1.7 water

Question 1

discuss water as a polar molecule

Answer 1

uneven distribution of charge due to +ve H ions and -ve O ions means ionic substances can dissolve in it

Question 2

what is high specific heat capacity?

Answer 2

it means water needs a lot of energy to change it’s temperature, which is ideal for organisms that live in rivers and lakes

Question 3

why does water have a large latent heat of vapourisation?

Answer 3

so that the evaporation of water provides a cooling effect with little water loss

Question 4

what are cohesion and adhesion?

Answer 4

cohesion is when water molecules stick together due to hydrogen bonds between H+ and O- meaning it can be transported in xylem tubes and surface tension is also high at water-air boundaried
adhesion is when water molecules stick to the sides of tube like cells

Question 5

what is the maximum density of water?

Answer 5

• 4’C
• ice is less dense than water as molecules are more spaced apart
• ice floats on water creating habitats and insulation layers

Question 6

what are the advantages of water being incompressible?

Answer 6

• provides good support and structure in xylem or earth worms who have no skeleton
• can also be used in hydraulic mechanisms