fopic 4

Question 1

explain heating with carbon extraction method

Answer 1

iron oxide loses oxygen and is therefore reduced. carbon gains oxygen and is oxidised

for iron, carried out at high temperatures in a blast furnace

Question 2

phytoextraction

Answer 2

plants absorb metal compounds through roots

concentrate compounds into their shoots and leaves

plants can be burned to produce an ash that contains these compounds

Question 3

bacterial extraction

Answer 3

bacteria absorb metal compounds
produce solutions called leachate which contain them
scarp iron can be used to obtain metal from leachate

Question 4

what is dynamic equilibrium

Answer 4

once the forward and backward reaction reach equilibrium, they keep goin

Question 5

dynamic equilibrium with nitrogen and ammonia

Answer 5

nitrogen from air and hydrogen from natural gas or other sources

purified gases passed over catalyst or iron at a high temperature and pressure

some of hydrogen and nitrogen reacts to form ammonia

reaction is reversible so ammonia breaks down again into nitrogen and hydrogen

nitrogen + hydrogen -><- ammonia

Question 6

what temperature for haber process

Answer 6

450 degreee C

Question 7

what pressure for haber process

Answer 7

200 atmospheres

Question 8

what catalyst you need for haber process

Answer 8

iron catalyst

Question 9

what happens when increasing temperature equilibrium

Answer 9

goes in direction of endothermic reaction vica versa

Question 10

pressure change on equilibrium

Answer 10

favours reaction that produces/reacts more moles on each side