Essay Quiz


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 (degrees sign after the number 4) C that at 0 (degrees sign after the number 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?



12		What is a buffer solution?

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