Chemistry · Oct / Nov 2024 · Paper 62 · Question 1
0620
As printed in the paper
The question as text
A teacher uses the apparatus shown in Fig. 1.1 to pass an electric current through molten mercury(II) bromide at a temperature of 300 °C. power supply + – electrodes mercury(II) bromide ice A Fig. 1.1 During the process shown in Fig. 1.1, the molten mercury(II) bromide breaks down and forms bromine and mercury. Table 1.1 shows some information about mercury(II) bromide, bromine and mercury. Table 1.1 substance melting point in °C boiling point in °C density when liquid in g / cm3 mercury(II) bromide 236 322 6 bromine –7 60 3 mercury –39 357
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Show the answer and mark scheme
1(a)[1]
an arrow pointing to the bottom of the left-hand tube
1(b)[1]
test-tube / boiling tube
1(c)[1]
electrolysis
1(d)[2]
any two from:
conducts electricityhigh melting point / melts above 322 °Cdoes not react (with bromine / mercury(II) bromide / mercury / salt / compound) / inert1(e)[1]
X drawn in tube under the electrodes inside the left-hand tube
1(f)[1]
condenses (the bromine / the gas / vapour)
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