An oil refinery cracks large alkane molecules into smaller, more useful molecules. The formulae of four products of cracking are:

$C2H4\mathrm{C_{2}H_{4}}$ $\qquad$ $C3H8\mathrm{C_{3}H_{8}}$ $\qquad$ $C5H10\mathrm{C_{5}H_{10}}$ $\qquad$ $C6H14\mathrm{C_{6}H_{14}}$

Give the formulae of the two products that are alkenes. Give a reason for your answer.

Balance the equation for the cracking of dodecane, $C12H26\mathrm{C_{12}H_{26}}$ .

$C2H4\mathrm{C_{12}H_{26}} \rightarrow \mathrm{C_{8}H_{18}} + \ldots\,\mathrm{C_{2}H_{4}}$

Give one use of alkenes such as ethene.

Ethene and propene react in the same way with bromine. Explain why.

The refinery tests a sample of the cracking products with bromine water. Predict what the chemist will see. Give a reason for your answer.

An oil refinery cracks large alkane molecules into smaller, more useful molecules. The formulae of four products of cracking are:

$C2H4\mathrm{C_{2}H_{4}}$ $\qquad$ $C3H8\mathrm{C_{3}H_{8}}$ $\qquad$ $C5H10\mathrm{C_{5}H_{10}}$ $\qquad$ $C6H14\mathrm{C_{6}H_{14}}$

Give the formulae of the two products that are alkenes. Give a reason for your answer.

Balance the equation for the cracking of dodecane, $C12H26\mathrm{C_{12}H_{26}}$ .

$C2H4\mathrm{C_{12}H_{26}} \rightarrow \mathrm{C_{8}H_{18}} + \ldots\,\mathrm{C_{2}H_{4}}$

Give one use of alkenes such as ethene.

Ethene and propene react in the same way with bromine. Explain why.

The refinery tests a sample of the cracking products with bromine water. Predict what the chemist will see. Give a reason for your answer.

10.2 Hydrocarbons

10.2 Hydrocarbons Questions