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.

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.

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i