Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Reactions of metals with dilute acids
19 practice questions
Practice questions
1–8 of 8 · Easy
Question 1
1 mark · Easy
Answer and see the solution →When magnesium reacts with dilute hydrochloric acid, what gas is produced?
Question 2
3 marks · Easy
Answer and see the solution →(a)[1 mark]A student adds a piece of zinc to dilute hydrochloric acid. State one observation she might make.
(b)[2 marks]What test could be used to confirm the identity of the gas produced? State the result.
Question 3
2 marks · Easy
Answer and see the solution →A student uses 0.35 g of magnesium in a reaction with excess dilute hydrochloric acid. (Relative atomic mass, Mg = 24)
Calculate the number of moles of magnesium used. Give your answer to two decimal places.
Question 4
2 marks · Easy
Answer and see the solution →Explain, with reasons, why copper does not react when added to dilute hydrochloric acid, but magnesium reacts vigorously.
Question 5
3 marks · Easy
Answer and see the solution →The table shows the maximum temperatures reached when equal moles of different metals react with excess dilute hydrochloric acid.
Temperature changes for reactions of metals with acid Metal Initial temperature / °C Maximum temperature / °C Aluminium 18 29 Zinc 18 23 Iron 18 20 Copper 18 18 (a)[1 mark]Calculate the temperature change for zinc.
(b)[1 mark]Which metal was the least reactive? Use data to support your answer.
(c)[1 mark]Explain why the reaction with aluminium may need to be warmed before it proceeds quickly.
Question 6
3 marks · Easy
Answer and see the solution →(a)[1 mark]Give the general word equation for the reaction between a metal and a dilute acid.
(b)[2 marks]Potassium cannot safely be reacted with dilute acids in the laboratory. Explain why.
Question 7
1 mark · Easy
Answer and see the solution →State one observation that would indicate a metal is more reactive when it reacts with dilute hydrochloric acid compared to another metal.
Question 8
2 marks · Easy
Answer and see the solution →A student reacts 0.010 mol of zinc powder with 50 cm³ of dilute hydrochloric acid. The initial temperature is 20 °C and the maximum temperature is 28 °C.
(a)[1 mark]Calculate the temperature rise during the reaction.
(b)[1 mark]Explain, using the data, which metal would be more reactive: zinc (temperature rise 8°C) or iron (temperature rise 4°C, same conditions).