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
181–190 of 423 · Normal
Question 181
4 marks · Normal
Answer and see the solution →Magnesium reacts with steam to produce magnesium oxide and hydrogen gas as shown:
(a)[2 marks]Calculate the number of moles of hydrogen gas produced when 2.40 g of magnesium completely reacts. (M_r(Mg) = 24)
(b)[2 marks]What is the volume (in dm³ at rtp) of hydrogen gas formed?
Question 182
2 marks · Normal
Answer and see the solution →A laboratory experiment produced 0.300 dm³ of oxygen gas. Convert this volume to cm³.
Question 183
4 marks · Normal
Answer and see the solution →Answer the questions about gases at room temperature and pressure (rtp).
(a)[1 mark]State the volume occupied by 1 mole of any gas at rtp in dm³.
(b)[1 mark]State the volume occupied by 1 mole of any gas at rtp in cm³.
(c)[2 marks]Is the volume occupied by 1 mole of a gas at rtp the same for all gases? Give a reason for your answer.
Question 184
3 marks · Normal
Answer and see the solution →Calculate the volume, in cm³, of 0.45 mol of helium gas at rtp. Show your working.
Question 185
4 marks · Normal
Answer and see the solution →The table shows the number of moles of different gases measured at rtp in a laboratory.
Number of moles of gases at rtp Gas Moles Oxygen 0.25 Neon 0.50 Argon 1.00 (a)[2 marks]For each gas, state the volume it would occupy at rtp in dm³.
(b)[1 mark]What is the volume in cm³ of 0.50 mol of neon gas at rtp?
(c)[1 mark]Explain why 1.00 mol of argon and 1.00 mol of oxygen have the same volume at rtp.
Question 186
1 mark · Normal
Answer and check →What is the volume, in dm³, of 0.75 mol nitrogen gas at rtp?
- A.18 dm³
- B.24 dm³
- C.32 dm³
- D.0.75 dm³
Question 187
2 marks · Normal
Answer and see the solution →You measured a gas volume as 500 cm³. Convert it into dm³ and explain how you did the conversion.
Question 188
4 marks · Normal
Answer and see the solution →Answer the following questions about the volume of gases at rtp.
(a)[1 mark]What is meant by the term 'molar volume'?
(b)[1 mark]State the molar volume at room temperature and pressure in dm³ and in cm³.
(c)[2 marks]A student says the molar volume of oxygen is different from that of carbon dioxide at rtp. Explain whether this statement is correct.
Question 189
3 marks · Normal
Answer and see the solution →A student wants to find out whether the volume given for a gas in a chemistry problem should be recorded in cm³ or dm³. They know that 1 dm³ is equal to 1000 cm³.
Explain which unit (cm³ or dm³) is more suitable for measuring the volume of a sample of air collected from a 3-litre container, and describe how to convert between these units.
Question 190
2 marks · Normal
Answer and see the solution →Calculate the volume, in cm³, of 0.16 g of oxygen gas (O₂) at room temperature and pressure. (Ar: O = 16; molar volume = 24,000 cm³ at rtp)