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Exam 4-solutions - Version 235 Exam 4 vanden bout(51640...

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Version 235 – Exam 4 – vanden bout – (51640) 1 This print-out should have 31 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points CH 3 CH CH 3 OH How many chiral centers does this molecule have? 1. 2 2. 4 3. 3 4. 1 correct 5. 0 Explanation: There is only one carbon center as only the carbon bonded to the hydroxyl group have Four di±erent groups bonded to it. All the car- bons in the phenyl ring have only three bonds. The other two carbons are both methyl groups with three hydrogens. 002 10.0 points The mass oF a 7 3 Li atom is 7.016 amu. Given that the mass oF an electron is 0.00055 amu, the mass oF a neutron is 1.0087 amu, and the mass oF a proton is 1.0073 amu, calculate the binding energy oF a 7 3 Li nucleus. 1. 1.1 x 10 - 10 J 2. 6.30 x 10 - 12 J correct 3. 1.1 x 10 11 J 4. 1.89 x 10 - 11 J 5. 4.8 x 10 - 11 J 6. 2.6 x 10 13 J 7. 4.8 x 10 12 J Explanation: The mass deFect is 0.04213 amu which is 7.00 x 10 - 29 kg Using E = mc 2 this gives 6.29 x 10 - 12 J 003 10.0 points Gamma radiation is typically considered the most dangerous Form oF radiation because 1. it is the only Form oF radiation that can a±ect organic molecules 2. it typically generates Further nuclear de- cay 3. it can penetrate most substances and thereFore is very di²cult to shield against correct 4. it is the only Form oF ionizing radiation 5. it is not actually considered to be very dangerous when compared to other Forms oF radiation Explanation: Gamma rays are high energy EM waves that can penetrate through almost any sub- stance. The danger does come From ionization but alpha and beta radiation are also ionizing radiation. 004 10.0 points Consider the compound C C C C C C C C Which skeleton below is a structural isomer oF this compound? 1. C C C C C C C
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Version 235 – Exam 4 – vanden bout – (51640) 2 2. C C C C C C C 3. C C C C C C C C correct 4. C C C C C C C Explanation: Structural isomer has the some number of atom of each element but a merged in a dig- gernt manner. 005 10.0 points Ar-37 undergoes electron capture. What is the product? 1. 36 18 Ar 2. 38 18 Ar 3. 37 19 K 4. 37 17 Cl correct 5. None of these Explanation: 006 10.0 points Most forms of nuclear decay lead to the emis- sion of gamma rays because 1. they generate nuclei in excited states that subsequently decay by emission of gamma rays. correct 2. they generate beta particles which ionize other atoms leading to the emission of gamma rays. 3.
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Exam 4-solutions - Version 235 Exam 4 vanden bout(51640...

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