DP Chemistry (last assessment 2024)
Question 19M.3.hl.TZ2.16a(ii)
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.3.hl.TZ2.16a(ii) |
| Level | hl | Paper | 3 | Time zone | TZ2 |
| Command term | Outline | Question number | a(ii) | Adapted from | N/A |
a(ii).
[Maximum mark: 1]
19M.3.hl.TZ2.16a(ii)
This question is about nuclear reactions.
Fission of a nucleus can be initiated by bombarding it with a neutron.
(a(ii))
Outline the concept of critical mass with respect to fission reactions.
[1]
Markscheme
minimum mass to «self-»sustain chain reaction
OR
if mass of fissile material is too small, too many neutrons produced pass out of the nuclear fuel
OR
at least one neutron produced causes further reaction [✔]
Examiners report
This part was also fairly well answered although some candidates missed the concept of minimum mass to sustain a chain reaction.
