Limestone

Question 1

How do you produce calcium oxide from calcium carbonate?

Answer 1

By heating it

Question 2

What are the main ingredients of concrete?

Answer 2

Cement, sand, water and crushed rock

Question 3

When heated, limestone breaks down to form what?

Answer 3

Calcium oxide and carbon dioxide

Question 4

Calcium oxide reacts with water to produce?

Answer 4

Calcium hydroxide

Question 5

Limestone and its products are used for:

Answer 5

Cement, concrete and mortar

Question 6

Carbonates react with acids to produce what?

Answer 6

Carbon dioxide, salt and water

Question 7

When limestone is heated strongly the calcium carbonate it contains decomposed to form what?

Answer 7

Calcium oxide

Question 8

Another name for calcium oxide is what?

Answer 8

Quick lime

Question 9

Calcium oxide (quick lime is what colours when hot and cold?

Answer 9

Yellow when hot and white when cold

Question 10

Quick lime (calcium oxide) reacts with water to form:

Answer 10

Calcium hydroxide

Question 11

Calcium hydroxide is also called what?

Answer 11

Slake lime

Question 12

Limestone is also used to do what?

Answer 12

Reduce excess acidity in lakes and soil

Question 13

How does the limestone cycle go??

Answer 13

1. Calcium carbonate heats to form calcium oxide ( quick lime) and CO2.
2. The quick lime then reacts with water to form calcium hydroxide (slaked lime)
3. When more water is added its filtered & becomes calcium hydroxide solution.
4. CO2 is added to form calcium carbonate again

Question 14

Calcium hydroxide reacts with carbon dioxide to produce:

Answer 14

Calcium carbonate