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

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Question 17
Medium

This question is about extraction and displacement reactions.

a.

The reduction of titanium(IV) chloride with magnesium has a high activation energy.

What is meant by 'activation energy'?

[1]
b.

A reaction mixture contains 0.36 kg0.36\text{ kg}0.36 kg of magnesium and 1.52 kg1.52\text{ kg}1.52 kg of titanium(IV) chloride.

The equation for the reaction is:

TiCl4+2Mg→Ti+2MgCl2\text{TiCl}_4 + 2\text{Mg} \rightarrow \text{Ti} + 2\text{MgCl}_2TiCl4​+2Mg→Ti+2MgCl2​

Show that magnesium is the limiting reactant.

Relative atomic masses (ArA_rAr​): Mg=24\text{Mg} = 24Mg=24, Cl=35.5\text{Cl} = 35.5Cl=35.5, Ti=48\text{Ti} = 48Ti=48

[5]
c.

Magnesium displaces copper from copper(II) sulfate solution.

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

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

[2]
d.

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

[2]

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

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