Question 1

How do I get full marks on a 6-mark question in Pearson Edexcel A-Level Chemistry?

Accepted Answer

Extended-answer questions worth 6 marks in Pearson Edexcel A-Level Chemistry are marked using levels-of-response criteria, which means you're assessed on the quality and completeness of your scientific explanation, not just isolated facts. To pick up full marks, you need to construct a logically structured argument that addresses every part of the question.

**Build a coherent scientific narrative.** Start by identifying all the distinct points the question is asking for, if it's asking you to explain a trend, compare two processes, or evaluate a conclusion, make sure your answer explicitly does all of that. Link your ideas together so the examiner can follow your reasoning from start to finish, rather than reading a list of disconnected statements. Use scientific terminology accurately throughout (the specification expects precise language for concepts like bond enthalpy, oxidation number, and nucleophile, for example).

**Show depth, not just breadth.** A top-level answer demonstrates detailed understanding, for instance, if you're explaining why ionisation energy increases across a period, don't just state "more protons"; explain how the increased nuclear charge pulls electrons more strongly while shielding remains similar because electrons are added to the same shell. Where relevant, include equations, mechanisms (with curly arrows where appropriate), or structural formulae to support your explanation.

Question 2

What do the levels in the Pearson Edexcel A-Level Chemistry mark scheme mean?

Accepted Answer

Pearson Edexcel A-Level Chemistry mark schemes use **levels of response** marking for some questions, where your answer is assessed against descriptors for different levels (typically Level 1, Level 2, and Level 3). Each level describes the quality of your response in terms of how well you've understood the chemistry, how clearly you've explained it, and how thoroughly you've linked your answer to the question. To reach Level 3 (the highest), you need to provide a detailed, coherent explanation with correct chemistry and terminology, directly addressing what the question asks.

Lower levels reflect partial understanding or less complete answers. Our exam practice questions show you how to structure responses to meet the highest-level criteria, so you can see what examiners are looking for at each stage.

Question 3

What's the difference between Cognito's exam practice and past papers?

Accepted Answer

Our exam practice is made by expert teachers and follows the same structure, style and difficulty level as the real Edexcel A-Level Chemistry papers. The main difference is that you can filter by topic, so you can target specific areas where you need more practice, something past papers don't let you do.

Real past papers are great for full mocks under timed conditions, but our questions give you the flexibility to drill weaker topics first. Use our exam practice while you're building knowledge and confidence, then move to full past papers when you're ready to test yourself on everything together.

Question 4

How long should I spend on each question in the exam?

Accepted Answer

The simple guideline is to aim for **roughly 1 minute per mark**, so a 5-mark question should take around 5 minutes, while a 10-mark question gives you about 10 minutes.

That said, some questions need more thinking time than others. Short calculations or definitions might take less than a minute per mark, whereas extended response questions or multi-step problems might need a bit longer. We'd suggest using the mark allocation as your starting point, but staying flexible, if you finish a question early, move on and use any spare time to check your work at the end.

Our exam practice on this page gives you plenty of timed questions to help you get a feel for pacing across all three papers.