C - Limestone Flashcards

1
Q

Limestone is mainly…

A

CALCIUM CARBONATE

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2
Q

What is thermal decomposition?

A

When one substance is HEATED and therefore CHEMICALLY CHANGES into at LEAST 2 new substances.

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3
Q

Limestone reacts with… (3)

A
  • Heat
  • Acid
  • Water
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4
Q

When limestone is thermally decomposed, it produces…

A
  • Calcium oxide

* Carbon dioxide

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5
Q

Calcium oxide and water produce _________ which is useful to test whether ________ is present. This is the ______test.

A
  • Calcium Hydroxide
  • Carbon dioxide
  • Limewater
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6
Q

Limestone can be used as building material such as… (2)

A
  • Mortar
  • Cement
  • Concrete
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7
Q

Extracting limestone is called…

A

Quarrying

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8
Q

What are some ( at least 2 ) disadvantages of quarrying limestone?

A
  • Huge ugly holes which permanently change the landscape
  • Noise and dust pollution
  • Destroys habitats
  • The limestone needs to be transported away from the quarry which causes more noise and pollution
  • Lots of energy, lots of money
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9
Q

What are some ( at least 2 ) advantages of quarrying limestone?

A
  • It’s useful - it provides things that people want e.g paints, houses, roads,medicines
  • Neutralises acidic soil
  • Provides jobs for people and brings more money to the local economy
  • Neutralises sulfur dioxide
  • Landscaping and restoration of the area is normally required as part of planning permission
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10
Q

What is the symbol for calcium carbonate?

A

CaCO3 - little 3

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11
Q

What’s the SYMBOL equation for Calcium carbonate when it’s thermally decomposing

A

CaCO3 ➡️ CaO + CO2

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12
Q

What’s the WORDY equation for Calcium carbonate when it’s thermally decomposing

A

Calcium carbonate ➡️ calcium oxide + carbon dioxide

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13
Q

What is the test that you do for detecting CO2

A

Limewater test

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14
Q

Describe the lime water test

A
  • calcium hydroxide solution is put into a test tube
  • A straw is exhaled into to create carbon dioxide to flow through the solution
  • This produces a cloudy white precipitate of calcium carbonate
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15
Q

What’s slaked lime?

A

Another word for calcium hydroxide

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16
Q

Calcium carbonate also reacts with acids such as sulfuric acid… say the wordy formula for this reaction

A

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

17
Q

Calcium carbonate breaks down when…

A

Heated strongly (thermal decomposition)

18
Q

What are the 3 other metal carbonates that decompose in the same way as calcium carbonate?

A
  • Sodium carbonate
  • Magnesium carbonate
  • Copper carbonate
19
Q

What is it called when limestone and sulfuric acid come into contact?

A

Acid rain

20
Q

The calcium oxide (produced by thermal decomposition) + water produces…

A

Calcium hydroxide

21
Q

What’s the symbol formula for producing calcium hydroxide

  • Doesn’t matter too much if you can’t get this
A

CaO + H20 ➡️ Ca(OH)2

22
Q

What are the two uses of calcium hydroxide?

A
  • It can be used to NEUTRALISE acidic soil

* It can be used to test for CO2

23
Q

Calcium hydroxide is an ______ which can be used to _________ acidic soil in fields

A

Alkali

Neutralise

24
Q

Why are some metals difficult to decompose in a classroom environment?

A

Because they are too high up in the reactivity series and so they’d need more heat energy than a Bunsen burner

25
Q

What’s quicklime?

A

The product created after the thermal decomposition on CaCO3