DP Chemistry (last assessment 2024)
Question 18M.3.sl.TZ2.18c
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.sl.TZ2.18c |
| Level | sl | Paper | 3 | Time zone | TZ2 |
| Command term | Explain | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 2]
18M.3.sl.TZ2.18c
Excess acid in the stomach is often treated with calcium carbonate.
(c)
Explain how omeprazole (Prilosec) regulates pH in the stomach.
[2]
Markscheme
inhibits the secretion of stomach acid/H+
«active metabolites» bind «irreversibly» to «receptors of the» proton pump
Do not accept “hydrogen/H/H2” for “H+”.
Accept “PPI/proton pump inhibitor” for M2.
Accept “H+/K+ ATPase” for “proton pump”.
[2 marks]
