Chemical calculations

Build G2 Science Chemistry formulae and balanced equations, find relative masses and practise converting between mass and moles.

Before you begin

Build G2 Science Chemistry formulae and balanced equations, find relative masses and practise converting between mass and moles.

Learning goals

State the symbols of the elements and the formulae of the compounds in the syllabus
Deduce a compound's formula from the relative numbers of its atoms, and the reverse
Deduce the formula of an ionic compound from the charges on its ions, and the reverse
Interpret chemical equations that include state symbols
Construct chemical and ionic equations with state symbols
Define relative atomic mass, Aᵣ
Define relative molecular mass, Mᵣ, and calculate Mᵣ and relative formula mass by adding relative atomic masses
Use the relationship between amount in moles, mass and molar mass in calculations

Syllabus statements covered

state the symbols of the elements and formulae of the compounds mentioned in the syllabus
deduce the formulae of simple compounds from the relative numbers of atoms present and vice versa
deduce the formulae of ionic compounds from the charges on the ions present and vice versa
interpret chemical equations with state symbols
construct chemical equations, with state symbols, including ionic equations.
define relative atomic mass, Ar
define relative molecular mass, Mr, and calculate relative molecular mass (and relative formula mass) as the sum of relative atomic masses
perform calculations involving the relationship between the amount of substances in moles, mass and molar mass (calculations of stoichiometric reacting masses and volumes of gases are not required).

Work through them in order.

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