Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Chemical Formulae, Equations and Calculations Part 2
144 practice questions
Topics covered
- Calculations involving gas volumes19 practice questions
- Calculating the volume of a certain number of moles19 practice questions
- Using the molar volume in calculations with chemical equations19 practice questions
- Concentrations of solutions19 practice questions
- Calculations with equations involving solutions19 practice questions
- The standard calculation19 practice questions
- Reversing the calculations20 practice questions
Practice questions
61–61 of 61 · Normal
Question 61
6 marks · Normal
Answer and see the solution →A chemistry class investigates the reaction between solid calcium carbonate and dilute sulfuric acid. The reaction is:
(a)[2 marks]Explain why, after a short time, the reaction between calcium carbonate and dilute sulfuric acid slows down, even though there is still acid present.
(b)[2 marks]A student wants to calculate the concentration (in mol/dm³) of sulfuric acid if 5.0 g of CaCO3 is completely reacted using 250 cm³ of acid. (Ar: Ca = 40, C = 12, O = 16)
(c)[2 marks]The same student collects the carbon dioxide produced. Explain how they can use the volume of CO₂ collected at rtp to check if the reaction went to completion.