WJEC A Level Chemistry
WJEC A Level Chemistry 2.8 Instrumental Analysis Exam Questions
Free WJEC A Level Chemistry exam questions on 2.8 Instrumental Analysis, with mark schemes. Covers mass spectrometry, infrared spectroscopy and NMR spectroscopy.
2.8 Instrumental Analysis exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
StemUp mark scheme flashcards
WJEC A Level Chemistry Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
£16.99View flashcards
About WJEC A Level Chemistry 2.8 Instrumental Analysis
This topic covers how compounds are identified. Spectrum interpretation is common.
What you need to know
- Mass spectrometry Molecular ion peak gives Mr; fragmentation patterns help identify structures.
- Infrared Absorption bands identify bonds such as O-H and C=O.
- ¹³C NMR Number of peaks shows number of carbon environments.
- ¹H NMR Chemical shift, integration and splitting (n+1 rule).
Common mistakes in 2.8 Instrumental Analysis
- Using the base peak as the molecular ion.
- Forgetting the broad O-H band in carboxylic acids.
- Misapplying the n+1 rule.
Try three 2.8 Instrumental Analysis exam-style questions
1. State what the molecular ion peak shows. (1 mark)
Show the mark scheme answer
The relative molecular mass of the compound.
2. An IR spectrum shows a strong peak at 1700 cm⁻¹. Which bond is present? (1 mark)
Show the mark scheme answer
C=O.
3. How many peaks are in the ¹³C NMR spectrum of propan-2-ol? (1 mark)
Show the mark scheme answer
Two.
2.8 Instrumental Analysis FAQs
What does Instrumental Analysis cover?
Mass spectrometry, IR and NMR spectroscopy.
Will I be given data tables?
Yes, IR and NMR data are provided.
How do I combine techniques?
Use each spectrum for different evidence and build a structure consistent with all.
Revise this topic with flashcards: WJEC A Level Chemistry Flashcards, with mark scheme answers for Anki and Quizlet.
