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Chemistry 3 > Limestone > Flashcards

Limestone Flashcards

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1
Q

What is limestone needed for?

A

Making glass, cement and concrete

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2
Q

What is limestone used for?

A

In farming to neutralise soil acidity, and so increase the pH of the soil; in industry, producing iron and steel and when building roads

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3
Q

How is limestone extracted from the ground?

A

Quarrying

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4
Q

What happens to calcium carbonate on heating?

A

It undergoes thermal decomposition to for

m calcium oxide

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5
Q

What is another term for calcium oxide that is produced by thermal decomposition of calcium carbonate?

A

Quicklime

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6
Q

What is also released on the thermal decomposition of calcium carbonate, forming calcium oxide?

A

Carbon dioxide

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7
Q

How does calcium oxide react with water?

A

Exothermically

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8
Q

What is created when calcium oxide reacts with water?

A

Calcium hydroxide

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9
Q

What is another term for calcium hydroxide, produced by reacting calcium oxide with water?

A

Slaked lime

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10
Q

Describe the appearance before, during and after copper carbonate being heated strongly

A

Before: green

During: solid, turning black

After: Black

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11
Q

Describe the appearance before, during and after calcium carbonate being strongly heated

A

Before: White

During:

After: White

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12
Q

Name the carbonates, in order, that decompose from quickest to slowest

A

Copper carbonate, calcium carbonate, sodium carbonate

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13
Q

What gas is formed when carbonates decompose?

A

Carbon dioxide

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14
Q

How is limestone used in the production of iron?

A

It reacts with impurities to produce slag

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15
Q

What happens when water is added to calcium oxide?

A

It steams and expands, and heat is given off

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16
Q

What colour does universal indicator turn when calcium hydroxide is added?

A

Dark blue

17
Q

What is formed when limewater reacts with carbon dioxide?

A

Calcium carbonate and water

18
Q

What happens if more carbon dioxide is added to limewater? Why?

A

The solution becomes transparent again as the calcium carbonate has reacted to become calcium hydrogen carbonate

19
Q

Give a social advantage and disadvantage of quarrying

A

Advantage: Provides jobs for local people

Disadvantage: Creates noise and pollution dust

20
Q

Give an economic advantage and disadvantage of quarrying

A

Advantage: Building is an important part of Britain’s economy

Disadvantage: None

21
Q

Give an environmental advantage and disadvantage of quarrying

A

Advantage: Disused quarries can be used as landfill sites

Disadvantage: Quarrying scars the landscape

22
Q

What is limestone?

A

A rock formed mainly of calcium carbonate, CaCO3

Chemistry 3 (4 decks)

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