Physical Science Guided Reading and Study Workbook Chapter 7

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Chapter 7 Chemical Reactions Section 7.4 Reaction Guided 7 Chemical Reactions Section 7.4 Reaction...

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Name ___________________________ Class ___________________ Date _____________

Chapter 7 Chemical Reactions

Section 7.4 Reaction Rates(pages 212215)This section discusses the factors that affect reaction rates.

Reading Strategy (page 212)Building Vocabulary As you read, complete the web diagram belowwith key terms from this section. For more information on thisReading Strategy, see the Reading and Study Skills in the Skills andReference Handbook at the end of your textbook.

Reactions Over Time (page 212)1. Any change that happens over time can be expressed as a(n)

.2. What is a reaction rate?

Factors Affecting Reaction Rates (pages 213215)3. Is the following sentence true or false? One way to observe the rate

of a reaction is to observe how fast products are being formed.

4. Is the following sentence true or false? The rate of any reaction is aconstant that does not change when the reaction conditions change.

5. Generally, an increase in temperature will the reaction rate.

6. Is the following sentence true or false? Storing milk in a refrigeratorstops the reactions that would cause the milk to spoil.

7. How does an increase in surface area affect the exposure of reactants to oneanother?

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Physical Science Guided Reading and Study Workbook Chapter 7 59

Factors affecting reaction rates
8. Why does increasing the surface area of a reactant tend to increase the reaction rate?

9. Stirring the reactants in a reaction mixture will generallythe reaction rate.

10. Is the following sentence true or false? Increasing theconcentration of the reactants will generally slow down a chemicalreaction.

11. Is the following sentence true or false? A piece of material dippedin a concentrated dye solution will change color more quickly thanin a dilute dye solution.

12. Why does an increase in pressure speed up the rate of a reaction involving gases?

13. What is a catalyst?

14. Circle the letters of the sentences that correctly identify whychemists use catalysts. a. to speed up a reactionb. to enable a reaction to occur at a higher temperaturec. to slow down a reactiond. to enable a reaction to occur at a lower temperature

15. Is the following sentence true or false? Because a catalyst is quicklyconsumed in a reaction, it must be added to the reaction mixtureover and over again to keep the reaction going.

16. Identify where the catalyst V2O5 should go in the formula shownand write it in the correct location.

2SO2 O2 h 2SO3

17. Circle the letter of the correct answer. In the reaction representedby the equation 2H2O2 h 2H2O + O2, which substance acts as acatalyst?a. H2O2 b. Ptc. H2O d. O2

18. One way that a catalyst can lower the energy barrier of a reaction is by providing a surface on which the can come together.

Name ___________________________ Class ___________________ Date _____________

Chapter 7 Chemical Reactions

Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.

60 Physical Science Guided Reading and Study Workbook Chapter 7

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