Chemical Changes & Reactions 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. Oxidation describes the process of:

Question 2 2. Identify which general equation is a combination reaction.

Question 3 3. Why is it beneficial to use a logarithmic scale to measure pH?

Question 4 4. Which of the following mole ratio is NOT appropriate to the equation 6CO2+ 6H2 O = C6 H12 O6+ 6O2?

Question 5 5. 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?

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Question 6 6. 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?

Question 7 7. How is a mole ratio used?

Question 8 8.

What products would you expect from a reaction between HCl and KOH?

I. KCl

II. H2O

III. KH

Question 9 9. How many moles of Na are needed to produce 15 moles of NaCl in the reaction 2Na + Cl2 = 2NaCl?

Question 10 10. Compound X is converted to elements A and B. Compound X has undergone a _____ reaction.

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Question 11 11. Which of the following is a double-replacement reaction?

Question 12 12. When a bond forms, energy is given off to the surroundings. This is an example of

Question 13 13. The pH scale is a way of measuring _______.

Question 14 14. Enthalpy change is

Question 15 15. What does it mean when the enthalpy change for a reaction is negative?

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Question 16 16. Maria is conducting an experiment, and creates a substance that seems to be a proton acceptor as well as a proton donor. Which of the following would be the BEST for Maria to use in order to define what type of substance she has created?

Question 17 17. Which type of reaction always requires oxygen to be a reactant?

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

Question 19 19. A lab technician dissolved 2 mol of X in 1 liter of water in order to make a 2 M solution. What did they do wrong?

Question 20 20. What molecule in our bodies is a catalyst?

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Question 21 21. In the following chemical equation, what is the reducing agent?

Question 22 22. An endothermic reaction is:

Question 23 23. Select the most suitable definition for stoichiometry.

Question 24 24. The reactant in a redox reaction that readily donates electrons is called a/an:

Question 25 25. A reaction that occurs spontaneously is called what?

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Question 26 26. Which of the following best describes a reactant?

Question 27 27. Donna noticed that as she was creating a solution, an acid was formed when a base gained a proton. Which of the following is Donna noticing?

Question 28 28. What is an activated complex?

Question 29 29. If we know that manganese dioxide is a catalyst in the decomposition of hydrogen peroxide, then how does manganese dioxide affect this reaction?

Question 30 30. Which of the following correctly identifies the reactants for the reaction given below.

Chemical Changes & Reactions 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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