Water

Question 1

describe the structure and bonding present in water (3 marks)

Answer 1

-Water is a covalent compound made up of 2 hydrogen atoms + 1 oxygen
-polar molecule
-oxygen has a slight negative charge and
hydrogen atoms have a slight positive charge

Question 2

how do hydrogen bonds occur (1 mark)

Answer 2

Hydrogen bonds (attractive force between opposite
charges) form between water molecules causing
them to ‘stick together’.

Question 3

name 5 properties of water (5 marks)

Answer 3

-metabolite
-universal solvent
-high specific heat capacity
-high latent heat of vaporisation
-strong cohesion between water molecules

Question 4

why is it important that water is a metabolite (2 marks)

Answer 4

• water is reactive
  -used in reactions eg. condensation, hydrolysis, photosynthesis, respiration

Question 5

why is it important that water is a universal solvent (3 marks)

Answer 5

-dissolves more substances
-allows transport of substances (eg. nitrates in xylem, urea in blood)
-allows metabolic reactions to occur faster

Question 6

why is it important that water has high specific heat capacity ()