超一流化学高手、化学专家请进(Periodicity 0036)

超一流化学高手、化学专家请进(Periodicity 0036)
请用英文解答(该题是要用英文解的答化学题,不是翻译题).谢谢.
Copper is able to form two oxides, copper(I) oxide and copper(II) oxide.
Suggest how copper(I) oxide can be produced from copper(II) oxide.
(b)State the observation when copper sulphate solution is added to glucose in the presence of sodium hydroxide and sodium potassium tartrate.
Thanks.