Difficulty Verdict
The Summer 2022 Foundation Tier papers presented an accessible and balanced assessment. While fundamental recall questions on atomic structure, Group 1 trends, and lab apparatus were straightforward, students were frequently tested on their ability to explain chemical phenomena and perform multi-step calculations. The exam penalized students who overlooked specific mathematical instructions or lacked precise scientific terminology.
Where the Marks Are
A substantial portion of the marks was concentrated in two major areas: Fuels and Earth Science (Paper 2, 40 marks) and Chemical Changes (Paper 1, 36 marks). Key practical skills such as titration steps, filtration/crystallisation procedures, and plotting pH graphs also carried high tariff weightings. Mastery of quantitative chemistry—specifically empirical formulas, percentage yields, and concentration calculations—was essential to securing a top Foundation grade.
Examiner Pitfalls
- Empirical Formula Inversion: Candidates frequently divided the relative atomic mass by the mass of the element rather than dividing the reacting mass by the relative atomic mass \( (\text{mass} / A_r) \).
- Omitting Units and Signs: In calorimetry questions, many students calculated the temperature change magnitude (2.5) but failed to specify the negative sign (\( -2.5 \)) or write the Celsius unit (\( ^\circ\text{C} \)).
- Qualitative vs. Quantitative Indicators: When evaluating litmus paper versus universal indicator, many struggled to articulate that litmus paper is binary/qualitative and cannot display the gradual numerical pH changes required.
Strategy for Success
To maximise marks in future series, students should focus on writing out structured templates for mathematical questions (always checking for requested significant figures). For 6-mark extended writing questions, candidates should use subheadings mirroring the prompt’s requirements to ensure all elements (observations, gas tests, and word equations) are fully addressed.