Limestone

Question 1

Why do we quarry large amounts of limestone rock?

Answer 1

Because it has many uses

Question 2

What is limestone mainly made of?

Answer 2

Calcium carbonate

Question 3

What are the three uses of limestone?

Answer 3

As a building material, to make cement and to make calcium oxide

Question 4

What does the decomposition of calcium carbonate make?

Answer 4

Calcium oxide (CaO) and carbon dioxide (CO2)

Question 5

How is concrete made?

Answer 5

By mixing cement with sand, aggregate and water

Question 6

What is the reaction called to make calcium oxide and carbon dioxide called?

Answer 6

Thermal decomposition reaction

Question 7

How is cement made?

Answer 7

By mixing clay and limestone in a kiln

Question 8

What are some other metal carbonates that decompose in a similar way to calcium carbonate?

Answer 8

Magnesium carbonate. zinc carbonate, copper carbonate, sodium carbonate

Question 9

What to all metal carbonates decompose when heated strongly to make?

Answer 9

A metal oxide and carbon dioxide

Question 10

What do all carbonates react with?

Answer 10

Acid

Question 11

What happens when carbonates react with an acid?

Answer 11

They produce salt, water and carbon dioxide

Question 12

Why is limestone damaged by acid rain?

Answer 12

Because the calcium carbonate reacts with the acid in the rain

Question 13

What is the proper name for limewater?

Answer 13

Calcium hydroxide solution

Question 14

What is limewater used to test for?

Answer 14

Carbon dioxide

Question 15

What happens in a test for carbon dioxide?

Answer 15

If carbon dioxide is present the limewater will turn cloudy

Question 16

Why does carbon dioxide make limewater go cloudy?

Answer 16

Because the limewater reacts with carbon dioxide to produce insoluble calcium carbonate

Question 17

What does reacting magnesium with hydrochloric acid make?

Answer 17

Magnesium chloride (salt), water and carbon dioxide

Question 18

What are the products when zinc carbonate is heated strongly?

Answer 18

Zinc oxide and carbon dioxide

Question 19

What is produced when water is added to calcium oxide?

Answer 19

Calcium hydroxide

Question 20

How is calcium hydroxide made?

Answer 20

By adding water to calcium oxide

Question 21

Is calcium hydroxide an acid or an alkali?

Answer 21

An alkali

Question 22

What can calcium hydroxide be used to do?

Answer 22

Neutralise acids

Question 23

What is an example of how calcium hydroxide is used in industry?

Answer 23

It is used by farmers to neutralise acidic soil

Question 24

What does calcium hydroxide react with to produce?

Answer 24

Calcium hydroxide reacts with carbon dioxide to produce calcium carbonate

Question 25

How is calcium carbonate made?

Answer 25

By adding carbon dioxide to calcium hydroxide

Question 26

Describe the limestone cycle.

Answer 26

Calcium carbonate is heated strongly to produce calcium oxide, with carbon dioxide gas given off. A little water is added to calcium oxide to produce calcium hydroxide. More water is added to calcium hydroxide (and filtered) to produce calcium hydroxide solution (limewater). Carbon dioxide is added to calcium hydroxide to produce carbon dioxide.

Question 27

How is mortar made?

Answer 27

By mixing cement with sand and water

Question 28

What are the three advantages of quarrying for limestone?

Answer 28

More employment, improved roads, more trade for local businesses

Question 29

What are three disadvantages of quarrying for limestone?

Answer 29

Loss of habitat and wildlife, dust and noise, more traffic

Question 30

What is a disadvantage of making cement?

Answer 30

It uses a large area of land and energy