IGCSE fractional distillation

Crude oil is know as a fossil fuel because

• It is found underground

• It takes millions of years to form

• It will run out one day

• It is made from dead animals and plants

Crude oil is known as a finite resource because

• It is found underground

• It takes millions of years to form

• It will run out one day

• it is made from dead plants and animals

Distillation is a technique which separates substances based on which physical property?

• density

• viscosity

• boiling point

• melting point

Which statement is untrue

• Crude oil contains a mixture of hydrocarbons

• Crude oil is made from alkenes

• Alkanes are saturated

• hydrocarbons only contain the elements hydrogen and carbon

A fraction is

• a group of alkanes with similar boiling points

• a group of alkanes with similar chemical properties

• a group of alkanes with the same general formula

• a group of different homologous series

Which of these is untrue about a fractional distillation column

• The column is hottest at the top and coolest at the bottom

• As the size of the molecules increases their boiling point increases

• As the size of the molecules increases the viscosity increases

• The column is hottest at the bottom and coolest at the top

The boiling of alkanes increases as they bigger because

• the strength of the metallic bonds increases

• the strength of the ionic bonds increases

• the strength of the covalent bonds increases

• the strength of the intermolecular forces increases

The fraction kerosine is used for

• Cars

• chemical industry

• lorries

• planes

the fraction naptha is used for

• cars

• the chemical industry

• lorries

• planes

which of these is untrue for alkanes

• They have the general formula C_nH_2n+2

• They only contain carbon-carbon single bonds

• They are very flammable

• They are hydrocarbons