The diagram shows a section of an overhead power cable. Which statement explains why a particular substance is used?
A Aluminium has a low density and is a good conductor of electricity.
B Ceramic is a good conductor of electricity.
C Steel can rust in damp air.
D Steel is more dense than aluminium.
The diagram shows the electrolysis of concentrated hydrochloric acid and concentrated aqueous sodium chloride using carbon electrodes.
At which electrode(s) is hydrogen produced?
A electrode 1 only
B electrodes 1 and 3
C electrode 2 only
D electrodes 2 and 4
What are the electrode products when molten silver iodide is electrolysed between inert electrodes?
A
B
C
D
Copper and hydrogen can each be formed by electrolysis. At which electrodes are these elements formed?
The diagram shows a failed attempt to copper-plate a pan.
Which action will plate the pan with copper?
A cooling the copper sulfate solution in an ice bath
B heating the copper sulfate solution to boiling point
C increasing the voltage from 3 V to 6 V
D 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?
A 1, 2 and 3
B 1 and 2 only
C 1 and 3 only
D 2 and 3 only
The diagram shows an electrolysis experiment. During the electrolysis, sodium was formed at electrode P and chlorine at electrode Q.
Which row correctly identifies P, Q and X?
The diagram shows apparatus for plating a spoon with silver.
Which statement is not correct?
A Silver would stick to the spoon because it is a very reactive metal.
B The electrolyte would be a silver salt dissolved in water.
C The metal electrode would be made from silver.
D The spoon would be connected to the negative terminal of the power supply.
Which metal could not be used for electroplating by using an aqueous solution?
A chromium
B copper
C silver
D sodium
Which products are formed at the electrodes when a concentrated solution of sodium chloride is electrolysed?
A student wishes to electroplate an object with copper. Which row is correct?
In the electrolysis shown, chlorine is produced at W and sodium at X.
Which labels are correct?
Which substance will not conduct electricity?
A aluminium
C plastic
D steel
Electrical cables are made from either ……1……, because it is a very good conductor of electricity, or from……2……, because it has a low density. Overhead cables have a ……3…… core in order to give the cable strength.
Which words correctly complete gaps 1, 2 and 3?
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