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

Question 
Question 1 
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.