Sec 4 Chemistry Metals & Reactivity topical questions

Write the reactivity series in order, most reactive first, choosing from: copper, potassium, iron, magnesium, gold.

Complete: metals above hydrogen in the reactivity series react with dilute acids to give a salt and which gas?

Name the ore of iron used in the blast furnace and state what the limestone is for.

State two reasons for recycling metals.

Explain, using the structure of metals, why copper can conduct electricity when solid and can be hammered into sheets.

Experiments on three metals P, Q and R give these results: P fizzes in cold water; Q reacts with steam but not with cold water; R shows no reaction with steam, water or dilute acid.

1. (a)Rank P, Q and R in order of reactivity, most reactive first.[2]
2. (b)Suggest an identity for Q from the reactivity series.[1]
3. (c)Write the equation for P reacting with dilute hydrochloric acid if P is calcium.[2]

Explain why aluminium is extracted by electrolysis but iron is extracted in a blast furnace.

In the blast furnace, write equations for (a) the burning of coke, (b) the formation of the reducing agent from carbon dioxide, (c) the reduction of iron(III) oxide, and (d) the formation of slag from calcium oxide and silica.

Aluminium appears highly reactive in the reactivity series, yet aluminium saucepans are used for cooking every day.

A blast furnace processes 1000 tonnes of pure iron(III) oxide ore. (Fe: 56, O: 16.)

1. (a)Calculate the mass of iron obtainable from the ore (theoretical, Fe₂O₃ → 2Fe).[3]
2. (b)State why the actual mass of iron produced is lower than the theoretical value.[1]
3. (c)Calculate the theoretical mass of iron from 1000 tonnes of iron(II) oxide, FeO, instead.[2]

Zinc is above iron in the reactivity series. Explain, with reference to both protection methods, why a galvanised (zinc-coated) steel bucket resists rusting even when scratched, but a paint-coated steel bucket rusts as soon as the paint chips.

A town council plans a metal recycling drive and must choose between prioritising steel cans or aluminium cans.

1. (a)State two environmental benefits and one economic drawback of recycling metals generally.[3]
2. (b)Explain why aluminium cans are the higher-value recycling target.[2]
3. (c)State one practical way households can help the sorting problem.[1]