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Practice2ans - Practice Questions (with answers) Quiz #2...

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Practice Questions (with answers) Quiz #2 material 1. The proton potential energy has ___ component(s), it is/they are: a. one, strong force b. one, coulombic repulsion c. three, strong force, coulombic repulsion, gravity d. two, strong force, coulombic repulsion e. zero 2. Which type of radioactive decay has the net effect of changing a neutron into a proton? Which type of decay has the net effect of turning a proton into a neutron? a. β-particle, positron production b. positron production, β-particle c. gamma ray, β-particle d. gamma ray, electron capture e. β-particle, α-particle 3. The half-life of molybdenum-99 is 67.0 hours. How much of a 5 g sample of Mo 99 42 remains after 201 hours? a. 2.5 g b. 625 g c. 5 g d. 625 mg e. 312.5 mg
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4. What are W, X, Y, and Z in the following equations: Formation of a deuteron: W + n 1 0 b X Formation of a deuterium atom: P 1 1 + n 1 0 + Y b Z a. W = P 1 1 , X = d 2 1 , Y = e 0 1 , Z = H 2 1 (this one is actually ok as well, sorry) b. W = P 1 1 , X = D 2 1 , Y = e 0 1 , Z = d 2 1 c. W = e 0 1 , X = d 2 1 , Y = e 0 1 , Z = D 2 1 d. W = P 1 1 , X = D 2 1 , Y = e 0 1 , Z = d 2 1 e. W = P 1 1 , X = d 2 1 , Y = e 0 1 , Z = D 2 1 5. Phophorus-32 has a half-life of 14.3 days, how many moles are left from an original sample containing 0.5 moles after 35 days? a. 0.5 moles b. 0.92 moles c. 0.092 moles d. 0.377 moles e. 0.273 moles
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6. Krypton consists of several radioactive isotopes, some of which are listed in the following table: How long does it take for 93.75% of each of these isotopes to decay? Half-life Kr-73 27 sec Kr-74 11.5 min Kr-81 14.8 hr a. Kr-73 = 108 sec Kr-74 = 46 min Kr-81 = 59.2 hr b. Kr-73 = 81 sec Kr-74 = 34.5 min Kr-81 = 44.4 hr c. Kr-73 = 25.3 sec Kr-74 = 10.8 min Kr-81 = 13.9 hr d. Kr-73 = 135 sec Kr-74 = 57.5 min Kr-81 = 74 hr e. Kr-73 = 27 sec Kr-74 = 11.5 min Kr-81 = 14.8 hr
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7. A rock contains U 238 92 and Pb 206 82 . Analysis shows that the ratio of Pb 206 82 atoms to U 238 92 atoms was 0.3. Assuming no lead was originally present, that all of the lead formed over the years has remained in the rock, and that the number of nuclides in the intermediate stages of decay is negligible, calculate the age of the rock. The half- life of U 238 92 is 4.5 x 10 9 yr. a. 3.86 x 10 10 years b. 8.41 x 10 11 years c. 1.70 x 10 8 years d. 7.82 x 10 9 years e. 1.70 x 10 9 years 8. High energy particles from radioactive decay processes produce ions when they travel though matter. The probe of a ________ is filled with argon gas, which can be ionized by a rapidly moving particle. This allows a momentary current to flow, which can be detected. a. Mass spectrometer b. Cyclotron c. Geiger counter d. Radio tracer e. Linear accelerator 9. What is one of the drawbacks to radiocarbon dating? a. A fairly large piece of the object (up to several grams) must be burned
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This note was uploaded on 11/03/2009 for the course CHEM 1403 taught by Professor Leornardfine during the Fall '07 term at Columbia.

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Practice2ans - Practice Questions (with answers) Quiz #2...

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