Alkenes | Starter Quiz | Oak National Academy

How many covalent bonds can a carbon atom form?

• one

• two

• three

• four

• five

Answer explanation

A carbon atom can form four covalent bonds.

What are compounds that contain hydrogen and carbon atoms only called?

Answer explanation

Hydrocarbons are compounds that contain hydrogen and carbon atoms only.

Which of the following equations for the complete combustion of alkanes is correct?

• alkane + oxygen → carbon monoxide + water

• alkane + oxygen → carbon dioxide + water

• alkane + water → carbon + oxygen

• alkane + oxygen → carbon dioxide + hydrogen

• alkane + oxygen → carbon monoxide + hydrogen

Answer explanation

The correct equation for the complete combustion of alkanes is: alkane + oxygen → carbon dioxide + water

Which of the following are possible products from the incomplete combustion of propene?

• carbon (soot)

• carbon monoxide

• oxygen

• ethene

• water

Answer explanation

Propene undergoes incomplete combustion when it reacts with a limited supply of oxygen to form carbon (soot), carbon monoxide and water.

Which of the following is the general formula for alkanes? Use the image shown of an ethane molecule to help you work it out.

• CₙH₂ₙ

• CₙH₂ₙ₊₁

• CₙH₂ₙ₊₂

• CₙH₂ₙ₊₃

Answer explanation

The general formula of alkanes is CₙH₂ₙ₊₂.

Sort the following alkenes into order of increasing chain length, starting with the molecule that has the shortest chain.

• ethene

• propene

• hexene

• butene

• pentene

Answer explanation

The correct order, when sorted by increasing chain length, is: ethene, propene, butene, pentene and hexene.