DP Chemistry (last assessment 2024)
Question 17N.3.sl.TZ0.a.i
| Date | November 2017 | Marks available | [Maximum mark: 2] | Reference code | 17N.3.sl.TZ0.a.i |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Compare and contrast | Question number | a.i | Adapted from | N/A |
a.i.
[Maximum mark: 2]
17N.3.sl.TZ0.a.i
In the 20th Century, both fission and fusion were considered as sources of energy but fusion was economically and technically unattainable.
Compare and contrast fission and fusion in terms of binding energy and the types of nuclei involved.
[2]
Markscheme
Fission: heavy nuclei AND Fusion: light nuclei
both increase in binding energy/energy yield «per nucleon»
Accept “large nuclei” OR “greater atomic masses of nuclei” for fission AND “small nuclei” OR “smaller atomic masses of nuclei” for fusion.
Award [1 max] for “Fission: heavy nuclei AND increase in binding energy «per nucleon»” OR “Fusion: light nuclei AND increase in binding energy” «per nucleon»”.
