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
821–830 of 869
Question 821
2 marks · Normal
Answer and see the solution →Describe how you would test a solid sample to show that it contains carbonate ions (). State what you would observe if carbonate ions are present.
Question 822
2 marks · Normal
Answer and see the solution →State the substance you would add to a sample to test for carbonate ions, and describe what you would observe if carbonate ions are present.
Question 823
4 marks · Normal
Answer and see the solution →A student is given a white powder thought to contain carbonate ions.
(a)[1 mark]The student adds dilute hydrochloric acid to the powder.
State what the student should observe if carbonate ions are present.
(b)[1 mark]The student collects the gas given off and bubbles it through limewater. What result would confirm the gas is carbon dioxide?
(c)[2 marks]Write the ionic equation for the reaction between carbonate ions and hydrochloric acid.
Question 824
3 marks · Normal
Answer and see the solution →A student tests 0.30 g of potassium carbonate ([K\ce{K2CO3}) powder with excess dilute hydrochloric acid. All of the carbonate reacts.
(a)[1 mark]Write the chemical equation, including state symbols, for the reaction between potassium carbonate and hydrochloric acid.
(b)[1 mark]Calculate the number of moles of potassium carbonate in 0.30 g. (Relative formula mass, , of \ce{K2CO3} = 138.0.)
(c)[1 mark]Calculate the volume of carbon dioxide gas produced at room temperature and pressure (RTP), in cm. (1 mole of gas at RTP occupies 24 000 cm.)
Question 825
2 marks · Hard
Answer and see the solution →A student is given a solution that may contain sodium carbonate. Describe two distinct observations the student would expect to make when dilute hydrochloric acid is added to this solution if carbonate ions are present.
Question 826
5 marks · Hard
Answer and see the solution →You are given a solid sample labelled 'unknown.' It could be one of the following: magnesium sulfate, sodium carbonate, or potassium chloride.
(a)[2 marks]Describe how you would carry out a chemical test to determine whether this solid contains carbonate ions. Include the reagents and apparatus you would use.
(b)[1 mark]Suppose the unknown is sodium carbonate. Write the ionic equation for its reaction with hydrochloric acid.
(c)[2 marks]Explain how you would confirm that the gas produced in the reaction is carbon dioxide.
Question 827
2 marks · Hard
Answer and see the solution →A solution of potassium carbonate is added to excess dilute nitric acid in a test tube. The student's teacher tells them to test any gas produced with limewater. Explain why limewater is used in this test and state the result that shows carbonate ions were present.
Question 828
1 mark · Easy
Answer and see the solution →State why nitric acid is added before silver nitrate when testing a solution for halide ions.
Question 829
3 marks · Easy
Answer and see the solution →(a)[1 mark]Describe what should be added to a solution to test for chloride ions using silver nitrate.
(b)[2 marks]State which chemical is added first and explain why that order is important in the test.
Question 830
2 marks · Easy
Answer and see the solution →A student adds silver nitrate solution to acidified solutions of three unknown salts. She observes the following: - Salt A: forms a white precipitate - Salt B: forms a cream precipitate - Salt C: forms a yellow precipitate Calculate the number of different halide ions identified and state the expected observation for each positive test.