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10 Jan
2021

DEMONSTRATING POLAR PROPERTIES

Category:ACADEMICIAN

SOLUTION AT Australian Expert Writers

acetate (overhead transparency material) strip and tissue papervinyl strip and woolen clothslow, steady stream of water from a faucet
Follow these directions and answer these questions.
Rub the acetate strip with the tissue paper.
Bring the strip near a slow stream of running water.
What happened when the strip was brought near the stream?
From your ideas about charges on acetate and vinyl strips, predict what will happen if a charged vinyl strip is brought near the slow stream of water. (Review Unit 4.)
Test your hypothesis. Rub a vinyl strip with a woolen cloth.
Bring the charged strip near a slow stream of water.
Now analyze your prediction.
a. Was your prediction correct?
b. If not, propose a reason for the difference.
Analyze the shape of H2O.a. What is the shape of the H2O molecule?b. Is it symmetrical?c. Does this mean that the H2O molecule is polar or nonpolar?
Analyze the bonds of CCl4.a. What is the shape of the CCl4 molecule?b. Is it symmetrical?c. Does this mean that the CCl4 molecule is polar or nonpolar?
Assume that the water stream is replaced by a stream of CCl4. Predict what would happen in each case.
a. charged acetate strip:
b. charged vinyl strip:
c. Explain your predictions.
Chemists have found that charged acetate and vinyl strips have no effect on a stream of CCl4. Does this fact match your prediction?
Develop a model or picture of water, H2O, and carbon tetrachloride, CCl4, that would account for observations with the charged strips for the two compounds.
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