Alkanes and alkenes

What is meant by a hydrocarbon?

• A molecule containing hydrogen atoms only

• A molecule containing carbon atoms only

• A molecule containing hydrogen and carbon atoms

• A molecule containing only hydrogen and carbon atoms

Alkanes are...

• Saturated, have the general formula CnH2n

• Saturated, have the general formula CnH2n+2

• Unsaturated, have the general formula CnH2n

• Unsaturated, have the general formula CnH2n+2

An alkane with three carbons is know as...

• Propane

• Propene

• Pentane

• Pentene

What is meant by an isomer?

• A molecule with the same structural formula but a different displayed formula

• A molecule with the same displayed formula but a different molecular formula

• A molecule with the same structural formula but a different molecular formula

• A molecule with the same molecular formula but a different displayed formula

What is meant by a homologous series?

• A family of compounds with similar chemical properties and the same general formula

• The method for separating the different length alkanes

• The process for turning alkanes into alkenes

• Where two compounds have the same displayed formula

In fractional distillation of crude oil, the fractions at the top of the column are:

• Smaller molecules

• Lighter in colour

• More viscous

• Higher in boiling point

Going in order from the top of the column, the fractions are:

• Gases, diesel, bitumen, fuel oil, petrol, kerosene

• Gases, petrol, fuel oil, diesel, kerosene, bitumen

• Gases, gasoline, kerosene, diesel, fuel oil, bitumen

• Gases, kerosene, diesel, petrol, bitumen, fuel oil

Complete combustion of alkanes could release:

• Carbon dioxide, carbon (soot) and water

• Carbon monoxide and water

• Carbon dioxide and water

• Carbon (soot), carbon monoxide and water

What problem is caused by both sulphur dioxide and nitrogen oxides?

• Global dimming

• Acid rain

• Global warming

• Toxic; stops haemoglobin transporting oxygen efficiently

How are nitrogen oxides produced when burning fuels?

• The nitrogen impurities in the fuel react with oxygen from the air

• By complete combustion

• By nitrogen and oxygen in the air reacting together at high temperatures

• By incomplete combustion