a. In the reaction: C3 H8 + O2 -> CO2 + H2 O, if 
, then what is __ ? [15 points]
b. 
c. 
d. Rate of the reaction
Name: ______________________ period: _____
Ch. 21 & 14 nuclear chemistry & kinetics test [65 points] honors 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.
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Signature: _______________________
1. Fill-in the blank for the following (hypothetical ?) nuclear reactions. [15 points]
a. 210 Pb -> 4 He + ______
b. The beta decay of 32 P is expressed as ___________________________
c. 29 Al undergoing positron emission is expressed as _____________________________
d. 4 He + 15 N -> _____
e. 240 U -> 3 neutrons + 140 Ba + ____
2. 14 C has a half-life of 5.83 * 103 years. A sample currently has 15 mCi 14C, but originally had 85 mCi 14 C [Ci = Curie = 3.8 * 1010 isotopes disappear / second]. What is the age of the sample ? [10 points]
a. In the reaction: C3 H8 + O2 -> CO2 + H2 O, ifb.
c.
d. Rate of the reaction
Expt
[N2 ] (M)
[H2 ] (M)
Rate (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. A reaction generates 35 kJ / mole of heat under constant pressure conditions and the activation energy of the forward reaction is 45 kJ /mole. [10 points}
a. Sketch / label the reaction energy profile based on the preceding information
b. Determine the activation energy of the backward reaction