T = Water purification, thermal stability

Question 1

Define chlorination

Answer 1

Adding chlorine to water in order to kill the bacteria in it

Question 2

Define aquifier

Answer 2

A rock that absorbs large amount of water

Question 3

Define resevoir

Answer 3

A place where water is treated and stored

Question 4

Define coagulant

Answer 4

Any binding agent to enable solid particles to stick together

Question 5

How is water cleaned using filtration and chlorination?

Answer 5

1. The water is filtered to remove all the insoluble particles.
2. Chlorine is added to sterilise it, remove any bacteria so that it’s safe to drink

Question 6

Chemical tests to identify the presence of water? (2)

Answer 6

1. Anhydrous copper(II) sulphate. It goes from white to blue in the presence of water
2. Cobalt(II) chloride paper. It goes from blue to pink in the presence of water

Question 7

Action of heat on:

1. Hydroxides of Aluminium and the transition metals
2. Nitrates of group I
3. Nitrates of group II
4. Nitrates of transition metals

Answer 7

1. Reactant –> metal oxide + water
2. Reactant –> metal nitrate + oxygen
3. Reactant –> metal oxide + nitrogen dioxide + oxygen
4. Same as 3