(a)[2]
Which substance is reduced in this reaction? Give a reason for your answer.
(b(i))[1]
As the experiment continues, what would you expect to happen to the mass of the copper(II) oxide?
(b(ii))[1]
Suggest why electrical heating is used in this experiment instead of a Bunsen burner.
(b(iii))[2]
Describe the chemical test used to show that water is present. test [BLANK] result [BLANK]