Electrochemistry revision

Last updated about 1 year ago

9 questions

Untitled Section

Consider the following mebrane cell. Concentrated brine is pumped into the anode compartment.

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Electrochemistry revision

Last updated about 1 year ago

9 questions

Untitled Section

Question 1

3

4

5

6

Question 2

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-

Question 3

Which of the following reactions is non-spontaneous?

A

B

C

D

Question 4

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.

Cr3+ ions
O2
Cr+6 ions
S6+ ions
O2- ions
S4+ ions
Cr2

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

Consider the following mebrane cell. Concentrated brine is pumped into the anode compartment.

Question 5

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

Hydrogen ions

Chloride ions

Sodium ions

Oxygen ions

Question 6

Name product B produced at the cathode.

Hydrogen

Carbon Dioxide

Oxygen

Chlorine

Question 7

Water is a better reducing agent than chloride ions

True

False

Question 8

Name substance C

Chlroine 

Brine 

Sodium hydroxide

Hydrogen 

Question 9

What takes place at the anode

Reduction of of water

Oxidation of water 

Reduction of chloride ions

Oxidation of chloride ions 

Question 1

3

4

5

6

Question 2

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-

Question 3

Which of the following reactions is non-spontaneous?

A

B

C

D

Question 4

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.

Cr3+ ions
O2
Cr+6 ions
S6+ ions
O2- ions
S4+ ions
Cr2

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

Question 5

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

Hydrogen ions

Chloride ions

Sodium ions

Oxygen ions

Question 6

Name product B produced at the cathode.

Hydrogen

Carbon Dioxide

Oxygen

Chlorine

Question 7

Water is a better reducing agent than chloride ions

True

False

Question 8

Name substance C

Chlroine 

Brine 

Sodium hydroxide

Hydrogen 

Question 9

What takes place at the anode

Reduction of of water

Oxidation of water 

Reduction of chloride ions

Oxidation of chloride ions 

Electrochemistry revision

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

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.

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.