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WorksheetsAlkanes and alkenes
Total questions: 15
Worksheet time: 9mins
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
What is the name of this molecule?
But-1-ene
Prop-2-ene
Pent-2-ene
Hex-3-ene
What are the conditions needed for cracking?
Catalyst: silica. Temperature: 20C
Catalyst: iron. Temperature: 600-700C
Catalyst: silica. Temperature: 600-700C
Catalyst: iron. Temperature: 20C
Why is cracking done?
Because longer alkanes are more useful than shorter alkanes
Because shorter alkanes are more useful than longer alkanes
Crude oil must be separated as the mixture of molecules is no use
Because the alkenes produced are useful to make plastics with
Which of these statements are true about alkenes?
They are unsaturated
They have the general formula CnH2n
They have a C=C
They decolourise bromine water
Out of alkanes and alkenes, which are more reactive and why?
Alkanes, because they are more flammable
Alkanes, because C-C are more easily broken than C=C
Alkenes, because C=C are more easily broken than C-C
Alkenes, because they have lost electrons to become ions
