Rocks and Building Materials

Question 1

What are the main uses of limestone?

Answer 1

1. As a building material (blocks)
2. To make calcium oxide
3. To make cement

Question 2

How is conrete made?

Answer 2

By mixing cement with sand, aggregate, and water

Question 3

What kind of reaction occurs when calcium carbonate is heated?

Answer 3

Thermal decomposition.

Question 4

What products are made when calcium carbonate is heated?

Answer 4

Calcium oxide (CaO) and carbon dioxide

Question 5

What products are formed when metal carbonates are heated strongly?

Answer 5

A metal oxide and carbon dioxide

Question 6

What products are formed when metal carbonates react with acid?

Answer 6

A salt, water, and carbon dioxide.

Question 7

A Bunsen burner flame cannot get hot enough to decompose which paticular metal carbonates?

Answer 7

Sodium carbonate and potassium carbonate.

Question 8

Why is limestone damaged by acid rain?

Answer 8

Because the calcium carbonate in the limestone reacts with the acids in the rain to form salt, water, and carbon dioxide.

Question 9

What is the chemical name for limewater?

Answer 9

Calcium hydroxide solution

Question 10

What can limewater be used to test for and how does this work?

Answer 10

Carbon dioxide. The limewater turns cloudy as it reacts with the carbon dioxide to produce insoluble calcium carbonate (which is what the cloudiness is).

Question 11

Draw a diagram showing each stage of the lime cycle.

Answer 11

Question 12

How is cement made?

Answer 12

Limestone is mixed with clay and heated strongly in a kiln. The product is then ground up to make a fine power.

Question 13

How is mortar made?

Answer 13

By mixing cement with sand and water

Question 14

What is mortar used for?

Answer 14

Holding bricks and blocks together in buildings

Question 15

What is aggregate made out of?

Answer 15

Small stones or crushed rock.

Question 16

Complete the sentence:

________ can be poured into moulds before it sets to form a _____ _____.

Answer 16

Concretecan be poured into moulds before it sets to form a hard solid.

Question 17

What do we depend on limestone for?

Answer 17

Building materials. Cement and conrete are needed in most buildings

Question 18

What are the disadvantages of quarrying limestone?

Answer 18

• Dust and noise
• More traffic
• Loss of wildlife habitats
• The environment is permanently changed
• Often cement works are built nearby. These use large amounts of land and energy to heat the limestone with clay in large kilns.

Question 19

What are the advantages of quarrying limestone?

Answer 19

• More employment for locals
• Once quarries are no longer used, can be turned into new wildlife habitiats or used for rock climbing
• Improved roads/infrastructure
• Currently the only way of getting limestone needed