Introduction to electrolysis

1.

Multiple Choice

30 sec

1 pt

The diagram shows the electrolysis of lead(II) bromide using inert electrodes. Why does the bulb only light up when the lead(II) bromide is melted?

Bromine atoms in lead(II) bromide are converted to ions when it is melted

Electrons flow through the lead(II) bromide when it is melted

The ions in lead(II) bromide are free to move when it is melted

There are no ions in solid lead(II) bromide

2.

Multiple Choice

30 sec

1 pt

The electrode connected to the positive terminal of a battery is __________.

cathode

anode

3.

Multiple Choice

30 sec

1 pt

The negatively charged ions migrate toward the ________.

anode

cathode

4.

Multiple Choice

30 sec

1 pt

What is electrolysis?

breaking down of a compound using a current

making a compound using a current

5.

Multiple Choice

30 sec

1 pt

Which statement correctly describes the 2 electrodes?

The anode is negative and the cathode is positive

The anode and cathode are both positive

The anode is positive and the cathode is negative

The anode and cathode are both negative.

6.

Multiple Choice

30 sec

1 pt

What is the name given to the solution that is being electrolysed?

Salt solution

Electric solution

Mineral solution

Electrolyte

7.

Multiple Choice

30 sec

1 pt

Explain why the electrolyte has to be a liquid.

So the ions can move

So the electrons can move

So that it doesn't get too hot

So the fish are ok

8.

Multiple Choice

30 sec

1 pt

What happens at the positive electrode?

Positive non-metal ions are attracted

Positive metal ions are attracted

Negative non-metal ions are attracted

Negative metal ions are attracted

9.

Multiple Choice

30 sec

1 pt

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

Breaking apart

Losing electrons

Clumping together.

Gaining electrons

10.

Multiple Choice

30 sec

1 pt

What does the Cathode (-) do to ions?

Give electrons to the Positive ions to turn them back into atoms

Take electrons from the positive ions?

Turn ions back into atoms by removing electrons

Turn atoms into ions by adding electrons

11.

Multiple Choice

30 sec

1 pt

What is the equation to show what happens to Cl ions at the anode.

Cl^- --> Cl + e-

2Cl^- --> Cl₂ + 2e-

Cl₂ + 2e-2Cl^-

Cl₂ + 2e-_-->2Cl^-

12.

Multiple Choice

30 sec

1 pt

Anions get discharged by ________ electrons at the ___________

gaining, cathode

losing, anode

gaining, anode

losing, cathode

13.

Multiple Choice

30 sec

1 pt

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

Breaking apart

Losing electrons

Clumping together.

Gaining electrons

14.

Multiple Choice

30 sec

1 pt

What ions are present in molten aluminium oxide?

Al³⁺, O^2-, H⁺, OH^-

Al³⁺, O^2-

Al³⁺, OH^-

15.

Multiple Choice

30 sec

1 pt

Which electrode is inert electrode.

Copper

Iron

Carbon

Zinc

16.

Multiple Choice

30 sec

1 pt

Oxidation is loss of electron. Where does oxidation take place during electrolysis.

At anode

In the solution

At the circuit

At cathode

17.

Multiple Choice

30 sec

1 pt

Which of the following substances conducts electricity in both the solid and liquid states?

Paraffin wax

Potassium

Potassium chloride

Sulfur

Venus

18.

Multiple Choice

30 sec

1 pt

Molten lead(II) bromide is able to conduct electricity due to the presence of

free atoms

molten lead

mobile ions

bromine gas

19.

Multiple Choice

30 sec

1 pt

reduction is ...

loss of electrons

gain of electrons

20.

Multiple Choice

30 sec

1 pt

Electrodes are commonly made of ...

graphite

copper

zinc

sodium

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