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show and tell > Rocks And Building Materials > Flashcards

Rocks And Building Materials Flashcards

1
Q

How is concrete made?

A

Mixing cement, sand and aggregate and water

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2
Q

What is the chemical name of limestone?

A

Calcium carbonate caco3

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3
Q

What is limestone used to make?

A

Calcium oxide and cement

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4
Q

How is limestone broken down by heat?

A

Thermal decomposition

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5
Q

What does calcium carbonate decompose to form?

A

Calcium oxide and carbon dioxide

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6
Q

What is the equation of the decomposition of limestone?

A

Calcium carbonate——-> calcium oxide + carbon dioxide

Caco3 ——————-> caO. + co2

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7
Q

What do metal carbonates react to form?

A

Metal oxides and carbon dioxide

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8
Q

What do all carbonates react with acid to form?

A

Salt, water and carbon dioxide

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9
Q

Why is limestone affected by acid rain?

A

The calcium carbonate in the limestone reacts in the rain

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10
Q

What is calcium hydroxide called?

A

Limewater

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11
Q

Why does limewater go cloudy when co2 is added?

A

It starts to reform calcium carbonate

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12
Q

What happens when water is added to calcium oxide?

A

Calcium hydroxide is formed

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13
Q

What calcium hydroxide?

A

Is an alkali and so it can be used to neutralise acids. Calcium hydroxide is not very soluble in water but dissolves slightly to make limewater

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14
Q

What is produced when claim hydroxide reacts with carbon dioxide?

A

Calcium carbonate is formed

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15
Q

How is cement made?

A

Limestone is mixed with clay and heated strongly

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16
Q

How is mortar made?

A

Cement is mixed with sand and water

17
Q

What are the differences between cement, mortar and concrete?

A

Cement is made from limestone and clay, it is used to make mortar. Mortar is cement mixed with sand and water and is used to hold bricks and blocks together. Concrete is cement mixed with sand water and aggregate used to make blocks, beans buildings and roads

18
Q

Ads of limestone quarrying

A

More employment opportunities
More customers and trade for local businesses
Improves roads

19
Q

Disadvantage of limestone quarrying

A

Dust and noise
More traffic
Loss of habitats for wildlife

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