DP Chemistry (first assessment 2025)
Question 22M.2.HL.TZ2.2b(ii)
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.HL.TZ2.2b(ii) |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | Draw, Label | Question number | b(ii) | Adapted from | N/A |
b(ii).
[Maximum mark: 1]
22M.2.HL.TZ2.2b(ii)
(b(ii))
Draw an arrow, labelled X, to represent the electron transition for the ionization of a hydrogen atom in the ground state.
[1]
Markscheme
upward arrow X AND starting at n = 1 extending to n = ∞ ✔
Examiners report
Only 30% of the candidates drew the correct arrow on the diagram representing the ionization of hydrogen. A few candidates missed the mark by having the arrow pointing downwards. The most common incorrect answer was a transition between n=1 and n=2.
Syllabus sections
Structure 1. Models of the particulate nature of matter » Structure 1.3—Electron configurations » Structure 1.3.6—In an emission spectrum, the limit of convergence at higher frequency corresponds to ionization. Explain the trends and discontinuities in first ionization energy (IE) across a period and down a group. Calculate the value of the first IE from spectral data that gives the wavelength or frequency of the convergence limit.