DP Chemistry (last assessment 2024)
Question 17N.3.sl.TZ0.7c
| Date | November 2017 | Marks available | [Maximum mark: 2] | Reference code | 17N.3.sl.TZ0.7c |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Deduce | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 2]
17N.3.sl.TZ0.7c
The development of materials with unique properties is critical to advances in industry.
(c)
Many plastics used to be incinerated. Deduce an equation for the complete combustion of two repeating units of PVC, (–C2H3Cl–)2.
[2]
Markscheme
(–C2H3Cl–)2 (s) + 5O2 (g) → 4CO2 (g) + 2H2O (l) + 2HCl (g)
correct species in reactants and products
balanced
Accept “(–C2H3Cl–)2 (s) + 5.5O2 (g) → 4CO2 (g) + 3H2O (l) + Cl2 (g)”.
Award M2 only if M1 correct.
