Electrochemistry revision

1

3

4

5

6

1

An electrochemical cell is used to electroplate an iron spoon with nickel. Which ONE of the following half reactions takes place at the positive electrode of this cell?

Fe²⁺ (aq) + 2e^- --> Fe(s)

Fe(s) --> Fe²⁺ (aq) + 2e^-

Ni²⁺(aq) + 2e^- ---> Ni(s)

Ni(s) ---> Ni²⁺(aq) + 2e^-

1

Which of the following reactions is non-spontaneous?

A

B

C

D

5

Cr₂O₇^2- + SO₃^2- → Cr³⁺ + SO₄^2-
Identify ONE substance being oxidised, ONE being reduced, ONE spectator ion, ONE oxidising agent and ONE reducing agent from the list of possible answers.
Note that not all of the listed substances need to be used and some may be used more than once.

Cr³⁺ ions
O₂
Cr⁺⁶ ions
S⁶⁺ ions
O^2- ions
S⁴⁺ ions
Cr₂

Substance being oxidised
Substance being reduced
Spectator ion
Oxidising agent
Reducing agent

1

Which ion is transported across the membrane to the cathode compartment?

Hydrogen ions

Chloride ions

Sodium ions

Oxygen ions

1

Name product B produced at the cathode.

Hydrogen

Carbon Dioxide

Oxygen

Chlorine

1

Water is a better reducing agent than chloride ions

Nokorɛ

Ɛnyɛ ampa

1

Name substance C

Chlroine

Brine

Sodium hydroxide

Hydrogen

1

What takes place at the anode

Reduction of of water

Oxidation of water

Reduction of chloride ions

Oxidation of chloride ions

Electrochemistry revision

An electrochemical cell is used to electroplate an iron spoon with nickel. Which ONE of the following half reactions takes place at the positive electrode of this cell?

Which of the following reactions is non-spontaneous?

Cr2O72- + SO32- → Cr3+ + SO42- Identify ONE substance being oxidised, ONE being reduced, ONE spectator ion, ONE oxidising agent and ONE reducing agent from the list of possible answers. Note that not all of the listed substances need to be used and some may be used more than once.

Which ion is transported across the membrane to the cathode compartment?

Name product B produced at the cathode.

Water is a better reducing agent than chloride ions

Name substance C

What takes place at the anode

An electrochemical cell is used to electroplate an iron spoon with nickel. Which ONE of the following half reactions takes place at the positive electrode of this cell?

Which of the following reactions is non-spontaneous?

Cr2O72- + SO32- → Cr3+ + SO42- Identify ONE substance being oxidised, ONE being reduced, ONE spectator ion, ONE oxidising agent and ONE reducing agent from the list of possible answers. Note that not all of the listed substances need to be used and some may be used more than once.

Which ion is transported across the membrane to the cathode compartment?

Name product B produced at the cathode.

Water is a better reducing agent than chloride ions

Name substance C

What takes place at the anode

Cr₂O₇^2- + SO₃^2- → Cr³⁺ + SO₄^2-
Identify ONE substance being oxidised, ONE being reduced, ONE spectator ion, ONE oxidising agent and ONE reducing agent from the list of possible answers.
Note that not all of the listed substances need to be used and some may be used more than once.

Cr₂O₇^2- + SO₃^2- → Cr³⁺ + SO₄^2-
Identify ONE substance being oxidised, ONE being reduced, ONE spectator ion, ONE oxidising agent and ONE reducing agent from the list of possible answers.
Note that not all of the listed substances need to be used and some may be used more than once.