2.2 Water

Nature of science

Use theories to explain natural phenomena—the theory that hydrogen bonds form between water molecules explains the properties of water. (2.2)

Understandings

Water molecules are polar and hydrogen bonds form between them.

Hydrogen bonding and dipolarity explain the cohesive, adhesive, thermal and solvent properties of water.

Substances can be hydrophilic or hydrophobic.

Applications and skills

Comparison of the thermal properties of water with those of methane.

Use of water as a coolant in sweat.

Modes of transport of glucose, amino acids, cholesterol, fats, oxygen and sodium chloride in blood in relation to their solubility in water.