Water

Question 1

Name 5 features of water?

Answer 1

Metabolite
Solvent
Heat capacity of water
Latent Heat of Vaporisation
Cohesion

Question 2

Explain how water is a solvent

Answer 2

Water is a Polar molecule due to the partial negative charge on Oxygen and partial positive on Hydrogen.Polar molecules and ionic compounds will form interactions with water molecules and dissolve

Question 3

Explain how water is a metabolite

Answer 3

It is used in chemical reactions. Hydrolysis and condensation involve water molecules. Water is a product respiration and a substrate in photosynthesis

Question 4

Explain how water is involved in Cohesion

Answer 4

Water molecules stick to each other by cohesion. Hydrogen bonds form between water molecules. In the xylem vessel, cohesion allows thin columns of water to be pulled up towards leaves for transpiration. When water meets air, water molecules on surface are more strongly attracted to each other due to Surface Tension

Question 5

What is the difference between Cohesion and Adhesion?

Answer 5

Cohesion is the attraction between water molecules and adhesion is the attraction between water molecules and other substances

Question 6

Explain the feature of Latent Heat of Vaporisation

Answer 6

Energy is required to turn water into water vapour. Water has a high latent heat of vaporisation so requires a lot of energy for a little amount of water so there is little loss of water through evaporation due to the many hydrogen bonds needed to be broken.

Question 7

Explain the feature of the heat capacity of water

Answer 7

Water has a high heat capacity of water - it doesn’t readily change temp as there a lot of hydrogen bonds which provide a stable environment for aquatic organism

Question 8

Outline other features of water

Answer 8

Ice is less dense than water sp will act as an insulating layer. Water is transparent so plants beneath surface can photosynthesise.