CHEMISTRY

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  • Created by: pika_kos
  • Created on: 17-01-14 16:15
Test for carbon dioxide?
Limewater turns cloudy in the presence of carbon dioxide.
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Why does limewater turn cloudy when in contact with carbon dioxide?
White precipitate forms.
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Limewater word equation?
calcium oxide + water = calcium hydroxide.
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Limewater chemical equation?
CaO + H2O = Ca(OH)2
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What uses are there for limestone to neutralize acids?
Soils, coal-fired power stations.
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Limewater and carbon dioxide chemical equation?
Ca(OH)2 + CO2 = CaCO3 +H2O
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How do indigestion tablets work? (2)
Neutralize excess acid in the stomach.
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How were the oceans formed? (2)
The water vapour released from volcanoes condensed and it rained for millions of years forming the oceans.
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How was carbon dioxide in the early atmosphere decreased? (2)
Plants evolved and photosynthesized, oceans absorbed carbon dioxide.
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How are humans releasing carbon dioxide?
Burning fossil fuels, deforestation, livestock farming.
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Why are resources for finding out the composition of the early atmosphere limited?
No one was there at the time.
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How can you find out the proportion of oxygen in the air?
If you heat up copper in a tube and air over it using two syringes, you can use the markers on the syringes to tell how much oxygen has been used up.
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How was the ozone layer created?
In the early atmosphere oxygen created a layer of oxygen in the atmosphere.
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What does the ozone layer do?
It blocks harmful rays from the sun and enables more complex organisms to evolve.
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What gases did the volcanoes release in the early atmosphere?
Carbon dioxide, argon, water vapour, sulfur dioxide.
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How can we find out what the gases were in the early atmosphere?
Bubble of air trapped in Antarctic ice?
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Other cards in this set

Card 2

Front

Why does limewater turn cloudy when in contact with carbon dioxide?

Back

White precipitate forms.

Card 3

Front

Limewater word equation?

Back

Preview of the front of card 3

Card 4

Front

Limewater chemical equation?

Back

Preview of the front of card 4

Card 5

Front

What uses are there for limestone to neutralize acids?

Back

Preview of the front of card 5
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