WorksheetsHydrocarbon
Total questions: 25
Worksheet time: 25mins
Compounds made only of carbon and hydrogen atoms are called ______________.
hydrocarbons
hydrogencarbonates
carbohydrates
The boiling point of hydrocarbons . . .
increases with increasing molecular size.
decreases with increasing molecular size.
is not affected by molecular size.
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
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
Which of the following is a use of hydrocarbons?
As a food additive
In the production of plastics
As a buffering agent in pharmaceuticals
As a primary ingredient in glass manufacturing
What is the main type of reaction undergone by alkanes?
Addition
Substitution
Elimination
Condensation
What is the process called when a large alkane is broken down into smaller alkanes and alkenes?
Polymerization
Hydrogenation
Cracking
Halogenation
What is the general formula for alkanes?
CnH2n+2
CnH2n
CnHn+1
CnH2n−2
Where is crude oil found?
between layers of impermeable rock
as seams of rock
in the atmosphere
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.
Which two of the following molecules are hydrocarbons?
carbon dioxide
methane
ethanol
butene
Which alkane has the formula CH4?
methane
ethane
propane
butane
One molecule of pentane contains 5 carbon atoms. What is the molecular formula for pentane?
C₅H₁₂
C₅H₁₀
C₅H₈
C₅H₁₄
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
How does fuel oil compare to petrol?
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.
Select the correct word equation for the combustion of a fuel.
A
B
C
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
How many bonds are there between the carbon atoms in unsaturated hydrocarbons?
1
2
3
2 or 3
Name this alkane
Methane
Ethane
Propane
Butane
Which of the following is a characteristic of aromatic hydrocarbons?
They contain only single bonds
They have a ring structure with delocalized electrons
They are always saturated
They are always aliphatic
What is the primary use of hydrocarbons in the energy sector?
As a coolant
As a lubricant
As a fuel
As a solvent
Which process is used to convert unsaturated hydrocarbons to saturated hydrocarbons?
Hydration
Hydrogenation
Halogenation
Hydrolysis
