This question is about displacement and redox reactions.
The displacement reaction between magnesium and iron(III) oxide has a high activation energy.
What is meant by 'activation energy'?
A mixture contains 1.20 kg1.20\text{ kg}1.20 kg of magnesium and 4.50 kg4.50\text{ kg}4.50 kg of iron(III) oxide.
The equation for the reaction is:
3Mg+Fe2O3→3MgO+2Fe 3\text{Mg} + \text{Fe}_2\text{O}_3 \rightarrow 3\text{MgO} + 2\text{Fe} 3Mg+Fe2O3→3MgO+2FeShow that magnesium is the limiting reactant.
Relative atomic masses (ArA_rAr): O=16\text{O} = 16O=16, Mg=24\text{Mg} = 24Mg=24, Fe=56\text{Fe} = 56Fe=56
Magnesium displaces zinc from zinc sulfate solution.
Complete the ionic equation for the reaction. You should include state symbols.
Mg(s)+Zn2+(aq)→________+________ \text{Mg(s)} + \text{Zn}^{2+}\text{(aq)} \rightarrow \text{\_\_\_\_\_\_\_\_} + \text{\_\_\_\_\_\_\_\_} Mg(s)+Zn2+(aq)→________+________Explain why the reaction between magnesium atoms and zinc ions is both oxidation and reduction.
38 exam-style questions on AQA GCSE Chemistry 3.2 Use of amount of substance in relation to masses of pure substances, covering 3.2.1 Moles (HT only), 3.2.2 Amounts of substances in equations (HT only), 3.2.3 Using moles to balance equations (HT only), 3.2.4 Limiting reactants (HT only), and 3.2.5 Concentration of solutions. Each one has a worked solution and a mark scheme showing where the marks go.