Balanced Equations (AQA A-Level Chemistry): Flashcards

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Balanced Equations
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What is conserved in a balanced chemical equation?

Mass and stoichiometric relationships

Definition of spectator ions

Ions that do not change during the reaction

Net ionic equation for acid-base neutralisation

H+(aq)+OH−(aq)→H2O(l)H^+ (aq) + OH^- (aq) \rightarrow H_2O (l)

Formula relating mass, moles and MrM_r

Mass=Moles×Mr\text{Mass} = \text{Moles} \times M_r

Volume occupied by 1 mole of gas at RTP

24 dm324 \, \text{dm}^3

Formula for volume of gas at RTP

Volume=Moles×24 dm3\text{Volume} = \text{Moles} \times 24 \, \text{dm}^3

Formula relating moles, concentration, and volume

Moles=Concentration×Volume\text{Moles} = \text{Concentration} \times \text{Volume}

Formula to calculate molar mass (MrM_r)

Mr=MassMolesM_r = \frac{\text{Mass}}{\text{Moles}}

When balancing atoms, what must be the same on both sides?

Same number of atoms of each element on both sides

Key step in writing net ionic equations

Cancel out spectator ions

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