5 0 2
This question is about salts and electrolysis.
Do not write
outside the
box
A student wants to make copper chloride crystals.
The student adds excess copper oxide to some hot acid.
The student stirs the mixture.
0 2 . 1
Which acid should the student use?
[1 mark]
Tick (✓) one box
Hydrochloric acid
Nitric acid
Sulfuric acid

Explanation:

In order to produce CuCl2 crystals, there have to be copper and chlorine atoms.

Copper oxide (CuO) has copper atoms. We need the acid to have chlorine atoms.

Out of HCl, HNO3 and H2SO4, only HCl has chlorine atoms.

CuO + 2HCl => CuCl2 + H2O.

Hence the answer is Hydrochloric acid.

i believe it is c.) 1575 j.

to improve her experimental investigation, dalila should add a row in which no fertilizer is used. by a having a contrasting row in which no fertilizer is used, she will have a control group that will her understand the effects of the fertilizer in the plant developments vs the development of the plant when no fertilizer is used.