CSEC Chemistry · January 2009 · Paper 2 · Question 4(a)(iii)

Students are to classify substances as conductors or non-conductors using a bulb, power source, two graphite rods, and connecting wires. Substances provided are zinc metal, aqueous potassium bromide, a solution of bromine in carbon tetrachloride, and solid potassium bromide. Results are to be recorded in Table 5.

By referring to the nature of the substances tested, provide a suitable explanation for EACH observation you recorded in (a) (ii) above. Write your answer in Table 5.

This question uses a figure or table from the paper — you'll see it when you practise.