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
191–200 of 407 · Easy
Question 191
3 marks · Easy
Answer and see the solution →(a)[1 mark]Give the formula that links concentration (in mol/dm³), amount of substance (in mol), and volume of solution (in dm³).
(b)A student dissolves 0.080 mol of potassium nitrate (KNO₃) in enough water to make 0.40 dm³ of solution.
(i)[2 marks]Calculate the concentration of this potassium nitrate solution in mol/dm³.
Question 192
2 marks · Easy
Answer and see the solution →Calculate the amount of substance (in mol) in 200 cm³ of a solution with a concentration of 0.150 mol/dm³. Give your answer to 2 decimal places.
Question 193
2 marks · Easy
Answer and see the solution →A student claims that halving the volume of a solution, while keeping the amount of solute the same, will double its concentration. Explain why the student is correct. Use calculations in your answer.
Question 194
3 marks · Easy
Answer and see the solution →The following table shows the amounts and volumes for three different solutions of lead(II) nitrate.
Sample Amount (mol) Volume (dm³) A 0.10 0.50 B 0.20 0.80 C 0.04 0.20 (a)[1 mark]Calculate the concentration, in mol/dm³, for sample A.
(b)[1 mark]Calculate the concentration for sample B.
(c)[1 mark]Which sample has the highest concentration?
Question 195
1 mark · Easy
Answer and see the solution →Write the concentration, in words, for a solution described as 0.1 mol/dm³ sodium chloride.
Question 196
3 marks · Easy
Answer and see the solution →(a)A student wants to make 500 cm³ of a 0.08 mol/dm³ solution of calcium chloride (CaCl₂).
(i)[2 marks]Calculate the amount of CaCl₂ (in mol) needed.
(ii)[1 mark]State the volume, in dm³, of solution the student will prepare.
Question 197
2 marks · Easy
Answer and see the solution →A solution has a concentration of 0.25 mol/dm³. What volume of this solution (in cm³) contains 0.050 mol of solute? Show your answer to the nearest cm³.
Question 198
1 mark · Easy
Answer and see the solution →State the mass of sodium chloride, NaCl, produced when 0.025 mol of NaCl is formed in a reaction.
Question 199
3 marks · Easy
Answer and see the solution →A solution contains 0.30 mol/dm³ potassium chloride, KCl. 40 cm³ of this solution is measured out.
(a)[1 mark]Convert 40 cm³ to dm³.
(b)[2 marks]Calculate the number of moles of KCl in 40 cm³ of solution.
Question 200
2 marks · Easy
Answer and see the solution →The equation for a reaction is:
Calculate the number of moles of silver nitrate, AgNO₃, required to react with 0.030 mol of sodium carbonate, Na₂CO₃.