DP Chemistry (last assessment 2024)
Question 19M.3.hl.TZ2.a(i)
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.3.hl.TZ2.a(i) |
| Level | hl | Paper | 3 | Time zone | TZ2 |
| Command term | Outline | Question number | a(i) | Adapted from | N/A |
a(i).
[Maximum mark: 1]
19M.3.hl.TZ2.a(i)
Excess acid in the stomach can cause breakdown of the stomach lining.
Outline how ranitidine (Zantac) inhibits stomach acid production.
[1]
Markscheme
blocks/binds H2/histamine receptors «in cells of stomach lining»
OR
prevents histamine molecules binding to H2/histamine receptors «and triggering acid secretion» [✔]
Examiners report
Some candidates were not confident enough in their answers to receive a mark while others confused the action of ranitidine which blocks H2 receptors with omeprazole which is a proton pump inhibitor.
