Free Printable Periodic Test 3 (Electrolysis)

Worksheets

Periodic Test 3 (Electrolysis)

Total questions: 21

Worksheet time: 5hrs 15mins

Name

Class

Date

Calcium carbonate powder does not conduct electricity because

it does not contain ions

it contains covalent molecules

it contains calcium ions and carbonate ions that are not free to move

all the atoms in calcium carbonate are bonded by strong covalent bonds

Which of the following statements are true about an electrolyte?

it has ions that conduct electricity in the solid state

it can conduct electricity in the molten state or in aqueous solution

it is a compound with ionic bonds only

it can be decomposed by electric current

When molten lead(II) iodide solution is electrolysed using carbon electrodes, which of the following represents the half-equation that occurs at the cathode?

$Pb^{2+}+2e^-\rightarrow Pb$

$Pb\rightarrow Pb^{2+}+2e^-$

$I_2\rightarrow2I^-+2e^-$

$2I^-+2e^-\rightarrow I_{2\ }$

Which of the following substances will produce aluminium metal when electrolysis is carried out using carbon electrodes?

aqueous aluminium sulphate solution

aqueous aluminium chloride solution

solid aluminium oxide

molten aluminium oxide

In an experiment, 0.5 mol dm^-3 copper(II) nitrate solution is electrolysed using carbon electrodes. Which of the following happens if the experiment is carried out for 1 hour?

Bubbles of gas are produced at the cathode.

The anode becomes thicker.

The intensity of the blue colour in the solution decreases.

The concentration of the solution remains unchanged.

Electrolysis is used to extract aluminium metal from molten aluminium oxide. Which chemical is used to lower the melting point of aluminium oxide to 900ºC?

Cryolite

Bauxite

Silicon Dioxide

Calcium carbonate

Which of the following statements is not true about lead-acid accumulator?

The electrolyte used is sulphuric acid.

Lead plate is the negative terminal.

Carbon is the positive terminal.

Lead(II) sulphate is formed when the cell is being used.

If a piece of metal X is immersed in copper(II) sulphate solution, a brown deposit is formed. Metal X may be

copper

platinum

aluminium

silver

A piece of zinc metal is immersed in a beaker containing a mixture of copper(II) sulphate and magnesium nitrate solution. Which of the following does not happen?

Zinc metal dissolves.

Concentration of magnesium ion in the solution decreases.

A brown deposit is formed.

Zinc ions are formed.

10.

Which of the following pairs can undergo a displacement reaction?

Magnesium and potassium chloride solution

Calcium and zinc sulphate solution

Iron and calcium nitrate solution

Copper and magnesium nitrate solution

11.

Excess metal X powder is added to copper(II) sulphate solution and is stirred. After half an hour, the solution becomes colourless and brown deposit is formed. Metal X may be

calcium

aluminium

magnesium

silver

12.

What is electrolysis?

breaking down of a compound using a current

making a compound using a current

13.

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

14.

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

15.

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^-

16.

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 acting as the mobile charge carriers when it is melted

There are no ions in solid lead(II) bromide

17.

What is the half-equation for the discharge of hydroxide ions?

2O^2---> O₂+ 4e^-

OH^- --> OH + e

4OH^- --> 2H₂O + O₂ + 4e^-

2H₂O + O₂ + 4e^- --> 4OH^-

18.

What is the name of a negatively charged ion?

negatron

electron

cation

anion

19.

What particle carries the charge in the wire?

electron

proton

ion

atom

20.

Which factors affect amount of metal formed during electrolysis?

I and II

I and III

II and III

I, II and III

21.

What process occurs at cathode in voltaic cell and at anode in electrolytic cell?

Reset

Periodic Test 3 (Electrolysis)

Total questions: 21

Worksheet time: 5hrs 15mins

Similar Resources on Wayground