Unit 5.4

Question 1

___ attracts different molecules.

Answer 1

Adhesion - cohesion attracts like molecules

Question 2

A solvent ___, while a solute ___.

Answer 2

A solvent dissolves other substances, while a solute is what is being dissolved. (These combine to form a solution.)

Question 3

What is specific heat?

Answer 3

the amount of heat required to raise the temperature of one gram of a substance by 1°C

Question 4

What are the five special properties of water?

Answer 4

1) cohesion and adhesion
2) good solvent
3) lower density as a solid than liquid
4) high specific heat
5) high heat of vaporization

Question 5

What does pH stand for?

Answer 5

potential hydrogen

Question 6

Because of how polar water is, it occasionally splits into ___ and ___.

Answer 6

hydronium (H₃O⁺) and hydroxide (OH⁻)

Question 7

Describe the pH of an acidic substance.

Answer 7

An acidic substance’s pH is less than 7 and increases with dilution from water.

Question 8

H₃O⁺ = 10⁻⁹
OH⁻ = ___

Answer 8

OH⁻ = 10⁻⁵

Question 9

Does volume or dilution change a substance’s pH? How?

Answer 9

Dilution changes a substance’s pH, as it increases that of acidic substances, and decreases that of basic substances

Question 10

pH = 4
H₃O⁺ = ___

Answer 10

H₃O⁺ = 10⁻¹⁰