1.1 Water & Ions

Name the intermolecular bond between water molecules.

• Ionic bond

• Hydrogen bond

• Covalent bond

• Peptide bond

Which term describes the way in which water molecules are attracted to other water molecules?

• Cohesion

• Adhesion

• Surface tension

• Capillary action

Which term describes the way in which water molecules are attracted to other other molecules?

• Cohesion

• Adhesion

• Surface tension

• Capillary action

Which elements make up water?

• Two oxygen, two hydrogen

• Two oxygen, one hydrogen

• One oxygen, one hydrogen

• One oxygen, two hydrogen

Water molecules stick together forming a 'film' around a droplet or at the surface of a body of water. Name this phenomenon.

• Cohesion

• Adhesion

• Surface tension

• Capillary action

What name is given to a molecule which has a positive and a negative charge in different areas?

• Polar

• Non-polar

• Hydrophobic

• Hydrophilic

Which property of water makes aquatic environments thermally stable?

Identify one importance of cohesion for animals and for plants.

• Surface tension creates habitats for pond-skaters and other invertebrates.

• Floating ice insulates water beneath it.

• Water enters plant roots by osmosis.

• As water molecules evaporate from leaves, they pull other water molecules up from the roots during transpiration.

Why is water described as a universal solvent?

• Water molecules form hydrogen bonds with polar/charged particles in solution.

• Water molecules form hydrogen bonds with non-polar/uncharged particles in solution.

• Water molecules form hydrogen bonds with non-polar/charged particles in solution.

• Water molecules form hydrogen bonds with polar/uncharged particles in solution.

How does water's high heat of vaporisation benefit animals?

• Water in saliva absorbs lots of heat before evaporating to cool the body.

• Water in sweat absorbs lots of heat before evaporating to heat the body.

• Water in sweat absorbs very little heat before evaporating to cool the body.

• Water in sweat absorbs lots of heat before evaporating to cool the body.