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
171–180 of 423 · Normal
Question 171
1 mark · Normal
Answer and check →Which of the following could be a method for determining the empirical formula of a metal oxide?
- A.Burning the metal in air and weighing the increase in mass
- B.Measuring the temperature before and after mixing with water
- C.Electrolysing the metal and collecting the gas
- D.Testing the metal with universal indicator
Question 172
2 marks · Normal
Answer and see the solution →Write the balanced chemical equation, with state symbols, for the reaction of calcium carbonate with dilute nitric acid to form calcium nitrate, carbon dioxide, and water.
Question 173
4 marks · Normal
Answer and see the solution →Answer the questions about calcium hydroxide, Ca(OH)2.
(a)[1 mark]State the relative atomic masses (Ar) for Ca, O, and H.
(b)[2 marks]Calculate the relative formula mass (Mr) of Ca(OH)2.
(c)[1 mark]What mass of Ca(OH)2 is present in 0.5 mol of the compound?
Question 174
2 marks · Normal
Answer and see the solution →Calculate the volume, in dm³, of 0.25 moles of nitrogen gas, N₂, at room temperature and pressure (rtp).
Question 175
4 marks · Normal
Answer and see the solution →Calcium carbonate reacts with hydrochloric acid as shown in the equation:
(a)[2 marks]State the volume of carbon dioxide gas produced (in cm³ at rtp) from 0.10 mol of calcium carbonate.
(b)[2 marks]Give one reason why the actual volume of gas collected might be less than the calculated value.
Question 176
3 marks · Normal
Answer and see the solution →Propane burns in oxygen according to the equation:
Calculate the total volume, in dm³, of carbon dioxide gas formed at rtp when 4.4 g of propane reacts completely. (M_r(C_3H_8) = 44)
Question 177
3 marks · Normal
Answer and see the solution →A student claims that 48 dm³ of hydrogen gas at rtp contains twice as many molecules as 24 dm³ of oxygen gas at rtp.
Is the student correct? Explain your answer.
Question 178
4 marks · Normal
Answer and see the solution →The table below shows the volume of different gases collected at rtp from several experiments.
Volumes of gases collected Experiment Gas Moles used Volume collected (dm³) 1 H₂ 0.50 12.0 2 O₂ 1.00 24.2 3 CO₂ 0.25 6.2 (a)[2 marks]Identify which experiment gave a result closest to the expected molar volume at rtp. Show your working.
(b)[2 marks]Suggest one reason why experiment 3's result is slightly higher than the expected value.
Question 179
1 mark · Normal
Answer and check →Which statement about gas volumes at rtp is correct?
- A.One mole of any gas occupies 24 dm³ at rtp.
- B.One mole of any gas occupies 22.4 dm³ at rtp.
- C.One mole of oxygen gas occupies 12 dm³ at rtp.
- D.One mole of hydrogen gas occupies 44.8 dm³ at rtp.
Question 180
2 marks · Normal
Answer and see the solution →Ammonia, NH₃, is prepared by reacting nitrogen and hydrogen as shown:
Calculate the volume (in dm³) of hydrogen at rtp needed to react completely with 10.0 dm³ of nitrogen.