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WorksheetsElectroplating
Total questions: 15
Worksheet time: 8mins
If the electrode is not inert, the one that will be oxidised is the ... itself.
(a)
Which electrode is classified as inert?
Copper
Iron
Graphite
Tin
Which statement below is correct about metal refining?
Impure metal should be put in cathode
Pure metal is put in anode
Metal will be transferred from cathode to anode
Metal will be transferred from anode to cathode
Which one is not the benefit of electroplating?
Prevent corrosion
Improve its appearance
Make it a better electrical conductor
Hold their value over time
A metallic object is electroplated with copper using a solution of copper(II) sulfate. Which statement is correct?
The positive electrode increases in mass.
The concentration of Cu2+ ions in the solution decreases.
Reduction occurs at the positive electrode.
The reaction occurring at the negative electrode is Cu2+ + 2e– --> Cu.
Which are used for the electroplating of a metal spoon with Copper?
I. an electrolyte containing aqueous Copper(II) ions
II. a Copper anode (positive electrode)
III. a Copper cathode (negative electrode)
I and II only
I and III only
II and III only
I, II and III
The diagram shows a failed attempt to copper-plate a pan.
Which action will plate the pan with copper?
Cooling the copper sulfate solution in an ice bath
Heating the copper sulfate solution to boiling point
Increasing the voltage from 3 V to 6 V
Making the pan the cathode and the copper the anode
The diagram shows the electroplating of a steel object.
A student made the following statements.
1. The object turns a reddish-brown colour.
2. The copper sulfate solution changes to a paler blue colour.
3. The copper electrode becomes smaller.
Which statements are correct?
1, 2 and 3
1 and 2 only
1 and 3 only
2 and 3 only
An object is electroplated with silver using an aqueous silver salt as the electrolyte. Which set of conditions is used?
A
B
C
D
Which metal could not be used for electroplating by using an aqueous solution?
Chromium
Copper
Silver
Sodium
Which row about a hydrogen–oxygen fuel cell is correct?
A
B
C
D
Which gases are used to generate electricity in a fuel cell?
Carbon dioxide and oxygen
Hydrogen and methane
Hydrogen and oxygen
Methane and carbon dioxide
Which statement about hydrogen fuel cells is correct?
Hydrogen fuel cells do not produce carbon dioxide.
Hydrogen fuel cells do not need oxygen.
The waste from a hydrogen fuel cell is an acidic gas.
The reaction in a fuel cell is endothermic.
Which row shows the waste products released from the exhaust of a vehicle powered using a hydrogen–oxygen fuel cell?
A
B
C
D
Which statements about hydrogen and oxygen are correct?
A
B
C
D
