DP Chemistry (last assessment 2024)
Question 18M.2.sl.TZ1.f
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.2.sl.TZ1.f |
| Level | sl | Paper | 2 | Time zone | TZ1 |
| Command term | Formulate | Question number | f | Adapted from | N/A |
f.
[Maximum mark: 2]
18M.2.sl.TZ1.f
Urea, (H2N)2CO, is excreted by mammals and can be used as a fertilizer.
The combustion of urea produces water, carbon dioxide and nitrogen.
Formulate a balanced equation for the reaction.
[2]
Markscheme
2(H2N)2CO(s) + 3O2(g) → 4H2O(l) + 2CO2(g) + 2N2(g)
correct coefficients on LHS
correct coefficients on RHS
Accept (H2N)2CO(s) + O2(g) → 2H2O(l) + CO2(g) + N2(g).
Accept any correct ratio.
[2 marks]
