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WorksheetsAQA GCSE CHEMISTRY - ORGANIC CHEMISTRY
Total questions: 17
Worksheet time: 9mins
What is the name of the alkane with two carbon atoms?
Ethane
Methane
Butane
Propane
What chemicals are found in crude oil?
Methane only
A mixture of compounds, which are mostly hydrocarbons
A mixture of elements
Carbon only
What is the definition of a hydrocarbon?
A compound made of hydrogen and carbon only
A compound that includes hydrogen or carbon
A mixture that includes hydrogen and carbon
A mixture of hydrogen and carbon only
What is the first stage in the fractional distillation of crude oil?
Heating, to vaporise the hydrocarbons
Heating, to make it a hot liquid
Cooling it
Separating the fractions
What happens to the viscosity of hydrocarbons as the length of the molecule increases?
Longer hydrocarbons are more viscous
All hydrocarbons have the same viscosity
Hydrocarbons aren’t viscous
Shorter hydrocarbons are more viscous
What compounds are produced in the complete combustion of hydrocarbons?
Carbon dioxide and water
Carbon monoxide and water
Carbon dioxide and nitrogen
Water and nitrogen
The alkanes are a homologous series.
What is the general formula of the alkanes?
n carbon atoms, 2n hydrogen atoms
2n carbon atoms, n hydrogen atoms
n carbon atoms, n+2 hydrogen atoms
n carbon atoms, 2n+2 hydrogen atoms
What property allows us to separate hydrocarbons during fractional distillation?
Different hydrocarbons have different boiling points
Different hydrocarbons have different melting points
Different hydrocarbons are different colours
Some hydrocarbons have a positive charge and others have a negative charge
Which is the best description of fractional distillation?
Breaking down longer hydrocarbon chains into smaller ones that are more useful
Separating the hydrocarbons in crude oil into fractions, with each fraction containing molecules with a similar number of carbon atoms
Pumping crude oil out from under the sea
Ensuring resources are used to meet the needs of current generations without compromising the needs of future generations
Crude oil is finite because we use it before more can be formed.
How was crude oil formed?
From the remains of an ancient biomass, consisting mainly of plankton, that was buried in mud
Mostly from the remains of dinosaur bones
By fractional distillation
By cracking
Why, in terms of column temperature, do the fractions condense at different levels in the fractionating column?
The column is hotter at the bottom and cooler at the top
The column is cooler at the bottom and hotter at the top
All the column is at the same temperature
The column has a hotter section halfway up
What happens to the boiling point and flammability of hydrocarbons as the length of the molecules increases?
Longer hydrocarbons have lower boiling points and are less flammable
Longer hydrocarbons have higher boiling points and are more flammable
Longer hydrocarbons have lower boiling points and are more flammable
Longer hydrocarbons have higher boiling points and are less flammable
Hydrocarbons with shorter carbon chains are more flammable.
What does this make them useful for?
Lubricants
Fuels
Plastics
Feedstock
How many carbon atoms and hydrogen atoms are there in propane?
2 carbon atoms, 6 hydrogen atoms
4 carbon atoms, 8 hydrogen atoms
3 carbon atoms, 8 hydrogen atoms
3 carbon atoms, 6 hydrogen atoms
Put the two processes used in fractional distillation in the correct order.
Evaporating and then melting
Evaporating and then condensing
Condensing and then evaporating
Melting and then condensing
Which substances can be produced from crude oil?
Metal alloys and glass
Glass and concrete
Limestone and steel
Kerosene and polymers
What happens to carbon and hydrogen during combustion reactions?
They are reduced
They are oxidised
They are cracked
They are distilled
