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CSET Science Subtest II Chemistry (218): Practice & Study Guide  /  Science Courses

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Conservation of Matter & Stoichiometry 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. How many moles of solute are in a 0.50 L solution of 3.0 molarity?

Question 2 2. At STP, how much space (in liters) will 0.750 moles of argon gas occupy?

Question 3 3. What is meant by the term molar volume?

Question 4 4. The substance that is reduced in a reaction is also called _____.

Question 5 5. In redox reactions, how are oxygen atoms generally balanced?

Page 2

Question 6 6. Identify the element which is the strongest reducing agent.

Question 7 7. What is the oxidation number for each atom in NH4+?

Question 8 8. What are the oxidation numbers of the atoms in the compound CF4?

Question 9 9. The oxidation numbers of H and K in KH are respectively _____ and _____.

Question 10 10. What is a coefficient?

Page 3

Question 11 11. Which of the following equations is balanced?

Question 12 12.

Choose the correctly balanced equation for the following reaction:

Sodium + water → sodium hydroxide + hydrogen gas

Question 13 13. What is an excess reactant?

Question 14 14. What is a limiting reactant?

Question 15 15. If 2.5 moles of zinc react with 6.0 moles of hydrochloric acid in the equation Zn + 2HCl = ZnCl2 + H2, what is the limiting reactant?

Page 4

Question 16 16. If we need 0.75 moles of ammonium hydroxide, how much is this in grams? The molar mass of ammonium hydroxide is 35.04 g/mol

Question 17 17. If we have 2 moles of sodium phosphate , what is its amount in grams? The molar mass of sodium phosphate is 163.94 g/mol.

Question 18 18. What is the molar mass of glucose C6H12O6?

Question 19 19. Using the following information determine the molecular weight of sodium hydroxide:

Question 20 20. How much sodium bromide (NaBr) (in grams) is needed in order to make 2 moles of sodium chloride (NaCl)?

Page 5

Question 21 21. What is the atomic weight of silver as shown in the block below?

Question 22 22. Given a balanced equation involving A and B, which set of conversions must you make to change mass A to mass B?

Question 23 23. The starting point of a stoichiometric problem is _____.

Question 24 24. How is mass of a substance connected to its amount in mole(s)?

Question 25 25. How is a mole ratio used?

Page 6

Question 26 26. Which of the following mole ratio is NOT appropriate to the equation 6CO2+ 6H2 O → C6 H12 O6+ 6O2?

Question 27 27. How many moles of N2 are needed to produce 18 moles NH3 in the reaction N2 + 3H2 → 2NH3?

Question 28 28. What is the actual yield?

Question 29 29. Determine the actual yield if the theoretical yield is 12 g and the percentage yield is 90%.

Question 30 30. How is percent yield calculated?

Conservation of Matter & Stoichiometry 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!

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