DP Chemistry (last assessment 2024)
Question 19M.3.hl.TZ2.4b
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.hl.TZ2.4b |
| Level | hl | Paper | 3 | Time zone | TZ2 |
| Command term | Suggest | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
19M.3.hl.TZ2.4b
Metals are extracted from their ores by several methods, including electrolysis and reduction with carbon.
(b)
Once extracted, the purity of the metal can be assessed using ICP-MS. Suggest two advantages of using plasma technology rather than regular mass spectrometry.
[2]
Markscheme
Any two of:
larger linear calibration [✔]
«accurate» detection of multiple elements/metals [✔]
«accurate» detection of elements in low concentration [✔]
temperature around 10 000 K atomises/ionises every material [✔]
Examiners report
Most candidates did not seem to understand any advantages of using plasma technology rather than regular mass spectrometry.
