AQA A-Level Chemistry: Practice and Study Guide  /  Science Courses

Test Prep Plan - Take a practice test

Take this practice test to check your existing knowledge of the course material. We'll review your answers and create a Test Prep Plan for you based on your results.
How Test Prep Plans work
1
Answer 50 questions
Test your existing knowledge.
2
View your test results
Based on your results, we'll create a customized Test Prep Plan just for you!
3
Study smarter
Study more effectively: skip concepts you already know and focus on what you still need to learn.

AQA A-Level Chemistry: Amount of Substance Chapter Exam

Exam Instructions:

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

Page 1

Question 1 1. What is the empirical formula of a compound containing (by mass) 36.5% sulfur and 63.5% iron?

Question 2 2. What is the percent composition of H₂SO₃?

Question 3 3. What is molarity?

Question 4 4. How many moles of solute are in a 0.50 L solution of 3.0 molarity?

Question 5 5. What is the molarity of a solution made by dissolving 26.42 g of (NH4) 2 SO4 in enough water to make 50 mL of solution?

Page 2

Question 6 6. The starting point of a stoichiometric problem is _____.

Question 7 7. Which of the following best describes this molecular formula 3H2O? (Note the 2 after the hydrogen atom is subscripted)

Question 8 8. Which of the following variables is NOT included in the ideal gas equation?

Question 9 9. What does the empirical formula show?

Question 10 10. A lab technician has 2 mol of X in an Erlenmeyer flask and pours in 1 liter of water in order to make a 2 M solution. Why is the solution not exactly 2 M?

Page 3

Question 11 11. What is a coefficient?

Question 12 12. Standard temperature and standard pressure refer to:

Question 13 13. What is the percent composition of Cu₂S?

Question 14 14. You conduct an experiment that requires the creation of an ammonia solution. You do this by reacting 50.0 L of nitrogen gas with excess hydrogen gas at STP to create ammonia gas using the Haber process given by the following reaction: N2 (g) + 3H2 (g) → 2NH3 (g). Assuming the reaction had 100% yield, you then bubble the ammonia into 5.0 L of water. What is the molarity of the resulting ammonia solution?

Question 15 15. Which of the following calculations is NOT part of determining the empirical formula?

Page 4

Question 16 16. Determine the percent yield if the theoretical yield is 20 g and the actual yield is 15 g.

Question 17 17. How many moles of Na are needed to produce 15 moles of NaCl in the reaction 2Na + Cl2 → 2NaCl?

Question 18 18. When is molality usually used?

Question 19 19. Which of the following mole ratio is NOT appropriate to the equation 6CO2+ 6H2 O → C6 H12 O6+ 6O2?

Question 20 20. A tenth of a mole of pennies contains how many pennies?

Page 5

Question 21 21. What is theoretical yield?

Question 22 22. Where do you look to find the molar ratio?

Question 23 23. Which of the following is a true statement?

Question 24 24. At STP, how much space (in liters) will 0.750 moles of argon gas occupy?

Question 25 25. Avogadro's law shows the relationship between _____.

Page 6

Question 26 26. Which of the following best describes this molecular formula H2O? (Note the 2 is subscripted)

Question 27 27. An expandable container is holding 0.75 moles of argon with a volume of 5.0 L. Assuming the temperature and pressure are held constant, how many moles of argon would be needed to increase the volume to 7.0 L?

Question 28 28. Given a balanced equation involving A and B, which set of conversions must you make to change mass A to mass B?

Question 29 29. How many grams of CH3 OH is needed to make a 0.244 M solution in 400 mL of water?

Question 30 30. What is meant by the term molar volume?

AQA A-Level Chemistry: Amount of Substance Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

Support