1. To return to the chapter summary click Escape or close this document. glencoe.com Image Bank Foldables Video Clips and Animations Standardized Test Practice Chapter Resources Click on one of the following icons to go to that resource. Chapter Review Questions Chapter Summary

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3. To return to the chapter summary click Escape or close this document. Image Bank Click on individual thumbnail images to view larger versions.

4. To return to the chapter summary click Escape or close this document. Image Bank To transfer images to your own power point follow the following steps: Open the “Resource” file from the CD-ROM disc – view the file in the “normal view” or “slide sorter view” mode - go to slide #2 – from there you can click through the images and follow these instructions. Click once on the image. Copy the image Go to your own power point document Paste the image. Transfer Images

5. To return to the chapter summary click Escape or close this document. Image Bank Rusted Boat

6. To return to the chapter summary click Escape or close this document. Image Bank Reactions Table

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8. To return to the chapter summary click Escape or close this document. Image Bank Breaking Water into Components

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18. To return to the chapter summary click Escape or close this document. Foldables Chemical Reactions Make the following Foldable to help you understand chemical reactions.

19. To return to the chapter summary click Escape or close this document. Foldables Fold a vertical sheet of paper in half lengthwise

20. To return to the chapter summary click Escape or close this document. Foldables Cut along every third line of only the top layer to form tabs.

21. To return to the chapter summary click Escape or close this document. Foldables Label each tab.

22. To return to the chapter summary click Escape or close this document. Foldables Before you read the chapter, write several questions you have about chemical reactions on the front of the tabs. As you read, add more questions. Under the tabs of your Foldable, write answers to the questions you recorded on the tabs. Research Information

23. To return to the chapter summary click Escape or close this document. Video Clips Click image to view movie.

24. To return to the chapter summary click Escape or close this document. 1 1 Reviewing Main Ideas Chemical reactions often cause observable changes, such as change in color or odor, a release or absorption of heat or light, or a release of gas. Formulas and Chemical Equations A chemical equation is a shorthand method of writing what happens in a chemical reaction. Chemical equations use symbols to represent the reactants and products of a reaction, and sometimes show whether energy is produced or absorbed.

25. To return to the chapter summary click Escape or close this document. 1 1 Reviewing Main Ideas The law of conservation of mass requires that the same number of atoms of each element be in the products as in the reactants of a chemical equation. This is true in every balanced chemical equation. Formulas and Chemical Equations

26. To return to the chapter summary click Escape or close this document. 2 2 Reviewing Main Ideas The rate of reaction is a measure of how quickly a reaction occurs. Rates of Chemical Reactions All reactions have an activation energy—a certain minimum amount of energy required to start the reaction. The rate of a chemical reaction can be influenced by the temperature, the concentration of the reactants, and the exposed surface area of the reactant particles.

27. To return to the chapter summary click Escape or close this document. 2 2 Reviewing Main Ideas Catalysts can speed up a reaction without being used up. Inhibitors slow down the rate of reaction. Rates of Chemical Reactions Enzymes are protein molecules that act as catalysts in your body’s cells.

28. To return to the chapter summary click Escape or close this document. Question 1 Chapter Review There are catalysts inside your body—large protein molecules that help speed up reactions inside your cells and keep you alive. What are these catalysts called? A. enzymes B. inhibitors C. products D. reactants PS 3.3d

29. To return to the chapter summary click Escape or close this document. Answer Chapter Review The answer is A.

30. To return to the chapter summary click Escape or close this document. Question 2 Chapter Review Many packaged foods you buy at the grocery store include some kind of preservative that keeps the contents fresh longer. Even without knowing what the exact preservative is, you would assume that it is some kind of _______. PS 3.3d

31. To return to the chapter summary click Escape or close this document. Answer Chapter Review The answer is inhibitor. The spoiling process is, in fact, a chemical reaction. The presence of an inhibitor will decrease that reaction rate and increase shelf life.

32. To return to the chapter summary click Escape or close this document. Question 3 Chapter Review Many kinds of food need to be refrigerated in order to keep them from spoiling. Knowing what you now know about chemistry, can you explain why this is so? PS 3.3b

33. To return to the chapter summary click Escape or close this document. Answer Chapter Review A decrease in temperature decreases reaction rates. Since spoilage is a chemical reaction, refrigeration of perishable food will slow down its tendency to spoil.

34. To return to the chapter summary click Escape or close this document. Question 4 Chapter Review According to the law of the conservation of mass, the mass of the _______ must be the same as the mass of the _______. PS 3.2e

35. To return to the chapter summary click Escape or close this document. Answer Chapter Review The mass of the products must be the same as the mass of the reactants.

36. To return to the chapter summary click Escape or close this document. Question 5 Chapter Review Endothermic reactions _______ heat energy. Answer Endothermic reactions absorb heat energy. PS 4.3

37. To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 1 A greater surface area results in a(n)_______ reaction rate. A. decreased B. increased C. unchanged D. visible PS 3.2c

38. To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is B. This is why breaking up a big log into smaller pieces makes it more likely to burn. A pile of smaller pieces has much more surface area than one big log.

39. To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 2 Burning is an _______ chemical reaction. A. endothermic B. exothermic C. exoskeletal D. existential PS 3.2c

40. To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is B. Since heat is released the chemical reaction causing it must be exothermic.

41. To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 3 Rusting is an example of an _______ chemical reaction. A. endothermic B. exothermic C. endogenous D. exogamous PS 3.2c

42. To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is B. You cannot sense the heat being released when iron rusts because of the slow reaction rate. Still, it is an exothermic chemical reaction.

43. To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 4 In reactions that absorb energy, the reactants are _______. A. less stable B. more stable C. perfected D. unstable PS 4.3

44. To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is B. The reactants are more stable and their bonds have less energy than the bonds of their products.

45. To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 5 Even if it isn’t written into a chemical equation, _______ is always part of any chemical reaction. A. energy B. sound C. tonality D. vibration PS 4.3a

46. To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is A. Energy may be needed to start the reaction or it may be given off as a result of the reaction, but it is always involved.

47. To return to the chapter summary click Escape or close this document. To advance to the next item or next page click on any of the following keys: mouse, space bar, enter, down or forward arrow. Click on this icon to return to the table of contents Click on this icon to return to the previous slide Click on this icon to move to the next slide Click on this icon to open the resources file. Help Click on this icon to go to the end of the presentation.

48. To return to the chapter summary click Escape or close this document. End of Chapter Resources File