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Physical Science, 5/e
Bill Tillery, Arizona State University

Water and Solutions

Essay Quiz



1

How is a solution different from other mixtures?
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2

Explain why some ionic compounds are soluble while others are insoluble in water.
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3

Explain why adding salt to water increases the boiling point.
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4

A deep lake in Minnesota is covered with ice. What is the water temperature at the bottom of the lake? Explain your reasoning.
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5

Explain why water has a greater density at 4 (degrees sign after the number 4) C that at 0 (degrees sign after the number 0) C.
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6

What is hard water? How is it softened?
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7

According to the definition of an acid and the definition of a base, would the pH increase, decrease, or remain the same when NaCl is added to pure water? Explain.
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8

What is a hydrogen bond? Explain how a hydrogen bond forms.
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9

What feature of a soap molecule gives it cleaning ability?
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10

What ion is responsible for (a) acidic properties? (b) for basic properties?
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11

Explain why a pH of 7 indicates a neutral solution-why not some other number?
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12

What is a buffer solution?
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