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- 1. Multiple ChoiceWhat is the name of the positive electrode?cathodeanode
- 2. Multiple ChoiceWhat is the name of the negative electrode?cathodeanode
- 3. Multiple Choice
The negatively charged ions are attracted to the ________.
anode
cathode
- 4. Multiple Choice
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 mobile charge carriers in the molten state.
There are no ions in solid lead(II) bromide
- 5. Multiple Choice
In electrolytic cell that uses aqueous copper(II) sulfate as electrolyte and copper plates as electrodes, what is the product at the anode?
Oxygen gas and water
Copper metal
Copper(II) ions
Hydrogen gas
- 6. Multiple Choice
Anions get discharged by ________ electrons at the ___________
gaining, cathode
losing, anode
gaining, anode
losing, cathode
- 7. Multiple Choice
What is the gas produced at the anode during the electrolysis of very dilute hydrochloric acid?
water
oxygen
hydrogen
chlorine
- 8. Multiple ChoiceWhat is the product formed at the anode during the electrolysis of concentrated copper(II) chloride?copperchlorinehydrogenoxygen
- 9. Multiple Choice
Positive ions (cations) move towards the cathode (-) where they will discharge by....
Breaking apart
Losing electrons
Clumping together.
Gaining electrons
- 10. Multiple Choice
Choose the half-equation that shows the discharge of aluminium ion.
Al3+ - 3e- --> Al
Al2+ + 3e- --> Al
Al3+ + 3e- --> Al
Al3+ --> Al + 3e-
- 11. Multiple Choice
What is the half-equation for the discharge of hydroxide ions?
2O2- --> O2 + 4e-
OH- --> OH + e
4OH- --> 2H2O + O2 + 4e-
2H2O + O2 + 4e- --> 4OH-
- 12. Multiple Choice
What factors do not affect the products of electrolysis in the electrolysis of aqueous magnesium chloride using graphite electrodes?
position of ions in the electrochemical series
concentration of ions in the solution
type of electrodes
- 13. Multiple Choice
What ions are present in molten aluminium oxide?
Al3+, O2-, H+, OH-
Al3+, O2-
Al3+, OH-
- 14. Multiple Choice
Electroplating is an industrial process where objects are coated by a thin layer of a nonreactive metal by electrolysis. What should be used as the cathode in this process?
Graphite electrode
The electroplating metal
The object to be electroplated
Magnesium ribbon
- 15. Multiple Choice
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
- 16. Multiple Choice
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.
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