Use of amount of substance in relation to masses of pure substances

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Question 8
Medium

This question is about displacement reactions.

a.

The displacement reaction between aluminium and copper(II) oxide has a high activation energy.

What is meant by 'activation energy'?

[1]
b.

A mixture contains 0.50 kg0.50\text{ kg}0.50 kg of aluminium and 2.50 kg2.50\text{ kg}2.50 kg of copper(II) oxide.

The equation for the reaction is:

2Al+3CuO→Al2O3+3Cu2\text{Al} + 3\text{CuO} \rightarrow \text{Al}_2\text{O}_3 + 3\text{Cu}2Al+3CuO→Al2​O3​+3Cu

Show that aluminium is the limiting reactant.

Relative atomic masses (ArA_rAr​): O=16\text{O} = 16O=16, Al=27\text{Al} = 27Al=27, Cu=64\text{Cu} = 64Cu=64

[4]
c.

Zinc displaces copper from copper(II) sulfate solution.

Complete the ionic equation for the reaction. You should include state symbols.

Zn(s)+Cu2+(aq)→________+________\text{Zn(s)} + \text{Cu}^{2+}\text{(aq)} \rightarrow \text{\_\_\_\_\_\_\_\_} + \text{\_\_\_\_\_\_\_\_}Zn(s)+Cu2+(aq)→________+________

[2]
d.

Explain why the reaction between zinc atoms and copper(II) ions is both oxidation and reduction.

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Use of amount of substance in relation to masses of pure substances Questions

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