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
31–40 of 359 · Easy
Question 31
2 marks · Easy
Answer and see the solution →Room temperature is about 25°C. If francium has a melting point of 22°C, what state (solid or liquid) would you expect francium to be in at room temperature? Explain your answer with a calculation.
Question 32
1 mark · Easy
Answer and see the solution →State one physical property that francium is predicted to have, based on trends in Group 1 of the Periodic Table.
Question 33
5 marks · Easy
Answer and see the solution →This question is about alkali metals and their reactions with air and predictions for francium.
(a)[2 marks]A student weighs out 1.50 g of sodium and exposes it to air. The sodium rapidly forms a white compound. Give the formula for this compound and calculate the maximum mass that could be formed.
(b)[2 marks]Francium is even more reactive than potassium. Predict what you would observe if a piece of francium metal was freshly cut and left in the air, and explain your answer.
(c)[1 mark]Use the information about group trends to estimate whether francium would have a higher or lower melting point than potassium. Justify your answer.
Question 34
5 marks · Easy
Answer and see the solution →Answer the following about compounds of Group 1 metals and the properties of francium.
(a)[2 marks]State the typical colour and solubility in water for compounds of sodium and potassium.
(b)[2 marks]Give the formula and expected colour of the hydroxide formed when francium reacts with water.
(c)[1 mark]Suggest what you would observe when a solution of francium hydroxide is added to universal indicator.
Question 35
5 marks · Easy
Answer and see the solution →Rubidium (Rb) and caesium (Cs) are alkali metals placed below potassium in Group 1 of the Periodic Table.
(a)[1 mark]Rubidium reacts with water to produce rubidium hydroxide and hydrogen gas. Write a balanced equation, including state symbols, for this reaction.
(b)[2 marks]In an experiment, a student places a small piece of caesium in a trough containing 100 cm³ of water. The student collects the hydrogen gas given off and measures its volume as 45 cm³ at room temperature and pressure (rtp).
Calculate the number of moles of hydrogen gas produced. (Molar volume of gas at rtp = 24 000 cm³/mol)
(c)[2 marks]Caesium is stored under oil. State what would be observed if a freshly cut piece of caesium was quickly exposed to air, and explain why this observation occurs.
Question 36
4 marks · Easy
Answer and see the solution →(a)State one observation you would make when rubidium reacts with water.
(b)[1 mark]Potassium reacts with water to form potassium hydroxide and hydrogen. Write a balanced symbol equation for this reaction.
(c)[1 mark]Group 1 metal compounds are usually white or colourless solids. State the typical solubility in water of sodium hydroxide.
(d)[1 mark]Name the colour observed in a solution of potassium iodide.
(e)[1 mark]Explain why rubidium reacts more vigorously with water than sodium.
Question 37
1 mark · Easy
Answer and see the solution →State the physical state of bromine at room temperature.
Question 38
3 marks · Easy
Answer and see the solution →This question is about halogen reactions.
(a)[1 mark]Describe what happens when chlorine reacts with sodium metal.
(b)[1 mark]Name the compound formed in this reaction.
(c)[1 mark]Explain why sodium reacts with chlorine instead of iodine in terms of halogen reactivity.
Question 39
2 marks · Easy
Answer and see the solution →Explain, in terms of reactivity, why iron reacts more rapidly with chlorine than with bromine.
Question 40
3 marks · Easy
Answer and see the solution →The table below shows information about the appearance and melting points of chlorine, bromine, and iodine. Some data is missing.
Halogen Properties Halogen Colour at room temperature Physical state at room temperature Melting point (°C) Chlorine Pale green Gas -101 Bromine Liquid -7 Iodine Grey-black 114 (a)[2 marks]Complete the table: (i) the colour of bromine at room temperature, and (ii) the physical state of iodine at room temperature.
(b)[1 mark]Based on the table, describe the trend in melting points down the group.