Chapter 2 Water and pH

Question 1

Draw two water molecules and hydrogen bonding between the water molecules.

Answer 1

Question 2

Describe the four properties of water and their importance in living organisms.

Answer 2

1. Water is a polar solvent
2. Water has cohesion
3. Water has high heat capacity
4. Water has a high heat of vaporization

Question 3

Solution

Answer 3

two substances that are mixed together

Question 4

Solute (socute)

Answer 4

a substance to be dissolved

Question 5

Solvent

Answer 5

the one doing the dissolving

Question 6

Why is water important in cohesion?

Answer 6

allows blood to move more easily in the blood vessels

Question 7

Water has high heat capacity, why is that important?

Answer 7

It takes a long time to break off molecules

Question 8

Water has a high heat of vaporization, why is that important?

Answer 8

changes liquid to gas hence sweat is mainly water, when we sweat the body uses heat to vaporize the water - cooling us off.

Question 9

Common Acids

Answer 9

• Lemon Juice
• Vinegar

Question 10

Common Basis

Answer 10

Ammonia
Household cleaners
Bleach

Question 11

Define Acids

Answer 11

Donates hydrogen ions

Question 12

Define Bases

Answer 12

Accepts ions will release (OH hydroxyl ions)

Question 13

On the pH scale, 0 - 6 is

Answer 13

Acidic

Question 14

On the pH scale, 7 is

Answer 14

Neutral

Question 15

On the pH scale, 8 - 14 is

Answer 15

Basic

Question 16

What is a Buffer

Answer 16

A buffer can resist pH change upon adding acidic or basic compounds.

Question 17

Define Cohesion

Answer 17

water that sticks together, so blood can flow easily in blood vessels.