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Chemistry - Unit One > Limestone > Flashcards

Limestone Flashcards

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1
Q

How do we get limestone?

A

It is quarried from the ground.

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2
Q

What is the chemical symbol for limestone?

A

CaCO

3

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3
Q

What is thermal decomposition?

A

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

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4
Q

What are the products of the thermal decomposition of limestone?

A

Calcium Oxide and Carbon Dioxide

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5
Q

What are the products of reacting calcium carbonate with an acid?

A

Calcium salt, carbon dioxide and water.

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6
Q

How do you know which calcium salt is produced when reacting calcium carbonate with an acid?

A

The name of the acid. You take the first part and put it on the end of the salt. For example, Sulphuric Acid reacts to give Calcium Sulphate.

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7
Q

What is formed when water is added to Calcium Oxide?

A

It becomes Calcium Hydroxide.

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8
Q

What happens to Calcium Hydroxide when an excess of water is added?

A

It dissolves.

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9
Q

Is Calcium Hydroxide an acid or an alkali?

A

Alkali

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10
Q

What is Calcium Hydroxide commonly used for?

A

Neutralisation of ground and water

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11
Q

What happens when Calcium Hydroxide and Carbon Dioxide react?

A

Limestone and water are produced.

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12
Q

How can we use Calcium Hydroxide solution to test for Carbon Dioxide?

A

You bubble a gas through the solution. If it turns cloudy, Carbon Dioxide is present.

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13
Q

How is cement made?

A

Powdered limestone is heated in a kiln with powdered clay.

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14
Q

How is mortar made?

A

Cement is mixed with water and sand.

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15
Q

How is concrete made?

A

Cement is mixed with sand, gravel and water.

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16
Q

Why is limestone a good building material?

A

Because it is easy to shape and hard-wearing.

17
Q

Why are cement, mortar and concrete good building materials?

A

They don’t rot, burn or get gnarled by insects and rodents.

18
Q

What are uses of limestone apart from making building materials?

A
  • Used in dyes, paints and medicines
  • Neutralising acidic soil and water
  • Used in power station chimneys to neutralise Sulphur Dioxide
19
Q

What problems are associated with quarrying limestone?

A
  • Huge holes made in landscape
  • Destroys habitats
  • Transporting limestone pollutes environment
  • Waste materials go to landfill
20
Q

What problems are associated with limestone products?

A
  • Cement factories produce dust
  • Energy is required to produce cement
  • Concrete is ugly

Chemistry - Unit One (7 decks)

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