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Questions for Thought
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1

How is a solution different from other mixtures?
2

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

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

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

Explain why water has a greater density at 4°C than at 0°C.
6

What is hard water? How is it softened?
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.
8

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

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

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

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





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