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
21–30 of 374 · Normal
Question 21
1 mark · Normal
Answer and check →Which compound is most likely to form a colourless solution in water?
- A.Potassium chloride
- B.Copper(II) sulphate
- C.Iron(III) nitrate
- D.Nickel(II) chloride
Question 22
2 marks · Normal
Answer and see the solution →State the formula and appearance of the solid produced when lithium burns in air.
Question 23
4 marks · Normal
Answer and see the solution →Group 1 compounds tend to dissolve easily in water.
(a)[1 mark]Describe what would be seen when sodium nitrate is dissolved in water.
(b)[2 marks]Explain why the solution formed is colourless.
(c)[1 mark]State an example of a group 1 compound that is not white or colourless, and give the reason for its colour.
Question 24
3 marks · Normal
Answer and see the solution →A student places a piece of sodium metal weighing 2.3 g in air and leaves it to react until it forms a layer of sodium oxide. The equation for the reaction is:
Calculate the mass of sodium oxide formed from 2.3 g of sodium, assuming all of the sodium reacts completely. (Relative atomic masses: Na = 23, O = 16)
Question 25
2 marks · Normal
Answer and see the solution →State two physical properties you would expect francium to have, based on its position in Group 1 of the Periodic Table.
Question 26
4 marks · Normal
Answer and see the solution →Francium has never been seen, but chemists can predict its properties using trends in Group 1. Answer the following about francium.
(a)[1 mark]State the formula of the hydroxide formed when francium reacts with water.
(b)[2 marks]Describe what you would observe when a piece of francium is added to water.
(c)[1 mark]Explain why francium reacts more violently with water than potassium.
Question 27
3 marks · Normal
Answer and see the solution →The melting point of alkali metals decreases as you move down the group:
Melting points of Group 1 elements Element Atomic number Melting point / °C Lithium 3 181 Sodium 11 98 Potassium 19 64 Rubidium 37 39 Caesium 55 29 Francium 87 ? Use the trend shown in the table to estimate a value for the melting point of francium.
Question 28
3 marks · Normal
Answer and see the solution →Explain why francium compounds are expected to be colourless and soluble in water.
Question 29
4 marks · Normal
Answer and see the solution →The graph below shows the melting points of some alkali metals against their atomic numbers.
Melting points of alkali metals (a)[1 mark]Describe the trend shown by the graph.
(b)[1 mark]Estimate the melting point of francium (atomic number 87) using the graph.
(c)[2 marks]Explain how you used the data to make your estimate.
Question 30
1 mark · Normal
Answer and check →Which statement best predicts what would happen if a small piece of francium was exposed to air at room temperature?
- A.It would remain shiny and not react.
- B.It would tarnish almost instantly.
- C.It would slowly change colour over several days.
- D.It would melt and form a green compound.