MYP Chemistry Criterion A: Knowing & Understanding — Explained

Score well by doing three things every task: state scientific facts and concepts precisely, explain them using correct terminology and reasoning (not just describe), and apply them to unfamiliar situations or data. According to the MYP Sciences guide, Criterion A is marked out of 8 across four strands — knowledge, understanding, application, and analysis of scientific information.

The four strands are: (i) recall scientific knowledge, (ii) apply scientific knowledge to solve problems in familiar and unfamiliar situations, (iii) analyse and evaluate information to make judgements, and (iv) apply scientific understanding to construct scientific explanations. Each is assessed together, not as separate marks — the highest band you hit needs all strands present.

Criterion A is a task-based, criterion-referenced mark out of 8 assessed by your teacher against MYP rubric strands, usually 2-4 times a year. DP internal assessment is a single formal piece marked against IB assessment criteria (like the Chemistry IA's five criteria) with external moderation. MYP is formative practice; DP IA is summative and university-facing.

Criterion A is marked 0-8, and this combines with Criteria B, C and D (each also out of 8) into a total out of 32, which then maps to the final MYP 1-7 grade using the school's grade boundary conversion. A 7-8 on Criterion A alone typically requires precise recall, correct application to unfamiliar contexts, and reasoned analysis — but your final subject grade depends on all four criteria together.

A factually correct answer only satisfies the lowest strand. If the task asks you to explain or apply, a bald correct statement without reasoning or context usually gets capped in the 3-4 band. Examiners are marking the depth and precision of your scientific reasoning, not just whether the final answer matches an answer key.

Criterion A judges what you know and whether your scientific reasoning is correct. Criterion C judges how clearly you communicate it — structure, scientific conventions, referencing, and appropriate use of units and terminology. You can have strong chemistry (high A) let down by disorganised presentation (low C), or vice versa.

Revise by practising past task-style questions that use command terms like explain, justify and predict, not just flashcards of definitions. Build short model answers for core topics — particle theory, bonding, chemical reactions, acids and bases — that show reasoning, not just conclusions, since that's what separates a 5-6 from a 7-8.

The most common are state, describe, explain, apply, predict and analyse — each demanding a different depth of answer. State wants a fact; explain wants reasoning with cause and effect; analyse wants you to break down information and draw a conclusion supported by evidence.

Yes. For a task on why metals conduct electricity, a strong answer states the fact (metals have delocalised electrons), explains the mechanism (these electrons move freely through the metallic lattice, carrying charge), and applies it to a new context (predicting that alloys with fewer free electrons conduct less well).

A 5-6 usually means your child explains concepts correctly in familiar situations but struggles to apply that knowledge to new or unfamiliar contexts — the jump the 7-8 band specifically requires. This is a skill, not a knowledge gap, and it's fixable with targeted practice on unfamiliar-context questions rather than more content revision.

It's a reasonable early indicator, not a guarantee. Strong Criterion A performance shows your child can apply chemistry knowledge to unfamiliar situations — exactly what DP Chemistry Paper 2 and Paper 3 demand — but DP also adds mathematical rigour and a formal internal assessment that MYP doesn't require.

Look for resources that practise applying knowledge to unfamiliar scenarios, not just recall drills — since that's where marks are actually lost. On revisionprep.com, the MYP Chemistry Revision Notes and Topical Worksheets are built around exactly this command-term and application-based approach, letting your child self-mark against real rubric language.