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Transcript
Name: _____________________________ Date: _________________ Per: _____ Chemistry Quiz #3-6: Nuclear Chemistry PRACTICE For each of the following questions or statements, select the most appropriate response and write its letter on the answer line: _____ 1. What is the change in the atomic number when an atom emits an alpha particle? A. decreases by 2 B. decreases by 1 C. remains the same D. increases by 1 E. increases by 2 _____ 2. What is the change in atomic number when an atom emits a beta particle? A. decreases by 2 B. decreases by 1 C. stays the same D. increases by 1 E. increases by 2 _____ 3. What particle is emitted in alpha radiation? A. electron B. helium nucleus C. hydrogen nucleus D. photon E. positron _____ 4. What thickness of what material is the minimum necessary to stop a beta particle? A. three feet of concrete B. three inches of lead C. sheet of aluminum foil D. sheet of paper E. beta particles cannot be stopped _____ 5. What does gamma radiation consist of? A. electrons B. gamma particles C. helium nuclei D. hydrogen nuclei E. photons _____ 6. What particle does argon-39 lose when it decays to potassium-39? A. alpha particle B. electron C. neutron D. positron E. proton _____ 7. What particle is needed to complete this nuclear reaction? A. B. C. D. E. _____ 8. What particle is needed to complete this nuclear reaction? A. B. C. D. E. _____ 9. An unstable nucleus: A. may have too many neutrons B. may have too few neutrons C. may turn into a new element D. loses energy by emitting radiation E. all of the above _____ 10. A piece of wood found in an ancient burial mound contains only half as much carbon-14 as a piece of wood cut from a living tree growing nearby. If the half-life (t1/2) for carbon-14 is 5730 years, what is the approximate age of the ancient wood? A. 730 years B. 1460 years C. 2856 years D. 5730 years E. 11460 years Answers: 1. A 2. D 3. B 4. C 5. E 6. B 7. A 8. D 9. E 10. D