(c) Aqueous copper(II) sulphate can be electrolysed using copper electrodes. The reaction at the negative electrode is the same but the positive electrode becomes
smaller and the solution remains blue.
(i) Write a word equation for the reaction at the positive electrode.
[1]
(II) Explain why the colour of the solution does not change.
[2]
(iii) What is the large scale use of this electrolysis?[1]

120,630,890

step-by-step explanation:

110+10=120,620+10=630,880+10=890

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.