Other methods of extracting metal

Question 1

Why is electrolysis more expensive than reduction?

Is it cheaper to extract metals higher up or lower in the reactivity series?

Answer 1

large amounts of e needed=expensive
melting or dissolving metal ore=costs
lower down-less reactive cheaper

Question 2

Name and explain the I bacterial method used to extract metals.

Answer 2

Bioleaching-bacteria separate metals from ore,b get energy from bonds between atoms in ore,separating metal from ore in process.

leachate produced=solution contains metal ions,extracted using electrolysis/displacement

Question 3

Name and explain another biological method used to extract metals.

Answer 3

phytoextraction-growing plants in soil contain m compounds
plant cant use or get rid of m so gradually builds up in leaves,p can be harvested,dried and burned in furnace

ash contains m compounds ,m extracted using electrolysis/displacement

Question 4

why is it important to recycle metals?

Answer 4

conserves energy and resources
finite amount of raw m-metals non-renewable
saves energy-only small fraction of energy needed to extract and refine

Question 5

How does extracting metals affect the environment?
How does recycling reduce its affect?
Explain 2 ways in which recycling has economic benefits

Answer 5

mining-destroy habitat/environment/eyesore
cuts down amount of rubbish sent to landfills that take up space & pollute surroundings

massive industry=creates jobs
each stage = job transported,processed,reprocessed

Question 6

For every 1 kg of aluminium we recycle how much energy you save?
aluminium ore?
waste?

Answer 6

95% compared to fresh aluminium
4kg of Al O
a lot of waste