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Always wear safety goggles, a lab apron, and gloves Dispose of chemical wastes as directed by your teacher Broken glassware can easily puncture or slice skin Tincture of iodine may be a tissue irritant Iodine is toxic 6 Using a test-tube holder, return the test tubes to
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Pre-Lab
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1 Explain how a saturated fat, an unsaturated fat,
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1 Affix labels to nine test tubes Place your name on 2 3
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each label and number the test tubes 1 through 9 Test tube 1 is a control Add 1 mL of water to this test tube As detailed in Data Table 1, add 1 mL of each specified fat or oil to each of the remaining eight test tubes Heat all tubes in a hot water bath until the solid fats melt Add 3 drops of tincture of iodine to each test tube Using a stirring rod, stir the contents of each test tube to evenly distribute the iodine Clean the stirring rod between each tube
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1 Dispose of chemicals as instructed by your
teacher 2 Return all lab equipment to its proper place 3 Report any broken or damaged equipment 4 Wash your hands thoroughly before leaving the lab
Chemistry: Matter and Change 24
Laboratory Manual
Copyright Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc
and a polyunsaturated fat are different 2 What are two main differences between a fat and an oil 3 Write an equation to show iodine reacting with an unsaturated hydrocarbon 4 Read over the entire activity Form a hypothesis about how a change in color of a halogen can be used to predict the degree of saturation of a fatty acid Record your hypothesis in the next column
the rack and begin observing the color changes at 1-minute intervals for 3 minutes In Data Table 1, record your observations using this code: 0 no fading of iodine color; 1 some fading of iodine color; and 2 color of iodine completely gone 7 Determine the degree of unsaturation based on the color changes Use an arbitrary scale of 1 to 3, where 3 is the most unsaturated
Name
Date
Class
LAB 242
LABORATORY MANUAL
Data and Observations
Data Table 1
Test-tube number 1 2 3 4 5 6 7 8 9 Color after 1 min (0 2) Color after 2 min (0 2) Color after 3 min (0 2) Degree of unsaturation (1 3)
Material tested control olive oil coconut oil corn oil cottonseed oil soybean oil linseed oil melted butter melted vegetable shortening
Analyze and Conclude
1 Observing and Inferring Which fats or oils showed a lesser fading of the iodine color
Copyright Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc
2 Observing and Inferring Which fats or oils showed a greater fading of the iodine color
3 Observing and Inferring What does the different degree of fading of the iodine color
indicate about the bond patterns of the substances tested
4 Observing and Inferring What type of bond pattern results in the greatest degree of
color change of the iodine
5 Thinking Critically What was the function of test tube 1
Laboratory Manual
Chemistry: Matter and Change 24
Name
Date
Class
LAB 242
LABORATORY MANUAL
6 Drawing a Conclusion Do animal fats or vegetable oils generally contain the greater
amount of saturated fat
7 Drawing a Conclusion Why were observations made after 1, 2 and 3 minutes, respectively
8 Error Analysis What possible sources of error may account for inaccurate results
Real-World Chemistry
1 Hydrogenation is the process of adding hydro2 Fats and oils react with oxygen from the air
gen to vegetable oils to make them solid Explain what happens to the carbon-carbon bonds in the oils when the hydrogen is added
and produce aldehydes and acids that have unpleasant odors and tastes Where in the fat molecules is the oxidation most likely to take place
Chemistry: Matter and Change 24
Laboratory Manual
Copyright Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc
Name
Date
Class
LABORATORY MANUAL
Use with Section 253
Radioisotope Dating
he Zag meteorite fell in the western Sahara of Morocco in August 1998 This meteorite was unusual in that it contained small crystals of halite (table salt), which experts believe formed by the evaporation of brine (salt water) It is one of the few indications that liquid water, which is essential for the development of life, may have existed in the early solar system The halite crystals in the meteorite had a remarkably high abundance of 128Xe, a decay product of a short-lived iodine isotope that has long been absent from the solar system Scientists believe that the iodine existed when the halite crystals formed The xenon formed when this iodine decayed For this reason, the Zag meteorite is believed to be one of the oldest artifacts in the solar system In this lab, you will use potassium-argon radiochemical dating to estimate the age of the Zag meteorite and the solar system
Problem
What is the age of the solar system
Objectives
Determine the age of the Zag meteorite, using potassium-argon (K-Ar) radiochemical dating
Materials
calculator graph paper (4 sheets)
Copyright Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc
Safety Precautions
Always wear safety goggles and a lab apron
Pre-Lab
1 Suppose the initial number of nuclei of a radioac-
Procedure
1 Data Table 1 shows a number of quantities that
tive nuclide is N0, and that the half-life is T Then the amount of parent nuclei remaining at a time t can be written as N1 N0(1/2)(t/T) This relationship is called the radioactive decay equation What is the number of daughter nuclei present at time t, expressed in terms of N0 and N1 2 What is the ratio of daughter nuclei to parent nuclei at time t expressed in terms of N0 and N1 Simplify the expression 3 Use the radioactive decay equation to eliminate N0 and N1 from your answer to question 2 4 40K decays to 40Ar 40K has a half-life of 19 20 19 125 109 years and decays by positron ( 0 ) 1 emission Write the equation for this nuclear reaction
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