DP Chemistry (last assessment 2024)
Question 18M.3.sl.TZ1.9b
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.3.sl.TZ1.9b |
| Level | sl | Paper | 3 | Time zone | TZ1 |
| Command term | Formulate | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 1]
18M.3.sl.TZ1.9b
Greenhouse gases absorb infrared radiation.
(b)
Formulate an equation that shows how aqueous carbon dioxide produces hydrogen ions, H+(aq).
[1]
Markscheme
CO2(aq) + H2O(l) H+(aq) + HCO3–(aq)
OR
CO2(aq) + H2O(l) H2CO3(aq) AND H2CO3(aq) H+(aq) + HCO3–(aq)
Accept CO2(aq) + H2O(l) 2H+(aq) + CO32–(aq).
Accept equations with single arrow.
[1 mark]
