WorksheetsHydrocarbons
Total questions: 20
Worksheet time: 40mins
Compounds made only of carbon and hydrogen atoms are called ______________.
hydrocarbons
hydrogencarbonates
carbohydrates
A substance with a high boiling point . . .
changes rapidly from a liquid to a gas at a low temperature.
changes rapidly from a liquid to a gas at a high temperature.
flows easily.
doesn't flow easily.
is easy to ignite and burn.
The boiling point of hydrocarbons . . .
increases with increasing molecular size.
decreases with increasing molecular size.
is not affected by molecular size.
The viscosity of hydrocarbons depends on the size of their molecules. What is viscosity?
a measure of how difficult it is for a substance to flow
a measure of how easy it is to ignite and burn
a substance the temperature at which a substance rapidly changes state from a liquid to a gas
A substance with a low viscosity . . .
evaporates at a low temperature.
evaporates at a high temperature.
flows easily.
doesn't flow easily.
is easy to ignite and burn.
The flammability of hydrocarbons depends on the size of their molecules. What is flammability?
a measure of how difficult it is for a substance to flow
a measure of how easy it is to ignite and burn
a substance the temperature at which a substance rapidly changes state from a liquid to a gas
A highly flammable substance . . .
evaporates at a high temperature.
flows easily.
doesn't flow easily.
is easy to ignite and burn.
is difficult to ignite and burn
Crude oil is a mixture of a very large number of compounds. Most of the compounds in crude oil are hydrocarbons. What is a hydrocarbon?
a compound that contains only hydrogen and carbon atoms
a compound that contains hydrogen, carbon and other elements
a compound with a carbon backbone
Where is crude oil found?
between layers of impermeable rock
as seams of rock
in the atmosphere
What was crude oil formed from?
plankton
plants
carbon dioxide
Where in the fractionating column do the hydrocarbons with the highest boiling points condense?
at the top of the fractionating column
in the middle of the fractionating column
at the bottom of the fractionating column
What happens to the vapours of crude oil as they rise up through the fractionating column?
They heat up and evaporate.
They cool and condense.
They heat up and melt.
They cool and freeze.
How does fuel oil compare to petrol?
Select two statements.
Fuel oil has a higher boiling point than petrol.
Fuel oil has a lower boiling point than petrol.
Fuel oil contains larger hydrocarbon molecules than petrol.
Fuel oil contains smaller hydrocarbon molecules than petrol.
Which two of the following molecules are hydrocarbons?
carbon dioxide
methane
ethanol
butene
Which alkane has the formula CH4?
methane
ethane
propane
butane
Which alkane is represented by the structural formula shown?
methane
ethane
propane
butane
One molecule of pentane contains 5 carbon atoms. What is the molecular formula for pentane?
C₅H₁₂
C₅H₁₀
C₅H₈
C₅H₁₄
Combustion is a scientific term for ________.
burning
dissolving
rusting
Select the correct word equation for the combustion of a fuel.
A
A
B
C
The products of the combustion reaction are bubbled through limewater. Which gas is limewater used to test for?
oxygen
hydrogen
carbon dioxide
chlorine
