C1

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Describe what happens in a polymerisation reaction.
Many ethenes / monomers bond / join together.
1 of 10
Suggest why, in 1920, other scientists thought that Wegener’s hypothesis of continental drift was wrong.
Other scientists thought that continents are fixed or Wegener had no evidence to prove that continents can move. A land bridge could explain the similar fossils on the continents of South America and Africa.
2 of 10
What are the stages in the limestone cycle?
Calcium carbonate (heat) - Calcium oxide (add water) - calcium hydroxide (add more water) - calcium hydroxide solution (add carbon dioxide) - calcium carbonate.
3 of 10
Suggest one reason why concrete is stronger than mortar.
Contains aggregate (bonding is stronger)
4 of 10
How can you test for alkenes?
By adding the substance to bromine water, the alkene will decolourise the bromine water to change from orange to colourless as the double bond has opened up and formed bonds with the bromine.
5 of 10
How is ethanol produced from ethane?
Ethene can be hydrated with steam in the presence of a catalyst to make ethanol.
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What is hydrogenation?
Unsaturated vegetable oils hardened by reacting them with hydrogen in presence of a nickel catalyst at 60 degrees–this is hydrogenation as hydrogen reacts with double-bonded carbons so opens out double bonds. This makes a lot of trans fats-unhealthy.
7 of 10
What are the advantages of plastic bags made from polyethene?
Strong/low density/water resistant. Bags can be reused. Money charged for bags go to good causes (encourage reuse). Bags can be recycled (into milk bottle crates). Bags burnt to provide heat for buildings/electricity. New bags are now biodegradable.
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What are the disadvantages of plastic bags made from polyethene?
Long time to biodegrade. Shortage of landfill space. Made from crude oil-non-renewable. Lots of energy used producing poly(ethene). Producing poly(ethene) and burning release CO2/causes global warming. Litter-visual pollution, effects wildlife.
9 of 10
Why did the percentage of carbon dioxide decrease in the Earth's early atmosphere?
Carbon dioxide dissolves in water/oceans. Marine organisms use (dissolved) carbon dioxide to form their shells/skeletons. Plants / algae photosynthesise/ absorb/use carbon dioxide.
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Other cards in this set

Card 2

Front

Suggest why, in 1920, other scientists thought that Wegener’s hypothesis of continental drift was wrong.

Back

Other scientists thought that continents are fixed or Wegener had no evidence to prove that continents can move. A land bridge could explain the similar fossils on the continents of South America and Africa.

Card 3

Front

What are the stages in the limestone cycle?

Back

Preview of the front of card 3

Card 4

Front

Suggest one reason why concrete is stronger than mortar.

Back

Preview of the front of card 4

Card 5

Front

How can you test for alkenes?

Back

Preview of the front of card 5
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