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- 1. Multiple ChoiceWhat is electrolysis?breaking down of a compound using a currentmaking a compound using a current
- 2. Multiple ChoiceWhat kind of Electrical Current does Electroysis require?DirectIndirectAnternativeA alternating
- 3. Multiple ChoiceWhich statement correctly describes the 2 electrodes?The anode is negative and the cathode is positiveThe anode and cathode are both positiveThe anode is positive and the cathode is negativeThe anode and cathode are both negative.
- 4. Multiple ChoiceWhat is the name given to the solution that is being electrolysed?Salt solutionElectric solutionMineral solutionElectrolyte
- 5. Multiple ChoiceExplain why the electrolyte has to be a liquid.So the ions can moveSo the electrons can moveSo that it doesn't get too hotSo the fish are ok
- 6. Multiple Choice
It is essential that the electrolyte is a liquid so that...
Charged ions can migrate towards the electrodes.
Charged ions can migrate towards the electrodes.
The solution can move around.
The current can flow through it.
- 7. Multiple ChoiceWhat happens at the positive electrode?Positive non-metal ions are attractedPositive metal ions are attractedNegative non-metal ions are attractedNegative metal ions are attracted
- 8. Multiple ChoicePositive ions (cations) will move towards the cathode (-) where they will discharge by....Breaking apartLosing electronsClumping together.Gaining electrons
- 9. Multiple ChoiceWhen NaCl solution is electrolysed what has forms at the anode?HydrogenOxygenChlorineSodium
- 10. Multiple ChoiceWhat does the Cathode (-) do to ions?Give electrons to the Positive ions to turn them back into atomsTake electrons from the positive ions?Turn ions back into atoms by removing electronsTurn atoms into ions by adding electrons
- 11. Multiple ChoiceWhat 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
Why is electrolysis of aqueous (dissolved) solutions more complicated than molten?
Water is messy
Water contributes hydrogen and hydroxide ions to the electrolyte
It is easier to dissolve some substances in water than to melt them
- 13. Multiple ChoiceIn an aqueous solution of copper chloride, which substance is produced at the positive electrodecopperchlorineoxygenchloride
- 14. Multiple Choice
In an aqueous solution of copper chloride, which substance is produced at the negative electrode
copper
chlorine
oxygen
chloride
- 15. Multiple Choice
A
B
C
D
- 16. Multiple Choice
A
B
C
D
- 17. Multiple Choice
A
B
C
D
- 18. Multiple ChoiceWhat is an ore?a solid metala rock cantaining a metal combined with other elementsan elementan object used to row a boat
- 19. Multiple ChoiceWhat is the name of the positive electrode?cathodeanode
- 20. Multiple ChoiceWhat is the name of the negative electrode?cathodeanode
- 21. Multiple ChoiceThe negatively charged ions migrate toward the ________.anodecathode
- 22. Multiple ChoiceThe positively charged ions migrate toward the ________.anodecathode
- 23. Multiple ChoiceWhich of these elements is unlikely to be found native?goldplatinumaluminiumsilver
- 24. Multiple ChoiceWhat is the removal of oxygen from a substance called?reductionextractionelectrolysisoxidation
- 25. Multiple ChoiceWhat is the addition of oxygen to a substance called?decompositionreductionoxidationextraction
- 26. Multiple ChoiceWhich element cannot be extracted from its ore by reduction with carbon?ironaluminiumcopperlead
- 27. Multiple ChoiceWhich series is used to predict the reactions of metals with carbon and other elements?reactionary seriesreaction seriesredox seriesreactivity series
- 28. Multiple ChoiceWhat is the name of the process that uses electricity to separate the elements in a compound?reductionelectrolysisextractionmining
- 29. Multiple ChoiceHow could you extract sodium from molten sodium chloride?reduction by carbonelectrolysisdecompositionoxidation
- 30. Multiple Choice
The electrodes in electrolysis of aluminium are made of
Steel
Anodes
Graphite
Plastic
- 31. Multiple Choice
What do you add to aluminium ore to reduce its melting temperature?
Dendrite
Malachite
Bauxite
Cryolite
- 32. Multiple Choice
Anions get discharged by ________ electrons at the ___________
gaining, cathode
losing, anode
gaining, anode
losing, cathode
- 33. Multiple Choice
What is the gas produced at the anode during the electrolysis of very dilute hydrochloric acid?
water
oxygen
hydrogen
chlorine
- 34. 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-
- 35. 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-
- 36. Multiple Choice
What ions are present in molten aluminium oxide?
Al3+, O2-, H+, OH-
Al3+, O2-
Al3+, OH-
- 37. 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.
- 38. Multiple ChoiceIn an aqueous solution of copper chloride, which ions are attracted to the negative electrode?Cu2+ and Cl- and H+ and OH-Cu2+ and H+Cl- and OH-Cu2+
- 39. Multiple Choice
Oxidation is loss of electron. Where does oxidation take place during electrolysis.
At anode
In the solution
At cathode
In the circuit
- Answer choicesTagsAnswer choicesTags