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
11–20 of 136 · Hard
Question 11
5 marks · Hard
Answer and see the solution →Francium is a Group 1 alkali metal that has never been seen directly. Chemists use trends to predict its properties.
(a)[1 mark]State the expected physical appearance of francium when freshly cut.
(b)[2 marks]Explain why francium would be stored under oil if it could be collected in the laboratory.
(c)[2 marks]Describe and explain what you would expect to happen if francium was dropped into water.
Question 12
2 marks · Hard
Answer and see the solution →Predict whether francium would form coloured or colourless compounds in water, and explain your answer.
Question 13
7 marks · Hard
Answer and see the solution →This question is about the reactions of rubidium and caesium with water and the reactions of Group 1 metals with air.
(a)[3 marks]Describe what you would observe when a small piece of caesium is added to water. Explain your answer in terms of the position of caesium in Group 1.
(b)[2 marks]Sodium reacts with oxygen in the air to form a white solid of sodium oxide. Write a balanced chemical equation for this reaction, including state symbols.
(c)[2 marks]Caesium oxide is also a white solid. Predict its formula and give a reason for your answer.
Question 14
4 marks · Hard
Answer and see the solution →A student investigates Group 1 (alkali) metals and their compounds.
(a)Rubidium and caesium are placed below potassium in Group 1 of the Periodic Table. Predict and explain how the reaction of caesium with water is expected to be different from lithium, sodium, and potassium.
(b)[2 marks]The student has solid samples of lithium, sodium, and potassium. She cuts a fresh surface and leaves each in air. State what she would observe for each metal after a few minutes. Explain the reason for any differences in what she sees.
(c)[2 marks]Group 1 metal ions form colourless compounds unless the other ion is coloured. The student prepares potassium sulfate crystals and notices that the crystals are white and dissolve easily in water. Give two reasons, based on the properties of Group 1 metal compounds, to explain these observations.
Question 15
2 marks · Hard
Answer and see the solution →State the physical state and the colour of bromine at room temperature. Give one property of halogens that is the same for chlorine, bromine, and iodine.
Question 16
5 marks · Hard
Answer and see the solution →This question is about the reactivity of halogens and their displacement reactions.
(a)[1 mark]Write a balanced chemical equation for the reaction between bromine and potassium iodide solution.
(b)[2 marks]Explain why a reaction occurs between bromine and potassium iodide solution. Refer to the reactivity of the halogens in your answer.
(c)[1 mark]Describe what you would see during this reaction.
(d)[1 mark]Name the solution you would use to confirm the presence of iodine formed in this reaction. State the colour observed.
Question 17
2 marks · Hard
Answer and see the solution →A science teacher has three sealed containers, each holding one of the following halogens at room temperature (25°C):
(a)[1 mark]One container holds a halogen which is a red-brown liquid at room temperature. Name this halogen and state its physical state at room temperature.
(b)[1 mark]Another container holds a halogen that is a grey-black solid at room temperature. Name this halogen and state its colour at room temperature.
Question 18
2 marks · Hard
Answer and see the solution →Potassium bromide solution is added to separate solutions of chlorine and iodine. Describe what you would observe in each case, and explain why these observations are different.
Question 19
5 marks · Hard
Answer and see the solution →A student adds solutions of bromine and iodine to separate samples of potassium chloride and potassium iodide. The results are summarised below:
Summary of Observed Colour Changes Added halogen solution Potassium chloride solution Potassium iodide solution Bromine No change Brown colour appears Iodine No change No change Use the information and your knowledge of halogen reactivity to answer the following.
(a)[1 mark]Write a balanced chemical equation for the reaction that occurs when bromine solution is added to potassium iodide solution.
(b)[2 marks]Explain why there is no reaction when bromine solution is added to potassium chloride solution.
(c)[2 marks]Describe and explain the difference in the observations when bromine and iodine solutions are added to potassium iodide solution.
Question 20
2 marks · Hard
Answer and see the solution →State and explain the trend in the reactivity of chlorine, bromine and iodine as shown by their displacement reactions.