IGCSE Chemistry (0620) formula sheet
Get the PDFThe mole
| Quantity | Formula |
|---|---|
| Relative formula mass | Mr = sum of all the Ar values in the formula |
| Moles from mass | moles = mass ÷ Mr |
| Mass from moles | mass = moles × Mr |
| Moles of a gas at r.t.p. | moles = volume (dm³) ÷ 24 |
| Volume of a gas at r.t.p. | volume (dm³) = moles × 24 |
| Number of particles | number of particles = moles × 6.02 × 10²³ |
Concentration & titrations
| Quantity | Formula |
|---|---|
| Concentration in mol/dm³ | concentration = moles ÷ volume (dm³) |
| Concentration in g/dm³ | concentration = mass ÷ volume (dm³) |
| Moles from concentration | moles = concentration × volume (dm³) |
Yield, purity & composition
| Quantity | Formula |
|---|---|
| Percentage yield | (actual yield ÷ theoretical yield) × 100 |
| Percentage purity | (mass of pure substance ÷ mass of impure sample) × 100 |
| Percentage composition of an element | (Ar × number of atoms of that element ÷ Mr) × 100 |
Chemical energetics
| Quantity | Formula |
|---|---|
| Energy change (heating/cooling a liquid) | energy = mass × specific heat capacity × temperature change |
| Energy change of a reaction (bond energies) | energy to break bonds in reactants − energy released making bonds in products |
Rate of reaction
| Quantity | Formula |
|---|---|
| Rate of reaction | rate = amount of reactant used (or product formed) ÷ time taken |
Organic chemistry: general formulae
| Homologous series | General formula |
|---|---|
| Alkanes | CnH2n+2 |
| Alkenes | CnH2n |
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