Chemistry 5070 · O Level · Polymers

Polymers — practice question

The flow chart displays the stages used to manufacture poly(propenenitrile).
(a)[1]

Long-chain alkanes such as $\text{C}_{17}\text{H}_{36}$ may be cracked to produce propene, $\text{C}_3\text{H}_6$. Construct an equation to show the cracking of $\text{C}_{17}\text{H}_{36}$ to make propene.

(b)[2]

The equation shows how propenenitrile is made. $2\text{C}_3\text{H}_6(g) + 2\text{NH}_3(g) + 3\text{O}_2(g) \rightarrow 2\text{C}_3\text{H}_3\text{N}(g) + 6\text{H}_2\text{O}(g)$. Describe and explain what happens to the rate of this reaction when the temperature is increased.

(c(i))[1]

The structure of propenenitrile is shown. Explain why propenenitrile is unsaturated.

(c(ii))[2]

Describe a chemical test that shows propenenitrile is unsaturated.

(d)[2]

Draw a section of poly(propenenitrile).

(e)[2]

A factory uses 1750 tonnes of propenenitrile to make poly(propenenitrile). The percentage yield is 95%. Calculate the mass of poly(propenenitrile) produced.

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: Balanced equation: C₁₇H₃₆ → C₃H₆ + C₁₄H₃₀

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