1.An acid is best defined as:
Select one:
a. a substance with a pH between 0 and 7.
b. a substance with a pH between 7 an 14.
c. a substance that is exactly pH 7.
d. A substance with a pH between 0 and 14.

2.A base is best defined as:
Select one:
a. a substance with a pH between 0 and 7.
b. a substance with a pH between 7 an 14.
c. a substance that is exactly pH 7.
d. A substance with a pH between 0 and 14.

3.A substance that tastes sour and dissociates in water would best be characterized as a(n):
Select one:
a. acid
b. base
c. salt
d. neutral solution

4.Angela is working with a substance that is commonly found in detergents. This substance has a pH of 8.1. Angela is working with a(n):
Select one:
a. acid
b. base
c. salt
d. neutral solution

5._________ is a solution that resists changes in pH by accepting H+ ions or donating H+ ions when the levels change.
Select one:
a. An acid
b. An aqueous solution
c. A pH scale
d. A buffer

6.Farmers do not need to know the impact of pH levels in order to be effective.
Select one:
True
False


7.Most rain water is between the pH of _______.
Select one:
a. 6 and 7
b. 0 and 4
c. 1 and 3
d. 8 and 9

8.Human blood has a pH of:
Select one:
a. 14
b. 11.4
c. 7.4
d. 6.4

9.Ellen is jogging. As her body's metabolism becomes more active, carbon dioxide levels increase, resulting in a decrease in pH. Fortunately, her ___________ in the blood protect against large changes in pH.
Select one:
a. water
b. DNA
c. buffers
d. lipids

10.Ellen is jogging. As her body's metabolism becomes more active, how will her body protect itself initially against acidosis?
Select one:
a. Ellen's body will force her to slow down by cramping her muscles.
b. Ellen's body will regulate pH by using buffers.
c. Ellen's body will trigger the thirst mechanism so that she will drink more water.
d. Ellen's body will release a hormone that increases the size of her muscles.