Lesson 5.4

Question 1

Define cohesion

Answer 1

Bonding between H20 molecules

Question 2

Define adhesion

Answer 2

Bonding between H20 and other substances

Question 3

Define solvent

Answer 3

A solvent dissolves a solute

Question 4

Define specific heat

Answer 4

the amount of heat needed to raise the temperature of 1 gram of a substance 1 degree Celsius (°C).

Question 5

Define heat of vaporization

Answer 5

the amount of heat needed to turn 1 g of a liquid into a vapor, without a rise in the temperature of the liquid.

Question 6

Define concentration

Answer 6

the measurement of the number of particles in a given volume, often in a mixture or solution.

Question 7

Define pH and pOH

Answer 7

pH - potential hydrogen; measures hydronium on a logarithmic scale
pOH - measures hydroxide on a logarithmic scale

Question 8

Define hydronium ion and hydroxide

Answer 8

1. the product of {H3O+}
2. the product of {OH-}

Question 9

Define acid and base

Answer 9

acid - a substance that forms hydrogen ions H+ when dissolved in water
base - a substance that forms hydroxide ions OH- when dissolved in water

Question 10

What are the five properties of water?

Answer 10

1. Cohesion and Adhesion
2. Water is the solvent of life
3. Ice is less dense than liquid water
4. High-specific heat
5. Heat of vaporization

Question 11

Explain how water’s polarity or ability to make hydrogen bonds gives it each property

Answer 11

As a result of water’s polarity, each water molecule attracts other water molecules because of the opposite charges between them, forming hydrogen bonds.

Question 12

Examples of why each property of water is important to living things

Answer 12

• vital for the transportation of nutrients
• removes body heat