Understanding Hydrocarbons and Cracking

What is crude oil primarily composed of?

• Water and minerals

• Hydrocarbons

• Metals

• Salts

Which type of hydrocarbons have a lower boiling point?

• Large hydrocarbons

• Small hydrocarbons

• Medium hydrocarbons

• All hydrocarbons have the same boiling point

Why are smaller hydrocarbons more useful as fuels?

• They are heavier

• They are more volatile and easier to ignite

• They are more stable

• They are less volatile

What is the process called that breaks down long chain alkanes into smaller molecules?

• Distillation

• Cracking

• Polymerisation

• Combustion

What are the products of cracking long chain alkanes?

• Only alkanes

• Only alkenes

• A smaller alkane and an alkene

• Water and carbon dioxide

Why is there a high demand for small chain hydrocarbons?

• They are used in making plastics

• They are better fuels

• They are used in construction

• They are used in making medicines

What is the main use of alkenes produced from cracking?

• As a fuel

• In the manufacture of chemicals

• As a food additive

• As a cleaning agent

Which of the following is NOT a use of fuels in our daily lives?

• Driving cars

• Heating homes

• Making clothes

• Flying aeroplanes

What happens to the boiling point as the carbon chain length increases?

• It decreases

• It remains the same

• It increases

• It fluctuates

What is the primary reason for using fractional distillation in processing crude oil?

• To separate metals from oil

• To separate hydrocarbons based on boiling points

• To add impurities to the oil

• To convert oil into water