Limestone and Metals

Question 1

What is limestone?

Answer 1

Calcium Carbonate- CaCO3

Question 2

What equation shows thermal decomposition of limestone?

Answer 2

CaCO3 -> CaO + CO2

Question 3

What is produced when carbonates react with acids?

Answer 3

CO2 + H20 (and salt)

Question 4

What is achieved when water is added to calcium oxide?

Answer 4

Calcium Hydroxide

Question 5

How is calcium hydroxide used to test for carbon dioxide?

Answer 5

It is added to the solution and goes cloudy if CO2 is present

Question 6

How is limestone used?

Answer 6

• It is heated in a kiln with clay to produce cement
• Cement mixed with sand and water creates mortar
• Cement mixed with sand and aggregate creates concrete

Question 7

What is limestone used for? (Object wise)

Answer 7

• Houses and roads
• Dyes, paints and medicines
• Neutralise acidic soils and lakes; sulphur dioxide

Question 8

Advantages in quarrying limestone:

Answer 8

• Provides jobs
• Brings money to community
• Contract usually includes restoration

Question 9

Disadvantages of quarrying limestone:

Answer 9

• Area looks bad
• Noise and dust pollution
• Destroys habitats
• Causes traffic

Question 10

What is a metal ore?

Answer 10

The simplest form of metal (in rocks)

Question 11

How are metals extracted from their ore?

Answer 11

Reduction and electrolysis

Question 12

What is smelting?

Answer 12

Extracting copper by heating in a furnace

Question 13

What is electrolysis?

Answer 13

Breaking it down with electricity

Question 14

How is copper purified in electrolysis?

Answer 14

Electrons are pulled off the copper atoms and go into the solution. Ions gain the electrons and turn back into copper atoms

Question 15

How can copper be extracted?

Answer 15

By using scrap iron for displacement. Products are iron sulphate solution and copper

Question 16

What happens with bioleaching?

Answer 16

Bacteria absorbs the copper compounds and this leads to leachates, which contain the copper.

Question 17

What happens with phytomining?

Answer 17

Phytomining is where plants absorb the parts of the metal and burned to produce ash containing the copper

Question 18

Describe the properties of copper:

Answer 18

• Conducts electricity
• Hard
• Non-reactive with water

Question 19

Describe the properties of aluminium;

Answer 19

• Doesn’t corrode
• Not too strong
• Low density

Question 20

Describe the properties of titanium:

Answer 20

• Low density
• Doesn’t corrode
• Strong

Question 21

Why is it important to recycle metals?

Answer 21

They last longer and less money is spent. Saves energy and money as well as stopping waste and the metals running out as fast.