Environmental stuff

Question 1

Use of Ca(OH)2

Answer 1

Neutralises acidic soils

Question 2

Use of Mg(OH)2

Answer 2

Antacid - treat indigestion

Question 3

Use of CaCO3

Answer 3

Antacid - treat indigestion

Question 4

Why CFCs concentration in atmosphere has hardly changed?

Answer 4

Long lifetime
Still entering atmosphere
(No idea if we actually need to know this)

Question 5

Dis/Advantages of Cl

Answer 5

Toxic

Kills Bacteria

Question 6

Overall equation of breakdown of Ozone

Answer 6

O3 + O -> 2O2

Question 7

Cl radicals causing breakdown of Ozone

Answer 7

Cl. + O3 -> ClO. + O2

ClO. + O -> Cl. + O2

Question 8

Uses for waste polymers

Answer 8

Landfill
Combustion (Burn Baby Buuuurn!)
Sort and recycle
Feedstock Recycling

Question 9

Type of Polymer being developed to minimise environmental damage

Answer 9

Biodegradable

Question 10

Photodissociation of CFCs

Answer 10

CF2Cl2 -> Cl. +CF2Cl.

C-Cl weaker than C-F

Question 11

Feedstock Recycling

Answer 11

Reclaim monomers, oil or gases from waste polymers to be used in the production of new polymers. No need to sort waste polymers before.

Question 12

Problems with combustion of PTFE or PVC

Answer 12

Release acidic gases. HCl(g)

Question 13

Advantages of Polymers from natural foods

Answer 13

Reduces dependency on fossil fuels
Biodegrable
Photodegradable