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Question 1 

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1. Which of the following is a method of purifying water

A. Fixation

B. Freezing

C. Aeration

D. Combustion

Question 2 

2. A chemical reaction in which two elements or radicals change places with two other elements or radicals is a _______ reaction. 

A. substitution

B. combination

C. decomposition

D. double replacement

Question 3 

3. Based upon the pH scale, a vegetable with a pH of 5.3 would be 

A. basic.

B. acidic.

C. neutral.

D. ionic.

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