Question 1

What is the main purpose of using electrolysis in copper purification?

Accepted Answer

to deposit pure copper at the cathode

Answer

to produce oxygen gas

Answer

to dissolve impurities

Question 2

What happens to the mass of the anode during copper purification by electrolysis?

Accepted Answer

It decreases as copper ions move into the electrolyte.

Answer

It remains the same.

Answer

It increases as copper ions are deposited.

Question 3

What is a common application of electrolysis besides purification?

Accepted Answer

electroplating

Answer

filtration

Answer

crystallisation

Question 4

What happens to impurities in the anode during copper purification?

Accepted Answer

They form a residue in the electrolyte solution.

Answer

They deposit on the cathode.

Answer

They dissolve in the electrolyte.

Question 5

To electroplate a bracelet using silver, the anode is...

Accepted Answer

the silver electrode.

Answer

the bracelet.

Answer

the electrolyte.

Question 6

Which of the following are benefits of electroplating?

Accepted Answer

improved appearance and durability of the surface

Answer

lower production cost of the material

Answer

increased solubility of the material

Answer

decreased electrical conductivity

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