Water

Question 1

Properties of water

Answer 1

1. Water dissolves many substances
2. Water regulates temperature
3. Water expands as it freezes
4. Water takes part in life’s chemical reactions
5. Water is cohesive and adhesive
6. Water adheres to other substances

Question 2

Distinguish between adhesion and cohesion

Answer 2

Adhesion: It is the attraction between the molecules of two different substances

Cohesion: It is the attraction between the molecules or atoms of the same substance.

Question 3

Define specific heat capacity

Answer 3

The amount of heat needed to raise the temperature of 1g of a substance 1 degree celsius

Question 4

Definition of heat of Vaporization

Answer 4

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

Question 5

Distinguish between hydrophobic and hydrophilic

Answer 5

Hydrophobic—water “fearing”

Hydrophilic— water “loving”