Addition polymerisation

3 marks · Easy

The monomer propene has the formula .

(a)

Draw the displayed formula of the repeat unit of poly(propene).

[2 marks]

(b)

Write the name of the polymer formed.

[1 mark]

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(a) Displayed formula: —[CH2—CH(CH3)]—n · must show Three carbon atoms, Six hydrogen atoms, Single bonds, CH3 group attached to middle carbon

(b) Poly(propene)

Must show: Correct display of all bonds, Side chain (—CH3) in correct place

Also accept: Repeat unit may have brackets/without n

Common mistakes: Leaving double bond in polymer; Forgetting CH3 group

Show mark scheme and worked solution

Marking points

B1 (a) · 2 marks · Correct displayed repeat unit with all bonds shown, three carbons, six hydrogens, with a CH3 group on the middle carbon; no double bonds.

B2 (b) · 1 mark · Names the polymer as poly(propene).

Worked solution

a) Displayed formula:

Each repeat unit has three carbon atoms with a CH3 group attached to the middle carbon.

b) The polymer formed is called poly(propene).