Water (2.2)

Question 1

Describe the structure of water

Answer 1

Water is made up of two hydrogen atoms covalently bonded to an oxygen atom. It is a polar molecule because of the charge difference between the oxygen and hydrogen atoms. Oxygen is slightly negative and hydrogen is slightly positive.

Question 2

Hydrophilic

Answer 2

Water attracting. Hydrophilic compounds dissolve in water because the molecules are more attracted to the water than they are to each other.

Question 3

Hydrophobic

Answer 3

Water-repelling. Hydrophobic compounds do not dissolve in water because the molecules are more attracted to each other than they are to the water.

Question 4

Why does water have thermal properties?

Answer 4

Because water can absorb a lot of heat before changing state. This is due to the extensive hydrogen bonding between water molecules. The hydrogen bonds have to be broken before a change in state can occur so this requires a lot of energy.

Question 5

Why does water have cohesive/adhesive properties?

Answer 5

Because water molecules have the capacity to form intermolecular associations with molecules that share common properties.

Question 6

Why does water have solvent properties?

Answer 6

Because of its polarity.