What is the name of the alkane with two carbon atoms?

• Ethane

• Methane

• Butane

• Propane

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

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

Describe the melting and boiling points of pure substances

• Range of temperature
• Fixed
• Different temperature
• One very specific temperature

In paper chromatography, what is the mobile phase?

• Pencil line
• Paper
• Ink
• Solvent e.g. water

What does a substance's Rf value depend on?

• Solubility
• Gravity
• Size of compound
• Colour

In chromatography, why is a pencil used to draw the line?

• It’s insoluble
• It's soluble
• It's sharper
• Neutral colour

Why is distilling sea water to make drinking water expensive?

• uses a lot of chemicals
• it's slow
• needs expensive equipment
• takes lots of time
• takes a lot of energy

What group are the Halogens in?

• Group 1

• Group 2

• Group 7

• Group 0

What group are the Noble Gases in?

• Group 1

• Group 2

• Group 7

• Group 0