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Chemistry Unit 1 > Limestone > Flashcards

Limestone Flashcards

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1
Q

Why do we quarry large amounts of limestone rock?

A

Because it has many uses

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2
Q

What is limestone mainly made of?

A

Calcium carbonate

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3
Q

What are the three uses of limestone?

A

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

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4
Q

What does the decomposition of calcium carbonate make?

A

Calcium oxide (CaO) and carbon dioxide (CO2)

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5
Q

How is concrete made?

A

By mixing cement with sand, aggregate and water

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6
Q

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

A

Thermal decomposition reaction

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7
Q

How is cement made?

A

By mixing clay and limestone in a kiln

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8
Q

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

A

Magnesium carbonate. zinc carbonate, copper carbonate, sodium carbonate

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9
Q

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

A

A metal oxide and carbon dioxide

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10
Q

What do all carbonates react with?

A

Acid

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11
Q

What happens when carbonates react with an acid?

A

They produce salt, water and carbon dioxide

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12
Q

Why is limestone damaged by acid rain?

A

Because the calcium carbonate reacts with the acid in the rain

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13
Q

What is the proper name for limewater?

A

Calcium hydroxide solution

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14
Q

What is limewater used to test for?

A

Carbon dioxide

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15
Q

What happens in a test for carbon dioxide?

A

If carbon dioxide is present the limewater will turn cloudy

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16
Q

Why does carbon dioxide make limewater go cloudy?

A

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

17
Q

What does reacting magnesium with hydrochloric acid make?

A

Magnesium chloride (salt), water and carbon dioxide

18
Q

What are the products when zinc carbonate is heated strongly?

A

Zinc oxide and carbon dioxide

19
Q

What is produced when water is added to calcium oxide?

A

Calcium hydroxide

20
Q

How is calcium hydroxide made?

A

By adding water to calcium oxide

21
Q

Is calcium hydroxide an acid or an alkali?

A

An alkali

22
Q

What can calcium hydroxide be used to do?

A

Neutralise acids

23
Q

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

A

It is used by farmers to neutralise acidic soil

24
Q

What does calcium hydroxide react with to produce?

A

Calcium hydroxide reacts with carbon dioxide to produce calcium carbonate

25
Q

How is calcium carbonate made?

A

By adding carbon dioxide to calcium hydroxide

26
Q

Describe the limestone cycle.

A

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.

27
Q

How is mortar made?

A

By mixing cement with sand and water

28
Q

What are the three advantages of quarrying for limestone?

A

More employment, improved roads, more trade for local businesses

29
Q

What are three disadvantages of quarrying for limestone?

A

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

30
Q

What is a disadvantage of making cement?

A

It uses a large area of land and energy

Chemistry Unit 1 (40 decks)

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