Hydrocarbons and Fractional Distillation

What is the runniness of a liquid called?

• Flammability

• Viscosity

• Saturation

• Electricity

Why are fractions with large hydrocarbon molecules more viscous than fractions with small hydrocarbon molecules?

• They contain more molecules

• They have a higher boiling point

• They contain shorter molecules, which are easily tangled

• They contain longer molecules, which are easily tangled

What is the ability for a substance to catch fire called?

• Energy content

• Viscosity

• Flammability

• Volatility

Which of the following statements is true?

• The smaller the hydrocarbons in fuel, the more flammable it is.

• The bigger the hydrocarbons in fuel, the more flammable it is.

• The smaller the hydrocarbons in fuel, the more viscous it is.

• The bigger the hydrocarbons in fuel, the lower the boiling point.

What is a fraction of crude oil?

• A group of molecules with similar sizes

• A group of molecules with very different sizes

• One of the many compounds found in crude oil

• One-eighth

What is the correct order of these fractions in terms of increasing boiling point?

• LPG, petrol, kerosene, diesel, bitumen

• diesel, petrol, LPG, kerosene, bitumen

• LPG, bitumen, diesel, kerosene, petrol

• bitumen, LPG, diesel, petrol, kerosene

Why does bitumen have a higher boiling point than kerosene?

• The hydrocarbon chains are shorter in bitumen

• There are fewer intermolecular forces between bitumen molecules

• Bitumen is found at the bottom of the fractionating column

• The hydrocarbon chains are longer in bitumen and as such there are greater intermolecular forces

Which fraction is found higher up the fractionating column?

• Bitumen

• Naphtha

• Diesel

• Kerosene

Which of the following is used as road surfacing?

• Paraffin wax

• Naphtha

• Bitumen

• Kerosene

What are most fractions of oil used for?

• Making chemicals

• Fuel

• Making plastics

• Lubricating oil