A concentrated aqueous solution of calcium bromide is electrolysed with graphite electrodes. Predict the substance formed at each electrode.
Graphite electrodes are used to electrolyse molten calcium bromide. Construct the ionic half-equation for the change at each electrode when molten calcium bromide is electrolysed.
Describe a test for aqueous bromide ions. Include what is seen if the result is positive.
Explain, in terms of electron transfer, how calcium acts as a reducing agent in the equation $\text{Ca} + \text{Zn}^{2+} \rightarrow \text{Zn} + \text{Ca}^{2+}$.
State the oxidation number for the $\text{Zn}^{2+}$ ion.
Sulfur dibromide is formed when sulfur reacts with bromine. Complete Fig. 4.1 to show the dot-and-cross diagram for a molecule of sulfur dibromide. Show only the outer shell electrons.