Chemistry GCSE AQA revision

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  • Created by: percivalc
  • Created on: 14-05-15 22:20
What is the word equation for the oxydation of hydrogen?
hydrogen + oxygen -> hydrogen oxide
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What is the electronic structure of a carbon atom?
2 electrons on the inner shell and 4 electrons on the outer shell
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Name 2 products produced due to coal burning
Water and air pollution, waste managment
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What is hydration?
A chemical reation in which water is added to an unsaturated substence
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What is fermentation?
A metabolic process which converts suger into gasses, acids or alcahole
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What is an advantage of using bio-deisel instead of patrolium deisel?
Biodegradable, non toxic
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What is an disadvantage of using bio-deisel instead of patrolium deisel?
More expensive
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What is the bromine water test used for?
Testing for Alkenes; used to tell the difference between an alkane and an alkene
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Give two conclusions from the bromine water test
1. the more bromine decolourised the more unsaturated it is 2. bromine is saturated when the brownish colour starts to fade
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What is phytomining?
Phytomining is when some plants absorb compounds through their roots; the concentrate these compounds as a result
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Why can copper not be extracted by hand?
This is because copper is less reactive than carbon so needs to be extracted from its ore by heating it
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Why is scrap iron used to displace copper?
This is due to us running out of copper rich ores, iron is more reactive than copper so is used to remove the copper from copper salts
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What happens to copper during electrolysis?
The positive charged ions move to the the more negative charged electrode, they receive electrons and are reduced, the negative charged ions move to the positive charged electrode
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What products are formed when calcium carbonate is heated strongly?
Calcium oxide and carbon dioxide
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What is meant by the mean mass loss?
Add all the results togethor and divide them by the average or otal
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Why did scientists not accpet Wegeners theory?
Because he didnt have any evedence on how the continenets can move apart from eachother
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How does continental drift take place?
This is when the earths continents relevent to eachother start to 'drift' across the oceon bed
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Why does continental drift take place?
This is because of convection currants
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Why is carbon dioxide removed before gasses are cooled to -200'c?
This is because carbon dioxide freezes at -79'c
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What gas does not condense when remaining gasses are cooled to -200'c
Water vapour - has to be removed by filter paper
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The oxygen contains another gas in the process of fractional distilation what is it?
Argon
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What 2 types of hydrocarbons does polyethene contain?
Saturated and unsaturated
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How do you break down large hydrocarbon?
Using a very hot catalyst
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Why must air not enter the reactors?
This is because the reactors contain argon
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What method can be used to contain butene?
Cracking
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What method is used to seperate butene?
Fractional Distillation
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What is the diplayed sturcture of butene?
Diplayed structure:
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How do molecules of butene form polybutene?
The molecules of butene join together , this reaction is called polymerisation
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Other cards in this set

Card 2

Front

What is the electronic structure of a carbon atom?

Back

2 electrons on the inner shell and 4 electrons on the outer shell

Card 3

Front

Name 2 products produced due to coal burning

Back

Preview of the front of card 3

Card 4

Front

What is hydration?

Back

Preview of the front of card 4

Card 5

Front

What is fermentation?

Back

Preview of the front of card 5
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