TExES Science 7-12: Chemical Equations & 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!

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Question 1 1. 3.9g of potassium reacts with water to produce potassium hydroxide and hydrogen gas. Calculate the mass of potassium hydroxide produced.

Question 2 2. What is NOT a step in determining the formula of a hydrate?

Question 3 3. What is the rate law?

Question 4 4. Select the most suitable definition for stoichiometry.

Question 5 5. Say you take a reactant A and calculate the amount of moles of another reactant B required to use up all of A. How do you know which of two reactants is the limiting one?

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Question 6 6. In order for a chemical reaction to take place, what must occur?

Question 7 7.

Choose the correctly balanced equation for the following reaction:

Potassium + water → potassium hydroxide + hydrogen gas

Question 8 8. When metals and non-metals other than oxygen react, what is formed?

Question 9 9. What is a limiting reactant?

Question 10 10. What is the percent composition of Cu₂S?

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Question 11 11.

If you get an equilibrium constant of less than 1 for the chemical reaction below, what does that tell you?

sodium + chlorine --> sodium chloride

Question 12 12. If a scientist is trying to determine the reaction order for a given reaction, then what's the most effective means to figure it out?

Question 13 13. At STP, how much space (in liters) will 0.750 moles of argon gas occupy?

Question 14 14. Choose the BEST answer that finishes this statement about the collision theory: the speed of chemical reactions is related to:

Question 15 15. What is a catalyst?

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Question 16 16. What is the rate-determining step?

Question 17 17. What does Kf/Kr tell you?

Question 18 18. How do you determine the amount of product made?

Question 19 19.

For the following reaction, which substance(s) is (are) the reactant(s)?

sodium + chlorine --> sodium chloride

Question 20 20. What is theoretical yield?

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Question 21 21. What is an activated complex?

Question 22 22. In the reaction A = B, if the rate quadruples for every doubling of A, then what is the reaction order?

Question 23 23. When two non-metals react, what do they form?

Question 24 24. What is the actual yield?

Question 25 25. 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?

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Question 26 26. If a scientist induces a chemical reaction, and finds that the reactants and products exist in a single phase, then what did the scientist observe?

Question 27 27. If a chemical reaction has an activation energy of 500 J, and its reactants are assembled with 250 J of energy, what will happen? Why?

Question 28 28. The starting point of a stoichiometric problem is _____.

Question 29 29. Which of the following statements is true about the reaction rate constants?

Question 30 30. What is a reaction mechanism?

TExES Science 7-12: Chemical Equations & 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!

TExES Science 7-12 (236): Practice & Study Guide  /  Science Courses
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