DP Chemistry (first assessment 2025)
Question 21N.2.HL.TZ0.a
| Date | November 2021 | Marks available | [Maximum mark: 2] | Reference code | 21N.2.HL.TZ0.a |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | Explain | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
21N.2.HL.TZ0.a
Explain the general increase in trend in the first ionization energies of the period 3 elements, Na to Ar.
[2]
Markscheme
increasing number of protons
OR
increasing nuclear charge ✔
«atomic» radius/size decreases
OR
same number of shells/electrons occupy same shell
OR
similar shielding «by inner electrons» ✔
Syllabus sections
Structure 3. Classification of matter » Structure 3.2—Functional groups: Classification of organic compounds » Structure 3.2.8—Mass spectrometry (MS) of organic compounds can cause fragmentation of molecules. Deduce information about the structural features of a compound from specific MS fragmentation patterns.