Using Limestone Flashcards

1
Q

Limestone is mainly what?

A

Calcium carbonate.

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2
Q

Where does limestone come from?

A

Quarried out of the ground.

Formed from sea shells.

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3
Q

What is limestone good for making?

A

Blocks for building.

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4
Q

What buildings are usually made out of limestone?

A

Cathedrals made purely from limestone.

As its sturdy.

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5
Q

What is the equation for calcium carbonate?

A

CaCO3.

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6
Q

What happens when calcium carbonate is heated?

A

It thermally decomposes.

Makes calcium oxide and carbon dioxide.

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7
Q

What is thermal decomposition?

A

When one substance chemically changes into at least 2 new substances when heated.

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8
Q

Give the equation for

calcium carbonate——–> calcium oxide + carbon dioxide.

A

CaCO3 —->Ca0 + CO2.

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9
Q

Same 4 other substances which thermally decompose in the same way.

A

Sodium carbonates.
Magnesium.
Copper.
Zinc.

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10
Q

When heated what does magnesium carbonate make?

A

Magnesium oxide and carbon dioxide.

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11
Q

What can’t a bunsen burner do?

A

Reach high enough temperatures to thermally decompose some carbonates in Group 1 metals.

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12
Q

Calcium carbonate reaches with acid to produce what?

A

Calcium salt.
Carbon dioxide.
Water.

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13
Q

The type of salt produced depends on what?

A

The type of acid used.

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14
Q

If hydrocholric acid was used what type of salt would be produced?

A

Chloride.

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15
Q

Name other carbonates which react with acid.

A

Magnesium.
Copper.
Zinc.
Sodium.

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16
Q

What is limestone damaged by?

A

Acid rain.

17
Q

What equation shows limestone is damaged by acid rain?

A

Calcium carbonate+Sulphuric acic —–> Calcium sulfate +carbon dioxide + water.

18
Q

Calcium oxide reacts with water to produce what?

A

Calcium hydroxide.

19
Q

What is calcium hydroxide?

A

An alkali used to neutralise acidic soil in a field.

Powered limestone can be used for this too.

20
Q

Advantage of using calcium hydroxide is what?

A

It works quick.

21
Q

What can calcium hydroxide be used to test for?

A

Carbon dioxide.

22
Q

If you make a solution of calcium hydroxide in water what will happen?

A

If you bubble gas through it, it will turn cloudy if there’s carbon dioxide in the gas.

23
Q

What is the cloudiness caused by?

A

Formation of calcium carbonate.

24
Q

What is the equation for the lime water test/cloudy water?

A

calcium hydroxide + carbon dioxide —-> calcium carbonate + water.

25
Q

Powered limestone is heated in what to make what?

A

A kiln.

With powered clay to make cement.

26
Q

Have is a mortar made?

A

Cement mixed with sand and water.

27
Q

What is mortar?

A

The stuff you stick bricks together with.

28
Q

What can you also add to a motar?

A

Calcium hydroxide.

29
Q

How do you make concrete?

A

Mixing sand and aggregate together.