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Holt Physical Science Chapter 6: Chemical 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. Which formula determines the final energy of a reaction?

Question 2 2. Suppose you were teaching a science class to middle school students. Because you want to show them an impressive chemical reaction, you decide to dissolve zinc in hydrochloric acid. You add more acid than usual and throw in pieces of zinc. What factor is not going to impact the reaction rate?

Question 3 3. What is chemical equilibrium?

Question 4 4. Which of the following equations is exothermic?

Question 5 5. For a 150 g sample of glucose, there is 60 g of carbon. How many grams of carbon are there for a 300 g sample glucose? The formula for glucose is:

Page 2

Question 6 6. What do the brackets indicate in an equilibrium equation?

Question 7 7. How is reaction rate measured?

Question 8 8. When a bond forms, energy is given off to the surroundings. This is an example of

Question 9 9. What will be the result if heat is added to an endothermic reaction?

Question 10 10. There is a total of 200 g of propane left in a tank. How much carbon in grams, is in 200 g of propane? Propane has the formula:

Page 3

Question 11 11. An endothermic reaction is:

Question 12 12.

Choose the correctly balanced equation for the following reaction:

Potassium + water → potassium hydroxide + hydrogen gas

Question 13 13. Chemical energy is a specific type of _____.

Question 14 14. Why is a teeter-totter a good illustration of an equilibrium adjustment between two gas volumes?

Question 15 15. Given the following information, for the reaction between Al and Fe2 O3 , what is the correct final reaction?

Page 4

Question 16 16. What is a coefficient?

Question 17 17. What will happen if a chemical reaction system is stressed by an increase in the concentration of reactants?

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

Question 19 19. How much oxygen does the following compound contain?

Question 20 20. Select the equation that represents the energy transformation when a chemical bond is broken.

Page 5

Question 21 21. What makes the statement 'the presence of a catalyst will slow down a reaction' incorrect?

Question 22 22. What type of double displacement reaction is this?

Question 23 23. An example of an exothermic reaction is:

Question 24 24. Which of the following is a non useable energy?

Question 25 25. If you wanted to decrease the rate of reaction, what action would you need to take?

Page 6

Question 26 26. What does it mean when the enthalpy change for a reaction is negative?

Question 27 27.

Choose the correctly balanced equation for the following reaction:

Sodium + water → sodium hydroxide + hydrogen gas

Question 28 28. Fill in the blank: The total number of atoms before a reaction happens is _____ the total number of atoms after a reaction happens.

Question 29 29. Enthalpy change is

Question 30 30. Which of the following equations is balanced?

Holt Physical Science Chapter 6: Chemical 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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