Aluminum Properties – Question and Answer
25 Aluminium is used to make saucepans because of its apparent lack of reactivity.
Which property of aluminium explains its unreactivity?
A It has a high electrical conductivity.
B It has a low density.
C It has a surface layer of oxide.
D It is in Group III of the Periodic Table.
26 In the graph, curve 1 was obtained by observing the decomposition of 100 cm3 of 1.0 mol/dm3 hydrogen peroxide solution, catalysed by manganese(IV) oxide.
Which alteration to the original experimental conditions would produce curve 2?
A lowering the temperature
B adding some 0.1 mol/dm3 hydrogen peroxide solution
C using less manganese(IV) oxide
D using a different catalyst
27 The diagram shows the electrolysis of aqueous copper(II) sulfate using copper electrodes.
Which graph shows how the mass of the cathode changes during electrolysis?
28 The energy diagram for the reaction between sodium hydroxide and hydrochloric acid is shown.
What can be deduced from the diagram?
A Heat is needed to start the reaction.
B The products contain less energy than the reactants.
C The reaction is rapid.
D The OH– ions have more energy than the H+ ions.
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