Calculations involving masses
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Why this why now
This unit builds on pupils’ prior learning from Understanding chemical reactions, where they explored how substances interact and rearrange during reactions. It deepens their understanding by focusing on calculations involving masses, such as relative formula mass, moles, and stoichiometry. This prepares pupils for the next unit, Making salts, where they will apply these calculation skills to chemical reactions involving acids and bases, reinforcing their understanding of quantitative chemistry and the practical applications of reaction yields.
Prior knowledge requirements
- Chemical reactions are represented using chemical equations.
- The arrow in a chemical equation represents the words ‘changes into’.
- Chemical equations represent how the atoms in the reactants rearrange to form the products.
- Evidence for a chemical reaction can include: bubbles, smell, colour or temperature change.
Threads
Why this why now
This unit builds on pupils’ prior learning from Understanding chemical reactions, where they explored how substances interact and rearrange during reactions. It deepens their understanding by focusing on calculations involving masses, such as relative formula mass, moles, and stoichiometry. This prepares pupils for the next unit, Making salts, where they will apply these calculation skills to chemical reactions involving acids and bases, reinforcing their understanding of quantitative chemistry and the practical applications of reaction yields.
Prior knowledge requirements
- Chemical reactions are represented using chemical equations.
- The arrow in a chemical equation represents the words ‘changes into’.
- Chemical equations represent how the atoms in the reactants rearrange to form the products.
- Evidence for a chemical reaction can include: bubbles, smell, colour or temperature change.
Chemistry
Calculations involving masses
This unit covers writing chemical formulae, balancing equations, and using the conservation of mass. It includes calculating moles, empirical formulae, relative formula masses, and theoretical yields. Emphasis is on stoichiometry, concentration, gas volumes, and using standard form.
13 lessons in unit
slide decks, worksheet PDFs, quizzes and lesson overviews. You can select individual lessons from the Calculations involving masses unit and download the resources you need, or download the entire unit now. See every unit listed in our Edexcel secondary combined science curriculum and discover more of our teaching resources for Edexcel secondary combined science programmes.