Chemistry 1

Question 1

Place these in order of reactivity:
Sodium
Iron
Magnesium
Aluminium
Gold

Answer 1

Most reactive: Sodium
Magnesium
Aluminium 
Iron
Least Reactive: Gold

Question 2

What is Electrolysis?

Answer 2

Electrolysis is the process of chemically decomposing a substance (commonly metal) and then sending electricity through it.

Question 3

Which is most expensive method of removing metal from ores and why?

Electrolysis or Carbon?

Answer 3

Electrolysis because you have to heat the metal first, then send electricity through it. You have to pay for the equipment and machinery also.

Question 4

Why was it hard/until recently impossible, to remove really reactive metals from Ores?

Answer 4

Because Electrolysis (in terms of science) was a recent discovery

Question 5

Why couldn’t we use Carbon to remove more reactive metals from their ores?

Answer 5

Because carbon was less reactive and not reactive enough to complete the process required to separate the metal.

Question 6

What is the general equation for metal reacting with oxygen?

Answer 6

Metal + oxygen —> Metal Oxide

Eg. Iron + Oxygen —> Iron Oxide

Question 7

State one advantage of recycling?

Answer 7

Recycling helps the environment and wildlife - for example plastic, if recycled, animals can’t feed off it/eat it.

Question 8

State one disadvantage of recycling?

Answer 8

After so many times certain items are recycled, they will become unrecyclable meaning that they will no longer be able to be recycled!