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Examination of Physical and Chemical Properties
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experiment 1: Density of a substance
Data Sheet
Table 1: Isopropyl Alcohol Data
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Measurement
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Result
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Mass of 10 mL graduated cylinder (g):
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Volume of alcohol added to graduated cylinder (mL):
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Mass of graduated cylinder and alcohol (g):
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Mass of alcohol (g):
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Calculated (Experimental) density of alcohol (in g/mL):
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Actual density of isopropyl alcohol:
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0.790 g/mL
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Experimental error (use Equation 1 below, %):
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Equation 1:
Table 2: Corn Oil Data
Measurement
Result
Mass of 10 mL graduated cylinder (g):
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Volume of corn oil added to graduated cylinder (mL):
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Mass of graduated cylinder and corn oil (g):
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Mass of corn oil (g):
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Experimental (calculated) density of corn oil (g/mL):
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Actual density of corn oil:
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0.925 g/mL
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Experimental error (use Equation 1, %):
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Table 3: Acetic Acid Data
Measurement
Result
Mass of 10 mL graduated cylinder (g):
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Volume of acetic acid added to graduated cylinder (mL):
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Mass of graduated cylinder and acetic acid (g):
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Mass of acetic acid (g):
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Experimental density of acetic acid (g/mL):
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Actual density of acetic acid:
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1.006 g/mL
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Experimental error (use Equation 1, %):
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1) Use your calculated densities to rank isopropyl alcohol, corn oil, and acetic acid from least dense to most dense.
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2) What factors could have contributed to your experimental value being different from the actual value?
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3) Ice naturally floats on water due to lower density. If ice did not float on top of water, describe two different ways in which the world would be different?
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experiment 2: solubility and reactivity
Data Sheet
Table 4: Physical and Chemical Property Test Results
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Powder
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Color
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Texture
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Acetic Acid Effervescence (Yes or No)?
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IKI Solution Color Change
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Hot Water Effervescence (Yes or No)?
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Baking Powder
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Baking Soda
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Cornstarch
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Unknown
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Post-Lab Questions for Exp 2 (+4 pts)
1) Use your results to identify the unknown powder. State the evidence from your Table 4 data on the known substances that supports your identity for the unknown.
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2) Did any of the substances have one minor difference in reaction results? If so, what would you do next to confirm the identity of the unknown substance? Use your results to support your answer.
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3) How were all of the known powder substances similar to each other in terms of their physical properties?
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4) Describe the difference between a physical change and a chemical change as seen in this experiment.
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