Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Inorganic Chemistry
869 practice questions
Topics covered
- The Alkali Metals85 practice questions
- The Halogens86 practice questions
- Gases in the Atmosphere86 practice questions
- Reactivity Series163 practice questions
- Extraction and Uses of Metals128 practice questions
- Acids, Alkalis and Titrations83 practice questions
- Acids, Bases and Salt Preparations156 practice questions
- Chemical Tests68 practice questions
Practice questions
631–640 of 869
Question 631
6 marks · Normal
Answer and see the solution →A teacher claims that both sodium hydroxide and sodium carbonate solutions can be used in titrations with hydrochloric acid, but there are important reasons to choose one over the other.
(a)[2 marks]Explain why sodium carbonate solution is considered an alkali, stating the ion responsible for its alkaline nature.
(b)[2 marks]Describe two reasons why, in a titration of hydrochloric acid, sodium hydroxide might be preferred over sodium carbonate.
(c)[2 marks]A student uses phenolphthalein as an indicator for a titration of sodium carbonate with hydrochloric acid. Predict the colour change at the endpoint and what this shows about the pH change.
Question 632
1 mark · Easy
Answer and see the solution →State the products formed when iron reacts with dilute hydrochloric acid.
Question 633
3 marks · Easy
Answer and see the solution →Answer the following questions about acids and bases in terms of proton transfer.
(a)[1 mark]Define an acid in terms of proton transfer.
(b)[1 mark]Define a base in terms of proton transfer.
(c)[1 mark]State whether ammonia (NH₃) acts as an acid or a base when it reacts with hydrogen chloride gas. Explain your answer in terms of proton transfer.
Question 634
2 marks · Easy
Answer and see the solution →Explain, in terms of proton transfer, why hydrochloric acid acts as an acid when it reacts with potassium hydroxide.
Question 635
3 marks · Easy
Answer and see the solution →The table shows the effects of adding different metals to dilute sulfuric acid.
Observations when metals are added to sulfuric acid Metal Observation Calcium Fizzes rapidly, gas produced, solid disappears Copper No reaction Iron Slow fizzing, solid gradually disappears (a)[1 mark]State which metal does not react with dilute sulfuric acid.
(b)[1 mark]Write the balanced chemical equation for the reaction that takes place with calcium.
(c)[1 mark]Name the gas produced in the reaction with calcium.
Question 636
1 mark · Easy
Answer and see the solution →In terms of proton transfer, what does a base do?
Question 637
3 marks · Easy
Answer and see the solution →The following statements are about reactions of acids with carbonates.
(a)[1 mark]Write a word equation for the reaction between nitric acid and calcium carbonate.
(b)[1 mark]State the name of the salt produced in this reaction.
(c)[1 mark]Name the other two products formed in this reaction.
Question 638
2 marks · Easy
Answer and see the solution →Hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH).
Define the terms acid and base in terms of proton transfer.
Question 639
2 marks · Normal
Answer and see the solution →State the products when zinc reacts with dilute sulfuric acid. Write a balanced chemical equation for this reaction.
Question 640
4 marks · Normal
Answer and see the solution →Answer the following about acids and bases.
(a)[1 mark]State the definition of an acid in terms of proton transfer.
(b)[1 mark]State the definition of a base in terms of proton transfer.
(c)[2 marks]Ammonia reacts with hydrochloric acid to form ammonium chloride. Write an equation for the reaction and identify which species acts as the proton donor.