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Chemistry 115 Purdue Past Exam Questions with 100% Correct Answers | Verified | Latest Update 2024 | 100% Pass| Rated A+ $13.24   Add to cart

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Chemistry 115 Purdue Past Exam Questions with 100% Correct Answers | Verified | Latest Update 2024 | 100% Pass| Rated A+

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Chemistry 115 Purdue Past Exam Questions with 100% Correct Answers | Verified | Latest Update 2024 | 100% Pass| Rated A+

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Chemistry 115 Purdue Past Exam Questions with
100% Correct Answers | Verified | Latest Update
2024 | 100% Pass| Rated A+

.



Calculate the age (in years) of a rock sample if 75.0 percent of the original amount

of thorium-232 (232Th) contained in the rock has undergone radioactive decay?

The half-life for 232Th is 1.4 x 1010 yrs.

(a) 5.8 x 109 years


(b) 7.0 x 109 years


(c) 2.1 x 1010 years

,(d) 2.8 x 1010 years


(e) 3.5 x 1010 years - ✔✔(d) 2.8 x 1010 years




Naturally-occurring uranium contains 0.005% 234U, 0.720% 235U and 99.275%

238U. In order to be used as fuel in a fission power plant, the uranium must be

enriched to contain about 3% 235U. This is necessary because


(a) 238U undergoes fission too easily.


(b) the amount of 235U in naturally-occurring uranium is too low to sustain

fission.


(c) 235U also functions as the moderator.


(d) 235U reduces the number of neutrons colliding with the fuel thereby

controlling the chain reactions. - ✔✔(b) the amount of 235U in

naturally-occurring uranium is too low to sustain fission.




Unobtainium (Ub), a fictional element mined on Pandora (Avatar), undergoes the

following fission reaction after neutron capture. What are the atomic and mass

numbers of Unobtainium (Ub)? Ub + n 0 1 → I 53 105 + La 57 146 + 3 n 0 1

, (a) 108 and 251

(b) 112 and 253


(c) 110 and 251

(d) 110 and 253


(e) 110 and 254 - ✔✔(d) 110 and 253




Sodium-23 (23Na) is formed by the β+ decay of which one of the following

isotopes?


(a) Mg 12 23


(b) Mg 12 24


(c) Mg 12 22


(d) Ne 10 22


(e) Ne 10 23 - ✔✔(a) Mg 12 23




Which one of the following nuclides would you predict to be most stable?

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