Year 9

Chemical reactions and conservation

Move from atoms and formulas to word equations, balanced equations and mass calculations.

Subtopics

Reactants, products and particle models

Read formulas and identify atoms rearranging into new substances.

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Worked examples Practice

Balancing simple equations

Choose coefficients that conserve every element without altering formulas.

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Worked examples Practice

Conservation of mass in open and closed systems

Use mass data and system boundaries to account for gases and all reaction products.

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Worked examples Practice