4.2 The reactivity series and displacement
5 exam questions worth 10 marks. Write your answer, open the mark scheme, then give yourself the marks you earned. Your answers are saved on this device.
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Which metal would NOT react with dilute hydrochloric acid?
Choose one answer.
Correct Not quite: the answer is Copper
Mark scheme
D
Model answer
D: copper is below hydrogen in the reactivity series.
Zinc is added to copper sulfate solution.
Describe what you would see and write the word equation.
Mark scheme
- blue colour fades / solution becomes colourless (1)
- pink-brown solid / copper forms on the zinc (1)
- zinc + copper sulfate → zinc sulfate + copper (1)
Model answer
The blue solution fades and a pink-brown coating of copper forms. zinc + copper sulfate → zinc sulfate + copper.
Explain why copper does not react with iron sulfate solution.
Mark scheme
- copper is less reactive than iron (1)
- so it cannot displace iron (1)
Model answer
Copper is below iron in the reactivity series, so it is less reactive and cannot displace iron from its compound.
A student adds metals X, Y and Z to solutions of each other's salts. X displaces Y and Z. Z displaces Y.
Put the metals in order of reactivity, most reactive first.
Mark scheme
- X, Z, Y (2)
- (one mark for X most reactive or Y least reactive)
Model answer
X is the most reactive (it displaces both), then Z (it displaces Y), and Y is the least reactive.
Explain, in terms of ions, why potassium is more reactive than magnesium.
Mark scheme
- potassium forms positive ions more easily (1)
- because it loses its outer electron more easily (1)
Model answer
Potassium has a greater tendency to form positive ions: it loses its outer electron more easily than magnesium loses its two outer electrons.
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