Chemistry 3-Limestone

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What happens to metal carbonates when they are heated strongly?
They break down
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Define Thermal Decomposition
When a compound splits into two or more materials by heat
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How can thermal decomposition rate be investigated?
Timing the colour change- limewater from clear to cloudy
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What is the colour of sodium, calcium and copper before heating?
White, white and green
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What are the new colours of sodium, copper and calcium after heating?
White, white and black
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What gases are evolved from the heating of sodium, calcium and copper?
None, carbon dioxide and carbon dioxide.
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What is the ease of the decomposition of sodium, calcium and copper?
Very difficult, fairly easy and easy
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Why is a reaction for sodium carbonate so difficult to achieve?
The more reactive the metal, the more stable the carbonate and vice versa for an unreactive metal
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Describe Stage 1 of the limestone cycle
Limestone is roasted for 20 minutes, the limestone glows and crumbles, decomposing to calcium oxide or QUICKLIME
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Describe stage 2 of the limestone cycle
A few drops of water is added to quicklime, sizzling and steam is released- and exothermic reaction. This produces calcium hydroxide, SLAKED LIME
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Describe stage 3 of the limestone cycle
Excess water is added to slaked lime, it dissolves to produce limewater
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How would you get limewater back to limestone?
React with Carbon dioxide, giving an insoluble calcium carbonate in milky limewater
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How can limestone be used in society?
Important raw material for the production of steel and iron, used on roads, making cement and glass
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How is limestone sourced?
Quarrying
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What are the disadvantages of Quarrying limestone?
Formation of dust, destruction of land and environment, noise and unsightly landscape.
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Other cards in this set

Card 2

Front

Define Thermal Decomposition

Back

When a compound splits into two or more materials by heat

Card 3

Front

How can thermal decomposition rate be investigated?

Back

Preview of the front of card 3

Card 4

Front

What is the colour of sodium, calcium and copper before heating?

Back

Preview of the front of card 4

Card 5

Front

What are the new colours of sodium, copper and calcium after heating?

Back

Preview of the front of card 5
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