OCR A Level Chemistry Amount of Substance Workbook (AS, Year 12): Mole Calculations + Mark Schemes

Try it free first: 13 pages, including an exam question with a model answer → https://www.tes.com/teaching-resource/resource-13627190

Short summary
A 74-page, step-by-step workbook for OCR A 2.1.3 Amount of Substance: 12 skills, 120 OCR-style questions, a 50-mark exam paper and full mark schemes.

Description

Every mole calculation is a chain of small skills. This workbook teaches them one at a time, then puts them together in OCR-style exam questions.

Written by an experienced A level chemistry teacher for OCR A H432 / H032, section 2.1.3 and PAG 1.
Each skill follows the same four steps:
• Learn it: the rule, with key words highlighted
• See it: a fully worked example as numbered steps, with visual road maps and calculation chains
• Check it: common mistakes and tips taken from OCR examiners’ reports
• Try it: questions that get harder, ending with “OCR twist” questions modelled on the extra bits OCR adds in real papers

The 12 skills

1. Mr and percentage composition by mass
2. n = m ÷ M
3. The mole and the Avogadro constant (atoms, molecules and ions)
4. Empirical and molecular formulae
5. Practical: water of crystallisation in copper(II) sulfate (heat to constant mass, PAG 1)
6. Finding x, the water of crystallisation
7. Gas volumes at RTP
8. The ideal gas equation, pV = nRT
9. Reacting quantities and limiting reagents
10. Percentage yield and atom economy
11. Practical: gas volumes, masses and errors (PAG 1)
12. Solutions: n = c × V (leads straight into Titrations 1)
    Also included
    • A Maths toolkit: significant figures, standard form, calculator use and unit conversions
    • A 50-mark exam paper (10 multiple choice + 40 marks structured, including a 6-mark extended response)
    • Full OCR-style mark schemes with marking points, ALLOW / DO NOT ALLOW and common errors
    • A “Where to go next” table that sends students back to the right skill
    • A skills tracker (Red / Orange / Green)
    Who it is for: Year 12 students learning or revising amount of substance; teachers who want ready-made practice, homework or intervention material; Year 13 students revisiting AS calculations.

Want to look inside first? Download the free 13-page sample, with an OCR-style exam question and a model answer: https://www.tes.com/teaching-resource/resource-13627190

Licence: one teacher may copy for their own students; please do not share or upload. Not endorsed by OCR.

Keywords / tags
amount of substance, moles, mole calculations, OCR A chemistry, A level chemistry, AS chemistry, Year 12 chemistry, empirical formula, water of crystallisation, ideal gas equation, pV = nRT, limiting reagent, atom economy, percentage yield, Avogadro constant, PAG 1, workbook, revision