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Aluminum Properties – Question and Answer

05 May 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.

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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.

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Which graph shows how the mass of the cathode changes during electrolysis?

15

 

28        The energy diagram for the reaction between sodium hydroxide and hydrochloric acid is shown.

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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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Did you answer the Secondary Chemistry Tuition Question correctly?

 

1.C

2.B

3.D

4.B

 

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