*(d) Impure copper can be purified using electrolysis. In this electrolysis
• the anode is made of impure copper
• the cathode is made from pure copper
• the electrolyte is copper sulfate solution.
The apparatus at the start of the experiment is shown in Figure 7.

During the electrolysis three observations are made

• the sizes of both the anode and the cathode change

• a solid appears directly beneath the anode

• the colour of the copper sulfate solution does not change.
Explain all three observations.

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Easy definition for atom and atomic mass

Explain that newton first law,second law and third law of motion?

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.