DP Chemistry (last assessment 2024)
Question 18N.3.sl.TZ0.a
| Date | November 2018 | Marks available | [Maximum mark: 1] | Reference code | 18N.3.sl.TZ0.a |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Formulate | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
18N.3.sl.TZ0.a
Coal can be converted to clean-burning synthetic natural gas.
Formulate equation(s) for the conversion of coal and steam to methane.
[1]
Markscheme
ALTERNATIVE 1:
2C (s) + 2H2O (g) → CH4 (g) + CO2 (g) ✔
ALTERNATIVE 2:
C (s) + 2H2O (g) → CO (g) + H2 (g) AND 3H2 (g) + CO (g) → CH4 (g) + H2O (g) ✔
Accept “3C (s) + 2H2O (g) → CH4 (g) + 2CO (g)”.
