Ores

Question 1

What does the way in which a metal is extracted depend on?

Answer 1

It’s reactivity

Question 2

What is a ore?

Answer 2

A rock which contains enough of a compound to make it worthwhile extracting a metal from it for a profit.

Question 3

How are unreactive metals found?

Answer 3

An element.

Uncombined - so in pure lumps in he earths crust

Question 4

How are reactive metals found?

Answer 4

In compounds

Question 5

What does the ore haemite contain?

Answer 5

Iron oxide

Question 6

What do metals most have to be separated from?

Answer 6

Their oxides

Question 7

What is extraction?

Answer 7

The process of getting a metal from a compound in rock (ore) by a chemical reaction.

Question 8

What is the reactivity series?

Answer 8

A list of metals on order of their reactivity

Question 9

How are metals less reactive than carbon extracted?

Answer 9

By heating with carbon

Question 10

What metals are less reactive than carbon in the reactivity series? Least to most reactive

Answer 10

Lead
Tin
Iron
Zinc

Question 11

Why can only metals less than carbon be extracted from by a reduction reaction with carbon?

Answer 11

More reactive elements form compounds more readily - so carbon can take the oxygen from less reactive metals.

Question 12

What method of extraction is used for metals that are more reactive than carbon?

Answer 12

Electrolysis

Question 13

What are in the metals in the reactivity series that are more reactive than carbon? Least to most reactive

Answer 13

Aluminium 
Magnesium
Calcium
Sodium
Potassium

Question 14

Why can’t metals more reactive than carbon be reduced by heating with carbon?

Answer 14

Reactive metals form stable ores so it’s difficult to get the metal out of its compound. This means electrolysis has to be used.

Question 15

Why is electrolysis more expensive than heating with carbon?

Answer 15

The cost of electricity - the more reactive a metal is, the harder and more expensive it is to extract.

Question 16

What is oxidation?

Answer 16

The addition of oxygen to a substance. This is how metal oxides are formed.

Question 17

What is corrosion?

Answer 17

When the surface of a metal changes by reaction with oxygen and sometimes water. When metals corrode they are oxidised.
WHEN METALS REACT WITH OXYGEN IN THE AIR TO FORM METAL OXIDES

Question 18

What is rust?

Answer 18

The corrosion if iron.

Question 19

Explain how rust occurs.

Answer 19

When iron rusts, it combines with oxygen and water. The iron gains oxygen to form iron (III) oxide. Water becomes loosely bonded to the iron (III) oxide and turns this into hydrated iron (III) oxide, otherwise known as rust.

Question 20

What is reduction?

Answer 20

The loss of oxygen from a substance.

Question 21

Why is extraction a reduction reaction?

Answer 21

To separate a metal from its oxide, the oxygen has to be removed, so the extraction of metals from their oxides is called reduction.

Question 22

Why does corrosion of metal happen?

Answer 22

The metal is being oxidised.