Alkanes Recap

What elements are in hydrocarbons?

• A. hydrogen and helium

• B. carbon and oyxgen

• C. carbon

• D. carbon and hydrogen

Answer explanation

Hydrocarbon: a compound made of hydrogen and carbon only

what is the name of the technique that separates hydrocarbons in crude oilW

• A. combustion

• B. fractional distillation

• C. chromatography

• D. crystallisation

Answer explanation

Distillation separates mixture based on boiling point

What is the name of the alkane that contains 2 carbons?

• A. ethane

• B. methane

• C. propane

• D. butane

What is the molecular formula of propane?

Which of the following fractions is the most flammable?

• A. refinery gas

• B. petrol

• C. diesel

• D. Fuel oil

Answer explanation

The shorter the hydrocarbon chain the more flammable it is

Which of the following fractions is the most viscous?

• A. refinery gas

• B. petrol

• C. diesel

• D. Fuel oil

Answer explanation

The longer the hydrocarbon chain the more viscous it is.

Which of the following fractions has the lowest boiling point?

• A. refinery gas

• B. petrol

• C. diesel

• D. Fuel oil

Answer explanation

The shorter the hydocarbon chain the lower the boiling point

What is the type of reaction when fuels burn in oxygen?

• A. Neutralisation

• B. Polymerisation

• C. Combustion

• D. Thermal Decomposition

Answer explanation

When fuels are burned it is known as combustion.

What are the products of complete combustion?

• A. Water + oxygen

• B. Water + carbon dioxide

• C. carbon dioxide only

• D. water and carbon monoxide

Which of these is not a product of incomplete combustion?

• A. carbon monoxide

• B. carbon dioxide

• C. soot/carbon particulates

• D. sulfur dioxide

Answer explanation

When there is limited oxygen incomplete combustion occurs