Define what isotopes are.
Deduce how many protons, neutrons and electrons are present in the sulfide ion shown, $^{36}_{16}\text{S}^{2-}$.
Complete Fig. 4.1 by adding these formulae to the diagram: $\text{S} + \text{O}_2$ and $\text{SO}_2$.
Explain how Fig. 4.1 shows that the reaction is exothermic.
Complete this sentence: An exothermic reaction transfers thermal energy to the ..............
Label Fig. 4.2 so that the cathode and the electrolyte are shown.
State the products formed and the observations seen at the positive and negative electrodes.
Complete the word equation for the reaction of dilute sulfuric acid with sodium carbonate: sulfuric acid + sodium carbonate → [BLANK] + [BLANK] + [BLANK].
A few drops of thymolphthalein indicator are added to dilute sulfuric acid. State the colour of the solution.