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Chemistry · Combined Science

Quantitative Chemistry

Spec 4.3 Paper 1 📙 Higher

Subtopics

Conservation of Mass and Balanced EquationsSpec 5.3.1.1Explain the law of conservation of mass and balance symbol equations. + Relative Formula MassSpec 5.3.1.2Calculate relative formula mass (Mr) from relative atomic masses and use it in calculations. + Mass Changes in ReactionsSpec 5.3.1.3Explain why the measured mass sometimes appears to change in a reaction and predict mass changes. + Chemical MeasurementsSpec 5.3.1.4Describe the importance of precise measurements in chemistry and sources of uncertainty. + Concentration of SolutionsSpec 5.3.2.5Define concentration and calculate it from mass and volume. + MolesSpec 5.3.2.1Define the mole, use the Avogadro constant and calculate moles from mass and Mr. + Amounts of Substances in EquationsSpec 5.3.2.2Use balanced equations and moles to calculate masses of reactants and products. + Using Moles — Calculations and Limiting ReactantsSpec 5.3.2.3–5.3.2.4Use moles to balance equations, calculate concentration in mol/dm³ and identify limiting reactants. +

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Key Equations

mol = mass ÷ Mr

mol = c × V

mol = V ÷ 24

% yield = actual ÷ theoretical × 100

Atom economy = Mr useful ÷ Mr all × 100

⭐ Higher Tier Content

Limiting reactant calculations

Titration calculations — moles from burette readings

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