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Chemistry > Limestone > Flashcards

Limestone Flashcards

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1
Q

What is the word equation for the thermal decomposition of limestone?

A

Calcium carbonate - Calcium Oxide + Carbon Dioxide

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2
Q

What is the symbol equation for the thermal decomposition of limestone?

A

CaCO3 - CaO + CO2

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3
Q

What other metal carbonates thermally decompose the same way as calcium?

A

Magnesium
Copper
Zinc
Sodium

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4
Q

What happens when a metal carbonate reacts with an acid?

A

A metal salt, carbon dioxide and water are formed

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5
Q

Give the word equation for when calcium carbonate reacts with sulfuric acid?

A

Calcium carbonate + sulfuric acid - calcium sulfate + carbon dioxide + water

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6
Q

What is the symbol equation when calcium carbonate reacts with sulfuric acid?

A

CaCO3 + H2SO4 - CaSO4 + CO2 + H2O

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7
Q

What is the word equation when calcium oxide reacts with water?

A

Calcium Oxide + Water - Calcium Hydroxide

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8
Q

What is the symbol equation when calcium oxide reacts with water?

A

CaO + H2O - Ca(OH)2

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9
Q

What is calcium hydroxide used for?

A

Calcium hydroxide is an alkali which can be used to neutralise acidic soils

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10
Q

Why is calcium hydroxide used for neutralising soils rather than powdered limestone?

A

Calcium hydroxide works much faster than powdered limestone

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11
Q

How is calcium hydroxide used to test for carbon dioxide?

A

Make a solution of calcium hydroxide in water, bubble a gas through, if carbon dioxide is present solution goes cloudy

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12
Q

Why does limewater go cloudy when carbon dioxide is present?

A

The cloudiness is caused by the formation of calcium carbonate

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13
Q

What is the word equation for the presence of carbon dioxide in limewater?

A

Calcium Hydroxide + Carbon Dioxide - Calcium Carbonate + Water

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14
Q

What is the symbol equation for the presence of carbon dioxide in limewater?

A

Ca(OH)2 + CO2 - CaCO + H2O

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15
Q

What is a use of limestone?

A

Limestone can be made into blocks for building with

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16
Q

How can cement be made from limestone?

A

Powdered limestone + Powdered clay heated in a kiln makes cement

17
Q

How is cement used to make mortar?

A

Cement mixed with sand and water creates mortar

18
Q

What is mortar?

A

The stuff you stick bricks together with

19
Q

How is cement used to make concrete?

A

Cemented mixed with sand and aggregate creates concrete

20
Q

What is aggregate?

A

Water and gravel

21
Q

Disadvantages of quarrying limestone

A 
Make huge ugly holes - landscape
A lot of noise and dust 
Destroys habitats
Transportation - noise, pollution and traffic
Waste materials - unsightly tips
22
Q

Disadvantage of making stuff from limestone

A

Cements factories make a lot of dust which can cause breathing problems
Energy is needed to produce cement&quicklime - energy comes from burning fossil fuels - pollution

23
Q

Advantages of quarrying limestone

A 
Makes houses and roads
Makes dyes, paints and medicines 
Neutralise acid soils and lakes 
Neutralise sulfur dioxide in powerstation chimney
Brings jobs and money to local economy
24
Q

Advantages of limestone as a product

A 
Widely Available 
Easy to cut 
Cheaper than granite or marble
More hard-wearing than marble 
Looks attractive
25
Q

Advantages and disadvantage of concrete

A

A: Can be moulded
A: Doesn’t corrode
D: Low tensile strength
D: Hideously unattractive

26
Q

What is an advantage of using limestone, cement and concrete?

A

They don’t rot when wet
Insects and rodents don’t gnaw them
Fire resistant

27
Q

How can you make concrete stronger?

A

Reinforce it with steel bars

Chemistry (8 decks)

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