10. For the reaction 3A(g) + 2B(g) 2C(g) + 2D(g) the following data was collecte
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10. For the reaction 3A(g) + 2B(g) 2C(g) + 2D(g) the following data was collected at constant temperature. Determine the correct rate law for this reaction Trial InitialIAl InitialIB] Initial Rate 0.200 0.100 6.00 × 10 2 0.100 0.100 1.50 x 10 3 0.200 0.200 1.20 10 0.400 0.200 4.80 × 10" A) Rate =k[A][B] B) Rate-KAB) C) Rate = k[A][Br D) Rate K[A B) E) Rate KAT[B] 11. A reaction has the following rate law: rate A][B In experiment 1, the concentrations of A and B are both 0.10 mol L- and the rate is 1.6 x 10 mol L's. What is the value of K? A) 0.016 B) 0.16 C 16 D) 0.0016 E) none of above 12. In the following diagrams, A represents a radioactive isotope that decays into a new isotope, X. Each circle represents 1 mol of atoms. What is the half-ife of A? -25.0sL C) 25.0s D) 50.0s E) 60.2s A) 6.25s B) 18.8 s 13. What is the molecularity of the following elementary reaction? 2A C A) Unimolecular D) Bimolecular C) termolecular E) Need to know the reaction order The experimental rate law for a reaction is Rate-*[A] [BJ. overall? A) 1st B) 2nd C) 3rd D) 4th E) none of above What is the order of the reaction 14. What is the name for spontaneous emission of particles or electromagnetic radiation by certain nuclei? 15. A) Protons B) Isotopes C) Radioactivity D) Neutrons E) Electrons 16. Which is an incorrect representation of the indicated particle or nucleus? A) Positron B) Neutron Jn C) Alpha particle $He D) Proton ip E) All are correct As a result of alpha decay, the product nucleus is A) one atomic number lower than the original element. B) two atomic numbers higher than the original element. C) one atomic number higher than the original element D) two atomic numbers lower than the original element. E) four atomic numbers lower than the original element. 17.Explanation / Answer
10) order w.r.t A
r1/r2 = (a1/a2)^x
(0.06/0.015) = (0.2/0.1)^x
x = 2
order w.r.t B
r1/r3 = (a1/a3)^y
(0.06/0.12) = (0.1/0.2)^y
y = 1
overall order = 2+1 = 3
rate = k*[A]^2[B]^1
answer: E
11) rate = k*[A][B]^2
1.6*10^-4 = k*(0.1*0.1^2)
k = 0.16
12) k = 1/t ln(a/a-x)
k = (1/25)ln(12/9)
= 0.0115 s-1
k = 0.693/t1/2
t1/2 = 0.693/0.0115 = 60.26 sec
answer: E
13) answer: D
because 2 molecules of A involves in the elementary reaction .
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