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Relative Formula Mass | GCSE Chemistry

Relative Formula Mass | GCSE Chemistry

Subject: Chemistry

Age range: 14-16

Resource type: Lesson (complete)

Last updated

8 November 2026

pptx, 586.27 KB
pptx, 586.27 KB
pdf, 159.14 KB
pdf, 159.14 KB
docx, 19.09 KB
docx, 19.09 KB

Complete GCSE Chemistry lesson on Relative Formula Mass for AQA, Edexcel & OCR – 51 editable slides + differentiated worksheets with full answers. If we can’t weigh a single molecule, how do chemists know that carbon dioxide is 2½ times heavier than water – and what is ‘relative’ about it?

Lesson 2 of the C3 Quantitative Chemistry unit. Suitable for Combined Science (Trilogy) and Triple Chemistry, Foundation and Higher tiers. Just open and teach – every slide, worksheet and answer is done for you.

What’s included

  • 51-slide editable PowerPoint – every word at least 28 pt, so it reads clearly from the back of the room (great for SEN, dyslexia and visual impairment)
  • Do Now retrieval starter with answers, a hook, I do / we do / you do modelling and clear diagrams
  • Mini-whiteboard quiz, a hinge question with explained answers, and click-by-click answer reveals
  • Exam-style question with mark scheme and sentence starters, 3-2-1 exit ticket, homework and glossary
  • Clickable countdown timers and full teacher notes (spec match, 60-minute lesson plan, common misconceptions)
  • 6-page differentiated worksheet pack (Word + PDF) – Bronze, Silver and Gold tasks, a stretch challenge, exam question, exit ticket and full answers and mark schemes

Learning objectives

  • Bronze: Find Ar values on the periodic table. Calculate Mr for simple formulae by adding up Ar values.
  • Silver: Calculate Mr for formulae with subscripts and brackets. Calculate the percentage by mass of an element in a compound.
  • Gold: Show that Mr is conserved across a balanced equation and handle hydrated salts. Edexcel/OCR: work out empirical and molecular formulae from masses or percentages.

Specification

  • AQA GCSE Chemistry 8462 / Combined Science Trilogy 8464 – 4.3.1.2
  • Edexcel GCSE Chemistry 1CH0 / Combined Science 1SC0 – matching topic content
  • OCR Gateway Chemistry A J248 / Combined Science A J250 – matching topic content

Key words: relative atomic mass (Ar), relative formula mass (Mr), mass number, subscript, bracket, percentage by mass, empirical formula, molecular formula, ratio

Save money: this lesson is also in the discounted C3 Quantitative Chemistry complete unit bundle and the full GCSE Chemistry course bundle (C1–C10).

Ideal for KS4 / Year 10 and Year 11 GCSE Chemistry teaching, cover lessons, intervention and revision of relative formula mass.

Get this resource as part of a bundle and save up to 40%

A bundle is a package of resources grouped together to teach a particular topic, or a series of lessons, in one place.

Bundle

C3 Quantitative Chemistry | GCSE Chemistry Bundle

**The complete C3 Quantitative Chemistry unit for GCSE Chemistry (AQA, Edexcel & OCR) – 8 ready-to-teach lessons, 411 editable slides and differentiated worksheets with full answers. Save 30% on buying the lessons separately.** Everything you need to teach the whole Quantitative Chemistry topic: every lesson is fully resourced, so you can just open and teach. Suitable for Combined Science (Trilogy) and Triple Chemistry, Foundation and Higher tiers – Triple-only and Higher-tier content is clearly labelled. **Lessons in this bundle** 1. Conservation of Mass & Balancing 2. Relative Formula Mass 3. Moles 4. Reacting Masses & Limiting Reactants 5. Concentration of Solutions 6. Percentage Yield & Atom Economy (Triple) 7. Titration Calculations (Triple) 8. Volumes of Gases (Triple) **Every lesson includes** - **Editable PowerPoint** – every word at least 28 pt, so it reads clearly from the back of the room (great for SEN, dyslexia and visual impairment) - Do Now retrieval starter, hook, I do / we do / you do modelling with clear diagrams - Mini-whiteboard quiz, hinge question with explained answers and click-by-click answer reveals - Exam-style question with mark scheme, 3-2-1 exit ticket, homework and glossary - Countdown timers and full teacher notes (spec match, 60-minute lesson plan, misconceptions) - **Differentiated worksheet pack (Word + PDF)** – Bronze, Silver and Gold tasks, stretch challenge, exam question and **full answers and mark schemes** **Why teachers buy this bundle** - Saves hours of planning for the whole unit - Consistent lesson structure students quickly get used to - Mapped to the AQA specification with Edexcel and OCR Gateway equivalents Save even more: the **C3–C4 Quantitative Chemistry & Chemical Changes** mega bundle includes this unit plus C4 at 40% off. Five mega bundles (C1–C2, C3–C4, C5–C6, C7–C8, C9–C10) together cover the complete GCSE Chemistry course. Keywords: GCSE chemistry quantitative chemistry, AQA chemistry C3, combined science trilogy, triple chemistry, KS4 chemistry lessons, chemistry worksheets with answers

£19.50
Bundle

C3–C4 Quantitative Chemistry & Chemical Changes | GCSE Chemistry Bundle

**C3–C4 Quantitative Chemistry & Chemical Changes for GCSE Chemistry (AQA, Edexcel & OCR) – 16 ready-to-teach lessons covering two full units, 816 editable slides and differentiated worksheets with full answers. Save 40% on buying the lessons separately.** This mega bundle combines **C3 Quantitative Chemistry** and **C4 Chemical Changes** – every lesson fully resourced, so you can just open and teach. Suitable for Combined Science (Trilogy) and Triple Chemistry, Foundation and Higher tiers – Triple-only and Higher-tier content is clearly labelled. **Lessons in this bundle** 1. Conservation of Mass & Balancing 2. Relative Formula Mass 3. Moles 4. Reacting Masses & Limiting Reactants 5. Concentration of Solutions 6. Percentage Yield & Atom Economy (Triple) 7. Titration Calculations (Triple) 8. Volumes of Gases (Triple) 9. The Reactivity Series 10. Extracting Metals 11. Acids & Making Salts 12. pH & Neutralisation 13. Titration Practical (Triple) 14. Electrolysis 15. Extracting Aluminium 16. Electrolysis of Solutions **Every lesson includes** - **Editable PowerPoint** – every word at least 28 pt, so it reads clearly from the back of the room (great for SEN, dyslexia and visual impairment) - Do Now retrieval starter, hook, I do / we do / you do modelling with clear diagrams - Mini-whiteboard quiz, hinge question with explained answers and click-by-click answer reveals - Exam-style question with mark scheme, 3-2-1 exit ticket, homework and glossary - Countdown timers and full teacher notes (spec match, 60-minute lesson plan, misconceptions) - **Differentiated worksheet pack (Word + PDF)** – Bronze, Silver and Gold tasks, stretch challenge, exam question and **full answers and mark schemes** **Best value:** this mega bundle saves 40% – more than buying the two unit bundles separately. All five mega bundles (C1–C2, C3–C4, C5–C6, C7–C8, C9–C10) together cover the complete GCSE Chemistry course. Keywords: GCSE chemistry quantitative chemistry & chemical changes, AQA chemistry C3 C4, combined science trilogy, triple chemistry, KS4 chemistry scheme of work, chemistry worksheets with answers

£33.50

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