Pretest

1. Pretest Chapter 10 1. According to the law of conservation of mass, if element X has a molar mass of 3 g/mol, and element Y has a molar mass of 5 g/mol, what must be the total mass of products formed when one mole of the compound X2Y decomposes? 2. True or False: A reaction rate is the rate at which reactants change into products over time. 3. If you tossed 128 coins in the air, about how many could you expect to land heads up?

2. Pretest (continued) Chapter 10 4. Suppose you were to remove any coins that landed heads up, and then toss the remaining coins in the air. How many times could you expect to repeat this process until you had removed all of the coins? 5. The element uranium belongs to a. Group 7A (halogens). b. Group 8A (noble gases). c. the lanthanide series.d. the actinide series. 6. Which subatomic particles are found in the nucleus of an atom?

3. Interest Grabber Section 10.1 Modeling Beta Decay Cut out a strip of blue paper and a strip of red paper. Cut each strip of paper into 10 squares. Use the red squares to represent protons, and the blue squares to represent neutrons. 1. Arrange the correct number of each type of square on your desk in order to model a carbon-14 nucleus. How many of each type of square did you use in your model? 2. Switch out one blue square in your nuclear model with one red square so that the nucleus contains the same total number of subatomic particles. What isotope does your model now represent? 3. When a carbon-14 nucleus undergoes the change you have modeled, an electron is emitted. What is the nuclear charge of carbon-14? How does this compare to the sum of the charge of an electron and the nuclear charge of the new isotope formed?

4. Reading Strategy Section 10.1 Previewing • a. Nuclear decay is the spontaneous change of one isotope into another. • What are the types of nuclear radiation? c. What are the effects of nuclear radiation? d. One effect of nuclear radiation is the ionization of matter. e. How can nuclear radiation be detected? f. Nuclear radiation can be detected by a Geiger counter or film badge.

5. Penetrating Powers of Nuclear Radiation Figure 4

6. Penetrating Powers of Nuclear Radiation Figure 4

7. Penetrating Powers of Nuclear Radiation Figure 4

8. Penetrating Powers of Nuclear Radiation Figure 4

9. Balancing Nuclear Equations Section 10.1

10. Balancing Nuclear Equations Section 10.1

11. Balancing Nuclear Equations Section 10.1

12. Balancing Nuclear Equations Section 10.1

13. How Radon Gas Enters a Building Figure 4

14. How Radon Gas Enters a Building Figure 4

15. How Radon Gas Enters a Building Figure 4

16. How Radon Gas Enters a Building Figure 4

17. Interest Grabber Section 10.2 Analogy for Half-Life The diagrams below represent the charge level of a battery in a robotic dog at different times during the day. You charged the battery so that it was at its highest level at 9:00 A.M. Examine the diagrams, and then answer the questions that follow.

18. Interest Grabber Section 10.2 1.The dog uses half of any remaining charge every 2 hours. So, if the battery is fully charged at 9:00 A.M., then the charge level will be at 11:00 A.M., two hours later. If it uses half of the remaining charge another two hours later, what will the energy level be at 1:00 P.M.? 2. Given the same trend, what time is it when the battery’s charge is at the level shown in the last diagram? 3.The battery must be recharged when its charge level reaches half of the level shown in the last diagram. What time will the battery need to be recharged?

19. Reading Strategy Section 10.2 Identifying Detail a. carbon-14 b. 50,000

20. Nuclear Decay of Iodine-131 Figure 7

21. Nuclear Decay of Iodine-131 Figure 7

22. Nuclear Decay of Iodine-131 Figure 7

23. Nuclear Decay of Iodine-131 Figure 7

24. Nuclear Decay of Iodine-131 Figure 7

25. Interest Grabber Section 10.3 Introduction to Transmutation Examine the diagram below that represents the nuclei of isotopes in a nuclear reaction, and answer the questions that follow. In the diagram, the light circles represent protons, and the dark circles represent neutrons. 1. What isotopes are represented by the starting nuclei? 2. What isotope is represented by the larger nucleus that is produced in the nuclear reaction? 3. What other particle is produced?

26. Reading Strategy Section 10.3 Monitoring Your Understanding Possible answers may include: a. Examples of artificial transmutation • Rutheford’s transmutation of nitrogen-14 into oxygen-17; the synthesis of neptunium-239 c. Uses of transuranium elements d. Smoke detectors (americium-241); space probes (plutonium-238)

27. Interest Grabber Section 10.4 Observing Attractive and Repulsive Forces 1. Arrange two bar magnets so that they stick together. Reverse the orientation of one of the magnets. Record your observations. 2. With a pencil, make 20 marks on an index card, each 1 mm apart. Place the magnets on the index card and orient them so that they repel one another. Gently tap them closer together until they will not move closer due to the repelling force. Using the pencil marks, record the distance between the two magnets. 3. Place the magnets on the index card and orient them so that they attract one another. Gently tap them closer together until they snap together on their own. Using the pencil marks, record the distance between the two magnets at the point just before they snap together.

28. Reading Strategy Section 10.4 Comparing and Contrasting a. is the splitting of a large nucleus into two smaller fragments b. is widely used as an alternative energy source c. is the fusing of two small nuclei into one larger nucleus d. is still being researched and developed as an alternativeenergy source

29. Comparing Strong Nuclear Forces and Electrical Forces Figure 15

30. Comparing Strong Nuclear Forces and Electrical Forces Figure 15

31. Comparing Strong Nuclear Forces and Electrical Forces Figure 15

32. Comparing Strong Nuclear Forces and Electrical Forces Figure 15

33. Effect of Nuclear Size on Nuclear and Electrical Forces Figure 16

34. Effect of Nuclear Size on Nuclear and Electrical Forces Figure 16

35. Effect of Nuclear Size on Nuclear and Electrical Forces Figure 16

36. Effect of Nuclear Size on Nuclear and Electrical Forces Figure 16

37. Nuclear Fission of Uranium-235 Figure 18

38. Nuclear Fission of Uranium-235 Figure 18

39. Nuclear Fission of Uranium-235 Figure 18

40. Nuclear Fission of Uranium-235 Figure 18

41. Chain Reaction of Uranium-235 Figure 19

42. Chain Reaction of Uranium-235 Figure 19

43. Chain Reaction of Uranium-235 Figure 19

44. Chain Reaction of Uranium-235 Figure 19

45. Chain Reaction of Uranium-235 Figure 19

46. Chain Reaction of Uranium-235 Figure 19

47. Chain Reaction of Uranium-235 Figure 19

48. Chain Reaction of Uranium-235 Figure 19

49. Chain Reaction of Uranium-235 Figure 19

50. Pretest Answers Chapter 10 1. According to the law of conservation of mass, if element X has a molar mass of 3 g/mol, and element Y has a molar mass of 5 g/mol, what must be the total mass of products formed when one mole of the compound X2Y decomposes? 2. True or False: A reaction rate is the rate at which reactants change into products over time. 3. If you tossed 128 coins in the air, about how many could you expect to land heads up? 11 g about 64 coins Click the mouse button to display the answers.