Chhmwk11 - moore (jwm2685) Homework 11 vanden bout (51640)...

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Unformatted text preview: moore (jwm2685) Homework 11 vanden bout (51640) 1 This print-out should have 46 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. Question 8 has a typo. The reaction should read Iron-58 (Fe-58) instead of fluorine-58 (F- 58), which does not exist. 001 10.0 points What is the neutron : proton ratio for the nucleus 16 8 O, and determine where does it lie in relation to the band of stability? 1. 1 : 2, outside 2. 2 : 1, outside 3. 1 : 1, outside 4. None of these 5. 1 : 2, within 6. 2 : 1, within 7. 1 : 1, within correct 8. 3 : 1, outside 9. 3 : 1, within Explanation: 16 8 O = 8 protons, 8 neutrons Ratio = 8 8 = 1 : 1 16 8 O lies within the band of stability. 002 10.0 points What is the neutron : proton ratio for the nucleus 156 60 Nd, and where does it lie in relation to the band of stability? 1. None of these 2. 1.6 : 1, outside correct 3. 1 : 2, outside 4. 1 : 1, within 5. 1 : 2, within 6. 1.6 : 1, within 7. 2 : 1, outside 8. 2 : 1, within 9. 1 : 1, outside Explanation: 156 60 Nd = 60 protons, 96 neutrons Ratio = 96 60 = 1 . 6 : 1 156 60 Nd lies outside the band of stability. 003 10.0 points What species carries a negative charge? 1. particle 2. particle correct 3. rays 4. protons Explanation: A particle is akin to an electron, including the 1- charge. 004 10.0 points What is the MOST massive particle? 1. particle correct 2. electron 3. neutron 4. proton Explanation: An alpha particle is akin to a helium atom. Of those listed, it is the heaviest. 005 10.0 points What is the neutron : proton ratio for the nucleus 206 82 Pb? moore (jwm2685) Homework 11 vanden bout (51640) 2 1. 2 : 1 2. None of these 3. 0.51 : 1 4. 1 : 2.51 5. 1.51 : 1 correct 6. 2.51 : 1 Explanation: 206 82 Pb = 82 protons, 124 neutrons Ratio = 124 82 = 1 . 51 : 1 006 10.0 points The binding energy of a nucleus is 1. related to the number of electrons in a nucleus. 2. related to the mass lost in a chemical reaction. 3. the energy evolved when a nucleus breaks up into fundamental particles. 4. the energy required to eject one neutron from the nucleus. 5. the energy released when Z protons and A- Z neutrons come together to form a nucleus. correct Explanation: 007 10.0 points The nuclear binding energy for lithium-7 is the energy released in the nuclear reaction 1. 3 1 H + 7 n 7 Li 2. 3 1 H + 4 n 7 Li correct 3. 7 1 H 7 Li 4. 3 1 H + 4 7 Li 5. 6 Li + n 7 Li Explanation: 008 10.0 points Calculate the energy change for the synthesis of 1 mol 60 Co: 58 F + 2 n 60 Co + 1. 2.53 10- 15 kJ 2. 8.43 10- 24 kJ 3. The calculation cannot be done without the mass of ....
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Chhmwk11 - moore (jwm2685) Homework 11 vanden bout (51640)...

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