it becomes slime. This will take a few minutes. If the slime remains too runny, add an additional 1.0 mL of the 4.0% Borax solution and continue to stir until the slime is the right consistency. 6. Once you are satisfied with the slime, pour it into your hands. Be sure not to drop any of it on to the floor. 7. Manipulate the slime in your hands. Write down observations made about how slime pours, stretches, breaks, etc. CAUTION: Slime is slippery and if dropped it can make the work area slick. 8. Place the slime back into the beaker and WASH YOUR HANDS. Part 2: Slime and Putty Ink Tests 1. On a piece of notebook paper make one 20-25 mm long mark of each of the inks you are testing. Space the marks at least one inch apart. Use a pencil to label each mark with its description. a. Water soluble inks include those in highlighters and certain pens. b. Water insoluble inks include those in permanent pens/markers, newsprint, and a dry-erase markers. 2. While the inks are drying, select a passage or a picture in the newspaper to test with the slime. 3. Break off a small piece of slime that is 3 - 5 cm in diameter. Gently place this piece on top of the newspaper print, and then carefully pick it up again. 4. Observe and record in Table 1 whether or not the ink was picked up onto the slime. 5. Break off another small piece of slime. Once the inks from Step 1 have dried, gently place the slime on top of the first spot on the notebook paper, and then carefully pick it up. Repeat this
  • 18. for each of the inks. Observe and record which inks were picked up (dissolved) by the slime in Table 1. 6. Repeat this ink testing two more times for accuracy. 7. Before performing ink tests on silly putty, in the Data section, hypothesize which inks the silly putty will pick up. 8. Perform ink tests on silly putty in the same manner as above. Record your results in Table 2 Part 3: Chromatography of Ink Samples 1. Use a pencil or scissors to poke a small hole in the center of a piece of filter paper (see Figure 4). 2. Spot the filter paper evenly spaced approximately 2 cm from the small hole with the two insoluble inks and the two soluble inks that were used in Part 2. 3. Obtain a ½ piece of filter paper. Fold the paper in half several times so that it makes a narrow wick. 4. Insert the wick into the hole of the spotted paper so that it is above the top of the filter paper by approximately 2 cm. 5. Fill a 250 mL beaker 3/4 full with water. 6. Set the filter paper on top of the beaker so that the bottom of the wick is in the water. The paper should hang over the edge of the beaker with the spotted side up. 7. Allow water to travel until it is approximately 1 cm from the edge of the filter paper. Remove the filter paper from the beaker. 8. Observe which inks moved from where they were originally spotted. Record your observations in Part 3 of the Data section. Data Part 1 · Slime Observations:
  • 19. Part 2 Table 1: Results of Ink Testing for Slime Name of Ink Picked up (dissolved) Did not pick up Test 1 Test 2 Test 3 Test 1 Test 2 Test 3 Newsprint Highlighter
  • 20. Roller ball pen Sharpie marker Dry-erase marker · Hypothesis for Silly Putty (Procedure Part 2, Step 7): Table 2: Results of Ink Testing for Silly Putty Name of Ink Picked up (dissolved) Did not pick up Test 1 Test 2 Test 3 Test 1 Test 2 Test 3
  • 22. Part 3 · Observations of inks following chromatography: Post-lab Questions 1. Take photographs of your experimental set up for Parts 1, 2, and 3 and your results. Submit them with your laboratory report. 2. Did the slime pick up water soluble or water insoluble inks? From these results, what can you conclude about the polarity of slime molecules? 3. Explain how you determined your hypothesis about whether or not silly putty would pick up water. Was your hypothesis correct? 4. Were the inks you used properly classified as soluble and insoluble? Use evidence from your results to explain your answer. © eScience Labs, 2013