Question 22M.2.hl.TZ1.1f
| Date | May 2022 | Marks available | [Maximum mark: 2] | Reference code | 22M.2.hl.TZ1.1f |
| Level | hl | Paper | 2 | Time zone | TZ1 |
| Command term | Suggest | Question number | f | Adapted from | N/A |
When heated in air, magnesium ribbon reacts with oxygen to form magnesium oxide.
Suggest two reasons why atoms are no longer regarded as the indivisible units of matter.
[2]
Any two of:
subatomic particles «discovered»
OR
particles smaller/with masses less than atoms «discovered»
OR
«existence of» isotopes «same number of protons, different number of neutrons» ✔
charged particles obtained from «neutral» atoms
OR
atoms can gain or lose electrons «and become charged» ✔
atom «discovered» to have structure ✔
fission
OR
atoms can be split ✔
Accept atoms can undergo fusion «to produce heavier atoms»
Accept specific examples of particles.
Award [2] for “atom shown to have a nucleus with electrons around it” as both M1 and M3.
Good performance; some teachers were concerned about the expected answers. However, generally, students were able to suggest two reasons why matter is divisible.
