Topic 3

Question 1

What is complete combustion?

Answer 1

Complete combustion occurs when all the hydrocarbons are oxidised and the only product left is carbon dioxide and water
Complete combustion only happen when lots of oxygen is present

Question 2

What in incomplete combustion?

Answer 2

Incomplete combustion occurs when their is not enough oxygen for all the reactants to oxide in this case is forms

• Carbon Dioxide
• Carbon Monoxide
• Carbon
• Water

Question 3

What properties should a good fuel have?

Answer 3

• Burn easily
• Shouldn’t produce ash or smoke
• Should release a lot of heat energy
• Should be easy to store and transport

Question 4

What are alkanes?

Answer 4

They are saturated hydrocarbons. This means that all the bonds joining them are single bonds

Question 5

What are alkenes?

Answer 5

They are unsaturated hydrocarbons and have at least one double bond

Question 6

What is the bromine test?

Answer 6

The bromine test is used to find out if a liquid contains a double bond. Bromine is an orange liquid but becomes colourless when mixed with unsaturated molecules

Question 7

What is cracking?

Answer 7

Cracking the process of breaking down long chains of alkanes into shorter more useful chains

Question 8

What are some properties and uses of poly(ethene)

Answer 8

Flexible, cheap, good electrical insulator

Plastic bags, Bottles and clingfilm

Question 9

What are some properties and uses of poly(propene)

Answer 9

Flexible, shatterproof, has a high softening point

Buckets and bowls

Question 10

What are some properties and uses of Poly(chloroethene) (PVC)?

Answer 10

Tough, cheap, long lasting electrical insulator

Window frames, gutters and pipes, wire insulation

Question 11

What are some properties and uses of PTFE?

Answer 11

Tough, slippery, resistant to corrosion, electrical insulator
Non stick coatings, Corrosive containers, Stain proof carpets, wire insulation