Chlorine, bromine and iodine are elements in group 7 of the periodic table.
Chlorine is toxic.
State one safety precaution that should be taken when using chlorine in the laboratory.
Chlorine reacts with hydrogen to form hydrogen chloride.
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If chlorine solution is added to sodium bromide solution a reaction occurs.
Give a reason why this reaction occurs.
Figure 8 shows apparatus used to find out if a solution conducts electricity.
Glucose solution and sodium chloride solution are tested.
Glucose is a typical simple molecular covalent compound.
Sodium chloride is an ionic compound.
Figure 9 shows how the conductivity of one solution changes as its concentration increases.
Describe how the conductivity of this solution changes as its concentration increases from 0 to 500 gdm-3.
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