Chemistry 5070 · O Level · Alkenes

Alkenes — practice question

A learner sets up apparatus to make ethene, $\text{C}_2\text{H}_4$, as shown below.
(a(i))[1]

What is this reaction known as?

(a(ii))[1]

Suggest why aluminium oxide is used in this reaction.

(a(iii))[1]

The liquid alkane contains eight carbon atoms in each molecule. Give the molecular formula of the alkane.

(a(iv))[1]

Ethene is formed together with one further product. Construct a possible equation for the reaction.

(b(i))[1]

A few drops of aqueous bromine are added to ethene. What is observed?

(b(ii))[1]

Which type of reaction takes place?

(b(iii))[1]

Construct an equation for the reaction of bromine with ethene.

(c)[2]

If ethene burns completely in air, water and a colourless gas are produced. Name the colourless gas. Give a test and the observation used to identify this gas.

Worked solution & mark scheme

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