Chemistry Paper 2 – Worksheet (Exam mate)
1. Suggest one method, other than measuring pH, which could be
used to distinguish between solutions of a strong acid and a weak
acid of the same molar concentration. State the expected result.
Chem / 2009 /
Measure electrical conductivity;
Strong acids are good conductors/better conductors than weak acids /
weak acids are poor conductors
OR
React with magnesium or a named active metal, metal carbonate,
hydrogen carbonate
Or
Strong acids react faster/more gas bubbles (per unit time)/more heat
produced / weak acids react slower/less gas bubbles (per unit time)
less heat produced.
2. Sodium oxide, Na2O is a white solid with a high meting point.
a) Explain why sodium oxide is a non-conductor of electricity.
In the solid state, ions are in the fixed positions
2O2-  O2 + 4e-
i) Basic
ii) Na2O + H2O  2NaOH
ii)