Air and Water

3. The chemical process by which ammonia is made in very large quantities from nitrogen and hydrogen.
5. A substance added to soil to increase the amount of elements such as nitrogen, potassium and phosphorus.
7. he process used to extract individual gases from the air. Air is a major raw material. The mixture of gases is separated by first liquefying the mixture at low temperature and high pressure. The temperature is then allowed to rise and the gases collected as they boil off. The gases so produced have many and varied uses.
8. A colourless, odourless gas, soluble in water, producing a weak acid called carbonic acid. It makes up 0.04% of air. It is produced by respiration in all living things and by the burning of fossil fuels. It is taken in by plants in photosynthesis.
10. The mixture of gases that surrounds the Earth.

1. A weak intermolecular force (bond) that occurs between water molecules because the bonds within the molecules are polar. It is the strongest of these weak forces.
2. The process by which sulfur dioxide gas is removed from the waste gases of power stations by passing them through calcium hydroxide slurry.
4. A dynamic state,the concentrations of the reactants and products remain constant because the rate at which the forward reaction occurs is the same as that of the back reaction.
6. A process that occurs when fertiliser drains into lakes and rivers, causing algae to multiply rapidly and the water to turn green. it results in fish and other organisms suffocating and dying through lack of oxygen in the water.
9. A chemical that, because of its large usage across a range of uses, is produced in large quantities.