Name: ______________________________ period 6 date: _______
Ch. 21 & 14 Nuclear chem. & kinetics test [70 points] AP Chemistry
For problems involving calculations, show the relevant equation (or formula and conversion factor(s)), show your work in an organized manner, put the proper units in your calculations / answer, and have the proper number of significant figures in your answer.
Academic Honesty: The answers on this test are my own and I am using only the allowed set of notes as described in the syllabus. I have not discussed the test questions with anyone before or during the test nor have I seen the test questions prior to the exam. If you violate any of the preceding items or do not sign, your semester grade is a F.
Signature: ___________________
1. write the (hypothetical ?) nuclear reaction for __. [15 points]
a. alpha decay of 210 Pb: ____________________________
b. beta-decay of 32 P: _______________________________
c. positron emission of 29 Al: _________________________
d. nuclear fusion involving 4 He & 15 N (as reactants) form: ______
e. 240 U -> 3 neutrons + 140 Ba + _____
2. 14 C has a half-life of 5.73 * 103 years. A sample currently has 15 mCi 14C, but originally had 85 mCi 14 C; Ci = 3.7 * 1010 disintegrations / second. What is the age of the sample ? [10 points]
3. If the rate of combustion of ethane is - 5.0 mM / second, then what is the [20 points]
a. rate of appearance of carbon dioxide ?
b. rate of appearance of water ?
c. rate of disappearance of oxygen ?
d. rate of the reaction ?
4. Based on the following (hypothetical ?) experimental data,
Expt[N2 ] (M)
[H2 ] (M)
(mM / sec)
1
1.0
1.0
1.0
2
1.0
2.0
2.0
3
2.0
1.0
4.0
for the reaction: N2 + H2 -> NH3 , what is the rate law of the reaction (include the value of the exponents & rate constant, including its units) [15 points]
5. The ΔHreaction = - 35 kJ / mole; Ea, backward = 15 kJ / mole. [10 points]
a. sketch and label the reaction energy profile
b. calculate Ea, forward