15: Chemicals from salt

Question 1

Uses for sodium chloride in food

Answer 1

Preservative

Flavouring

Question 2

Where is salt found?

Answer 2

Evaporating sea water

Salt deposits

Question 3

What is solution mining?

Answer 3

Process of obtaining a chemical such as salt from underground by dissolving it in water so it can be pumped to the surface

Question 4

What is brine?

Answer 4

Concentration solution of sodium chloride in water

Question 5

Process of solution mining

Answer 5

Water is pumped from the surface into the deposit deep underground.
The sodium chloride dissolves in the water, and the brine is pumped up to the surface.

Question 6

Problems of mining

Answer 6

May call subsidence- this is where the land slumps downwards because of a mine below, leading to cracked buildings and holes appearing

Question 7

What substances does the electrolysis of brine produce?

Answer 7

Hydrogen
Chlorine
Sodium Hydroxide Solution

Question 8

Word equation for production of bleach

Answer 8

sodium hydroxide + chlorine = sodium chloride + water + sodium chlorate(bleach)

Question 9

What is chlorine used for?

Answer 9

Sterilising water
Manufacturing other substances eg. polymer PVC
To make bleach and some solvents