Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Principles of Chemistry
991 practice questions
Topics covered
- States of Matter102 practice questions
- Elements, Compounds and Mixtures69 practice questions
- Atomic Structure108 practice questions
- The Periodic Table103 practice questions
- Chemical Formulae, Equations and Calculations Part 119 practice questions
- Chemical Formulae, Equations and Calculations Part 2144 practice questions
- Ionic Bonding143 practice questions
- Covalent Bonding68 practice questions
- Metallic Bonding19 practice questions
- Electrolysis198 practice questions
Practice questions
161–170 of 407 · Easy
Question 161
2 marks · Easy
Answer and see the solution →A student heats a crucible containing a strip of magnesium in air and finds an increase in mass after the reaction.
Explain why the mass increases, and how this method helps to determine the formula of magnesium oxide.
Question 162
3 marks · Easy
Answer and see the solution →The following table shows substances involved in a chemical reaction:
Substances in the reaction between iron(III) oxide and carbon monoxide Substance State Symbol iron(III) oxide carbon monoxide iron carbon dioxide Complete the table with the correct state symbols and write the balanced chemical equation including state symbols for the reaction where iron(III) oxide reacts with carbon monoxide to produce iron and carbon dioxide.
(a)[1 mark]Complete the table with the correct state symbols.
(b)[2 marks]Write the balanced chemical equation for this reaction, including state symbols.
Question 163
1 mark · Easy
Answer and check →State the relative formula mass (Mr) of water, H2O. (Ar: H = 1, O = 16)
Question 164
3 marks · Easy
Answer and see the solution →Answer the questions about carbon dioxide, CO2.
(a)[1 mark]State the relative atomic masses (Ar) for C and O.
(b)[1 mark]Calculate the relative formula mass (Mr) of CO2.
(c)[1 mark]What is the mass of 0.25 mol of carbon dioxide?
Question 165
2 marks · Easy
Answer and see the solution →Calculate the number of moles in 12.0 g of magnesium oxide, MgO. (Ar: Mg = 24, O = 16)
Question 166
1 mark · Easy
Answer and see the solution →State the volume, in dm³, occupied by one mole of any gas at room temperature and pressure (rtp).
Question 167
3 marks · Easy
Answer and see the solution →Hydrogen peroxide decomposes to form water and oxygen gas as shown:
(a)[1 mark]Write the stoichiometric ratio between hydrogen peroxide and oxygen in the equation above.
(b)[2 marks]Calculate the volume, in dm³, of oxygen gas produced at rtp from complete decomposition of 0.50 mol of hydrogen peroxide.
Question 168
2 marks · Easy
Answer and see the solution →Calculate the volume, in dm³, of 0.75 moles of carbon dioxide gas at room temperature and pressure (rtp).
Question 169
3 marks · Easy
Answer and see the solution →A student collects three different gases at rtp in three identical flasks. Data for the gases is shown below:
Volumes and types of gas collected at rtp Gas Volume collected (dm³) Moles collected Argon 1.0 ? Oxygen 0.5 ? Hydrogen 2.0 ? (a)[1 mark]Calculate the number of moles of argon collected.
(b)[1 mark]Calculate the number of moles of oxygen collected.
(c)[1 mark]Which gas sample contains the largest number of molecules? Explain your answer.
Question 170
1 mark · Easy
Answer and see the solution →What is the formula used to calculate the volume of a given amount of gas, in moles, at rtp?