Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Reactions of acids
18 practice questions
Practice questions
11–18 of 18
Question 11
4 marks · Normal
Answer and see the solution →The table shows observations during reactions between different metals and dilute acids:
Observations when metals react with acids Metal Acid Observation Magnesium Hydrochloric acid Rapid fizzing, heat produced, magnesium disappears Iron Sulfuric acid Slow fizzing, little heat, iron remains after reaction Zinc Hydrochloric acid Moderate fizzing, slow disappearance of metal (a)[2 marks]Which metal is the least reactive based on the observations? Give a reason for your answer.
(b)[2 marks]Write a balanced chemical equation for the reaction between magnesium and hydrochloric acid.
Question 12
1 mark · Normal
Answer and check →Which statement about acids and bases is correct?
- A.An acid is a substance that accepts a proton.
- B.A base is a substance that donates a proton.
- C.An acid is a proton donor and a base is a proton acceptor.
- D.A base is a proton donor and an acid is a proton acceptor.
Question 13
2 marks · Normal
Answer and see the solution →Name the gas formed when a metal such as magnesium reacts with dilute hydrochloric acid. State the test for this gas.
Question 14
4 marks · Normal
Answer and see the solution →The following questions concern acids and bases.
(a)[1 mark]Define the term 'base' in terms of proton transfer.
(b)[1 mark]Complete the following equation for a reaction between an acid and a base:
(c)[2 marks]Explain, in terms of proton transfer, what happens in this reaction.
Question 15
3 marks · Normal
Answer and see the solution →Magnesium reacts with dilute sulfuric acid to produce magnesium sulfate and hydrogen gas according to the equation:
Calculate the maximum mass of magnesium sulfate (MgSO₄) that can be formed by completely reacting 2.40 g of magnesium with excess dilute sulfuric acid.
Give your answer to 2 decimal places. (Relative atomic masses: Mg = 24.0, S = 32.1, O = 16.0)
Question 16
2 marks · Hard
Answer and see the solution →Sodium carbonate reacts with dilute hydrochloric acid.
Write the word equation for this reaction and name the gas produced.
Question 17
5 marks · Hard
Answer and see the solution →A piece of magnesium ribbon is added to dilute ethanoic acid in a test tube.
(a)[2 marks]Describe what you would observe during the reaction.
(b)[2 marks]Write a balanced chemical equation for this reaction.
(c)[1 mark]State one way you could test the gas given off and describe the result you would expect.
Question 18
2 marks · Hard
Answer and see the solution →In terms of proton transfer, explain the difference between an acid and a base.