DP Chemistry (first assessment 2025)
Question 20N.1A.SL.TZ0.30
| Date | November 2020 | Marks available | [Maximum mark: 1] | Reference code | 20N.1A.SL.TZ0.30 |
| Level | SL | Paper | 1A | Time zone | TZ0 |
| Command term | State | Question number | 30 | Adapted from | N/A |
30.
[Maximum mark: 1]
20N.1A.SL.TZ0.30
Which region of the electromagnetic spectrum is used to identify hydrogen environments in a molecule?
A. X-ray
B. UV
C. IR
D. radio waves
[1]
Markscheme
D
Examiners report
Not even a quarter of candidates knew the region of the electromagnetic spectrum associated with identifying hydrogen environments. This was the lowest scoring question on the exam with the most popular answer
being IR region.
Syllabus sections
Structure 1. Models of the particulate nature of matter » Structure 1.3—Electron configurations » Structure 1.3.1—Emission spectra. Emission spectra are produced by atoms emitting photons when electrons in excited states return to lower energy levels. Qualitatively describe the relationship between colour, wavelength, frequency and energy across the electromagnetic spectrum. Distinguish between a continuous and a line spectrum.