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Question 19

What happens to the volume of a gas when the temperature is increased?

a
The volume stays the same
b
The volume is decreased
c
The volume is increased
Question 20
Which of the following will increase the rate at which a solute dissolves? (Select all that apply.)

a
increasing temperature
b
decreasing temperature
c
decreasing surface area
d
stirring
e
increasing surface area
Question 21
Match the pH to its description.

Column A
1.
pH above 7:
pH above 7
2.
pH below 7:
pH below 7
3.
pH of 7:
pH of 7
Column B
a.basic
b.acidic
c.neutral

1 answer

Here are the answers to your questions:

Question 19: What happens to the volume of a gas when the temperature is increased?

  • c The volume is increased. (This is based on Charles's Law, which states that the volume of a gas is directly proportional to its temperature when pressure is constant.)

Question 20: Which of the following will increase the rate at which a solute dissolves? (Select all that apply.)

  • a increasing temperature
  • d stirring
  • e increasing surface area

(Decreasing temperature and decreasing surface area would decrease the rate at which a solute dissolves.)

Question 21: Match the pH to its description.

  1. pH above 7: a. basic
  2. pH below 7: b. acidic
  3. pH of 7: c. neutral

These descriptions reflect the properties of acids, bases, and neutral solutions according to the pH scale.