Cracking allows large hydrocarbon molecules to be broken down into smaller, more useful hydrocarbon molecules.
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What does cracking involve?
Fractions containing large hydrocarbon molecules are heated to vaporise them. They are then either 1) passed over a hot catalyst 2) mixed with steam and heated at a high temperature
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What are alkanes and alkenes?
Small hydrocarbons made as a result of cracking
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What are alkenes used for?
They are used to make polymers used for the plastic industry
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What is the general formula for alkene hydrocarbons?
CnH2n
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What does the general formula mean?
The number of hydrogen atoms in an alkene is double the number of carbon atoms
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What are polymers?
Polymers are very large molecules made when many smaller molecules join together, end-to-end.
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What are the smaller molecules made from polymers called?
Monomers
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Are all polymers used for the same thing?
NO! They all have different properties and therefore are used for different things in industry
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List some of the uses of the modern polymers.
1) New packaging 2) Fillings for teeth 3) Dressings for cuts 4) Materials 5)Waterproof coating for materials 6) Hydrogels
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Are polymers reactive?
NO! they are very unreactive
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Name an advantage and disadvantage of Polymers being unreactive.
Advantage: Useful for food storage Disadvantage: Makes it difficult to dispose of polymers
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What do Ethanol molecules contain?
Carbon, hydrogen and oxygen atoms
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What is Ethanol useful for?
It is useful as fuel
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What is Ethanol usually added to if used as fuel in a car/vehicle?
Petrol
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Other cards in this set
Card 2
Front
What does cracking involve?
Back
Fractions containing large hydrocarbon molecules are heated to vaporise them. They are then either 1) passed over a hot catalyst 2) mixed with steam and heated at a high temperature
Card 3
Front
What are alkanes and alkenes?
Back
Card 4
Front
What are alkenes used for?
Back
Card 5
Front
What is the general formula for alkene hydrocarbons?
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