Chemistry - Chapter 4 (P3) + Chapter 5

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What does cracking mean?
Spiltting up long-chain hydrocarbons
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Why is cracking used?
Cracking is used to turn longer chains into smaller ones
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What do you need to make cracking?
Heat and a catalyst
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Cracking is a ______________ _______________ reaction.
Thermal decomposition
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What are alkenes?
Alkenes are hydrocarbons; with a double bond
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Are alkenes saturated or unstaurated?
They are unsaturated
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Name the first four alkenes
Ethene, propane, butene, pentene
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How can you test for an alkene?
Bromine water
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What is thermal decomposition?
Breaking down a substance using heat
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What do alkenes have that alkanes don't?
They have a double bond
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What happens to the bromine water, when alkene is added?
Decolourise; which shows that it is an alkene
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Why can polymers be difficult to dispose of?
They do not break down easily (not biodegradable)
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What is formed when ethene reacts with steam?
Only Ethanol
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What is one of the advantages of making ethanol by fermentation?
The plant material is a renewable resource.
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Properties of plastics
Light weight, high resistance to various chemicals, unreactive
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Why are plastics useful?
Their unreactivity makes them durable
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Why are plastics a problem?
They are not biodegradable
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What are the three ways to dispose of waste plastics?
1) Landfill 2) Recycling 3) Combustion
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Other cards in this set

Card 2

Front

Why is cracking used?

Back

Cracking is used to turn longer chains into smaller ones

Card 3

Front

What do you need to make cracking?

Back

Preview of the front of card 3

Card 4

Front

Cracking is a ______________ _______________ reaction.

Back

Preview of the front of card 4

Card 5

Front

What are alkenes?

Back

Preview of the front of card 5
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