Two compounds of barium are barium sulfide and barium chloride.
The hazard symbol shown in Figure 5 is on bottles containing barium metal.
State the meaning of this hazard symbol.
Give the names of the elements combined in barium sulfide.
Barium chloride is toxic.
Explain one safety precaution that should be taken when using barium chloride.
Figure 6
The total mass reading on the balance was 25.7 g.
The dilute sulfuric acid was poured into the barium chloride solution and the beaker replaced on the balance, as shown in Figure 7.
Figure 7
The mixture formed contained a white precipitate.
State the total mass reading on the balance after the reaction.
(1)
Solid sodium chloride is dissolved in water.
The sodium chloride solution is electrolysed in the apparatus shown in Figure 8.
Figure 8
(1)
Circle the ions that would be attracted to the anode.
(1)
(2)
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