CHEM 162 FINAL WXAM QUESTIONS AND ANSWERS, LATEST UPDATED 2024/2025 (GRADED)

Which one of the following nuclear reactions is not correct? A. 226 88Ra → 222 86Ra + α B. 63 28Ni → 63 29Cu + βC. 11 C → 11 B + β+ D. 14 C → 14 N + βE. 14 7N + 1 0n → 14 C + 1 1p A. Correct. 22688Ra → 22286Ra + 4 α B. Correct. 6328Ni → 6329Cu + 0 -1e C. Not correct. 11 C → 11 B + 0 e 3 6 7 -1 6 D. Correct. 14 C → 14 N + 0 e E. Correct. 147N + 1 0n → 14 C + 1 1p CHEM 162-2009 FINAL EXAM CHAPTER 19 - THE NUCLEUS RADIOACTIVE DECAY PARTICLES AND RAYS 24. The isotope 5929Cuc is unstable. This is predictable because (Note: “Cuc” is probably a typo of “Cu”.) A. the number of neutrons is too large in relation to the number of protons. B. the atomic number is too large. C. the mass number is too large. D. Sc isotopes are all unstable. 4 2 2 E. the number of neutrons is too small in relation to the number of protons. Generally, a stable isotope is one which has a ratio of neutrons to protons of between 1:1 and 1.5:1. This atom has a ratio of neutrons to protons of 30:29, which is 1.03:1, so it should be stable. A closer look at the rules shows that only the smallest atoms have a neutron to proton ratio of 1:1, so possibly Cu should be closer to 1.5:1 for stability. From the periodic table: Cu containing 29 protons and 35 neutrons appears to be stable. Therefore, this atom seems to need more neutrons or less protons. The number of neutrons is too small in relation to the number of protons. E CHEM 162-2009 FINAL EXAM CHAPTER 19 - THE NUCLEUS RADIOACTIVE DECAY PARTICLES AND RAYS 43. When the Pd-106 nucleus is struck with an alpha particle, a proton is produced along with a new element. What is this new element? A. Ag-109 B. Cd-112 C. Cd-109 D. Ag-108 E. Ag-110 106 46Pd + 4 He → 1 1H + 109 47? 106 46Pd + 4 He → 1 1H + 109 47Ag 5 Ag-109 A 6 45 Chem 162-2008 Final Exam + Answers Chapter 19 – Nuclear Chemistry Radioactive decay particles and rays Which statement is not true? A. Gamma-ray emission results in no change in mass number. B. Alpha (