TExMaT Master Science Teacher 8-12: Chemical Reactions Basics 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!

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Question 1 1. What does the empirical formula show?

Question 2 2. What is the actual yield?

Question 3 3. Where do you look to find the molar ratio?

Question 4 4. What is the percent composition of H₂SO₃?

Question 5 5. Enthalpy change is

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Question 6 6. If there are three moles of H2 O for every one mole of LiClO4, then what is the hydrate formula?

Question 7 7. 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?

Question 8 8. How is percent yield calculated?

Question 9 9. How many moles of N2 are needed to produce 18 moles NH3 in the reaction N2 + 3H2 = 2NH3?

Question 10 10. Determine the actual yield if the theoretical yield is 12 g and the percentage yield is 90%.

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Question 11 11. 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 12 12. Given a balanced equation involving A and B, which set of conversions must you make to change mass A to mass B?

Question 13 13. What does it mean when the enthalpy change for a reaction is negative?

Question 14 14. Which of the following equations is balanced?

Question 15 15. The starting point of a stoichiometric problem is _____.

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Question 16 16. What is a coefficient?

Question 17 17. What is the empirical formula of a compound containing (by mass) 36.5% sulfur and 63.5% iron?

Question 18 18. What is a limiting reactant?

Question 19 19. How is mass of a substance connected to its amount in mole(s)?

Question 20 20. In the formula MgSO4 nH2 O, what does the n before the H2 O stand for?

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Question 21 21. An endothermic reaction is:

Question 22 22.

Choose the correctly balanced equation for the following reaction:

Potassium + water → potassium hydroxide + hydrogen gas

Question 23 23. If 1.605 kg of mercury are used in the reaction 2Hg + O2 --> 2HgO, what is the mass of HgO, in kilograms, that are produced?

Question 24 24. How do you determine the amount of product made?

Question 25 25. How many moles of solute are in a 0.50 L solution of 3.0 molarity?

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Question 26 26. How many moles of Na are needed to produce 15 moles of NaCl in the reaction 2Na + Cl2 = 2NaCl?

Question 27 27. What is the difference between a hydrate and an anhydrate?

Question 28 28. What is meant by the term molar volume?

Question 29 29. Which of the following calculations is NOT needed to determine the empirical formula?

Question 30 30.

Choose the correctly balanced equation for the following reaction:

Sodium + water → sodium hydroxide + hydrogen gas

TExMaT Master Science Teacher 8-12: Chemical Reactions Basics 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!

TExMaT Master Science Teacher 8-12 (092): Practice & Study Guide  /  Science Courses
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