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
341–350 of 374 · Normal
Question 341
4 marks · Normal
Answer and see the solution →A student is given a colourless liquid and asked to determine if it is pure water. The student has access to anhydrous copper(II) sulfate, a thermometer, a beaker, and a Bunsen burner.
(a)[2 marks]Describe how the student could use anhydrous copper(II) sulfate to test whether the liquid contains water.
(b)[1 mark]State the colour change that would be seen if water is present.
(c)[1 mark]Describe how the student can use a thermometer and a Bunsen burner to test if the water is pure.
Question 342
3 marks · Normal
Answer and see the solution →A student measures the volume of a gas collected during a chemical reaction. She suspects it is ammonia. The laboratory temperature is 22°C and the gas is bubbled through 20 cm³ of water. The final pH of the water is found to be 12.2. Pure water has a pH of 7.0.
By how many units did the pH of the water increase? What does this pH reading suggest about the nature of the gas?
Question 343
3 marks · Normal
Answer and see the solution →Water found in a river is tested using anhydrous copper(II) sulfate. The solid turns blue. Explain why this test does not prove the water is pure, and suggest a further test to check its purity.
Question 344
4 marks · Normal
Answer and see the solution →A teacher tests four gases (W, X, Y, Z) using both damp red litmus paper and universal indicator paper. The results are shown.
Colour change results of gas tests Gas Red litmus paper Universal indicator paper W No change No change X Turns blue Turns blue Y No change Turns red Z Bleaches Bleaches (a)[2 marks]Which gas (W, X, Y, or Z) is most likely to be ammonia? Explain your answer.
(b)[2 marks]Suggest the identity of one other gas (Y or Z), giving a reason.
Question 345
2 marks · Normal
Answer and see the solution →A student is given a sample of gas and uses a piece of damp red litmus paper to test it.
State the result if the gas is ammonia. Explain why this result is seen.
Question 346
4 marks · Normal
Answer and see the solution →A student tests a solid substance to find out if it contains carbonate ions. The student adds dilute sulfuric acid and observes bubbles of gas. They collect the gas and pass it through limewater.
(a)[1 mark]Write the ionic equation for the reaction between carbonate ions () and sulfuric acid.
(b)[1 mark]State the identity of the gas formed.
(c)[1 mark]Describe the observed result when the gas is bubbled through limewater.
(d)[1 mark]Explain how these observations confirm that the original solid contained carbonate ions.
Question 347
4 marks · Normal
Answer and see the solution →A student is testing three white powders (A, B and C) for carbonate ions using dilute hydrochloric acid and limewater. Their results are shown:
Student's results for carbonate test Powder Acid added Fizzing observed? Limewater turns cloudy? A Yes Yes Yes B Yes No No C Yes Yes No (a)[2 marks]Which powder(s) definitely contain carbonate ions? Explain your answer.
(b)[2 marks]Suggest a reason why powder C showed fizzing but did not turn limewater cloudy.
Question 348
1 mark · Normal
Answer and check →Which observation indicates the presence of carbonate ions when dilute hydrochloric acid is added to a solid sample?
- A.The sample turns blue
- B.A green precipitate forms
- C.Effervescence (bubbles of gas) occurs
- D.The temperature falls
Question 349
2 marks · Normal
Answer and see the solution →Complete these sentences about the test for carbonate ions. (1) When dilute acid is added to a carbonate compound, __________ is given off. (2) This gas can be tested using __________.
Question 350
4 marks · Normal
Answer and see the solution →A teacher places a small amount of white powder in a test tube and adds dilute nitric acid. Bubbles appear. To confirm the identity of the gas, another experiment is performed with limewater.
(a)[1 mark]Write the formula for the ion being tested.
(b)[1 mark]State the name and formula of the gas formed.
(c)[1 mark]Describe the chemical test for this gas.
(d)[1 mark]State the positive result for this test.