Electrolysis

It is essetial that the electrolyte is a liquid so that...

• Charged ions can migrate towards the electrodes. 

• Charged ions can migrate towards the electrodes.

• The solution can move around.

• The current can flow through it.

What is the name of the process that uses electricity to separate the elements in a compound?

• reduction

• electrolysis

• extraction

• mining

Positive ions (cations) move towards the cathode (-) where they will discharge by....

• Breaking apart

• Losing electrons

• Clumping together.

• Gaining electrons

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

If the fork is to be electroplated with silver metal, what electrolyte should be used?

• Molten silver chloride

• Aqueous silver nitrate

• Sodium chloride solution

• Copper(II) sulphate solution

Tags

NGSS.HS-PS2-5

The picture shows electrolysis of copper(II) sulphate solution using graphite electrodes. Besides formation of brown solid on the cathode, what other observations can be made?

• The mass of graphite anode decreases.

• The blue colour solution becomes paler.

• Bubbles of gas form at the anode.

• The blue colour solution becomes darker.

Which direction do the electrons flow in wire X and which metal is oxidized?

• A

• B

• C

• D

Tags

NGSS.HS-PS2-5

What is the product formed at the anode during the electrolysis of concentrated copper(II) chloride?

• copper

• chlorine

• hydrogen

• oxygen

What is the gas produced at the anode during the electrolysis of very dilute hydrochloric acid?

• water

• oxygen

• hydrogen

• chlorine

What reaction occurs at the anode?

• Ag⁺ + e^- →Ag

• Ag → Ag⁺ + e^-

• Ni²⁺ + 2e^- → Ni

• Ni → Ni²⁺ + 2e^-

Tags

NGSS.HS-PS1-2

In an electrolytic cell, the positive electrode is the

• anode, where oxidation occurs

• anode where reduction occurs

• cathode where reduction occurs