Chemistry paper 2

Question 1

describe the process of catalytic cracking.

Answer 1

heat the hydrocarbons until they vaporise.
pass the vapour over a catalyst.
thermal decomposition happens.

Question 2

Describe steam cracking

Answer 2

vaporise it.
mix it with steam.
Heat it.

Question 3

why did levels of carbon decrease

Answer 3

process of photosynthesis through plants, algae and being locked up in sedimentary rock and fossil fuels.

Question 4

how is potable water produced.

Answer 4

fresh water collected.
pass through filter beds to remove solid particles.
chlorine added to kill microorganisms
oozone and uv can be added to sterilise.
Fluoride is also added for dental hygiene.

Question 5

what is photo mining?

Answer 5

as plants grow in copper rich soils it builds up in there leaves
plants are burned and copper is left

Question 6

what is bio leaching

Answer 6

solution with bacteria is mixed with a low grade ore.
They convert the Cu into a solution known as leach ate solution which Cu can be extracted from using electrolysis or reactivity displacement

Question 7

what does LCA measure?

Answer 7

extraction.
procession.
manufacturing.
usage of product.
transportation of product.
disposal