Determine the value of k (without units) for the reaction: C2H4Br2+ 3KI –> C2H4+
2KBr +KI3, given the initial rate data below?
A)0.149
B)0.538
C)0.0830
D)0.299
E)0.598
The following data were collected for the decay of HO2radicals:
Which of the following best describes the reaction?
A)The decay of HO2occurs by a first-order process.
B)The half-life of the reaction is 2 ms.
C)A plot of ln [HO2] versus time is linear with a slope of -k.
D)The rate of the reaction increases with time.
E)A plot of 1/[HO2] versus time gives a straight line.
How many protons, neutrons and electrons, in that order are present in the anion formed
by one atom of 79Se?
A)34, 34, 45
B)34, 45, 34
C)32, 45, 34
D)34, 45, 36
E)36, 45, 36
Given the following values of pKa, determine which is the weakest base of the answers
listed.
AcidpKa
HClO21.95
HClO7.54
HCOOH3.74
HF3.17
HNO23.15
A) ClO2
–
B) ClO–
C) HCOO–
D) F–
E) Cl–
Substance X has a heat of vaporization of 47.1kJ/mol at its normal boiling point
(423°C). For the process X(l) –> X(g) at 1 atm and 423°C calculate the value of S.
A) 0
B) 67.7 J/K mol
C) 111 J/K mol
D) -67.7 J/K mol
E) -111 J/K mol
In a phosphorous-chlorine bond, the bond is _____ and the _____ atoms bears _____
charge
A)polar, P, a partial negative
B)nonpolar, Cl, no partial
C)polar, P, a partial positive
D)nonpolar, P, no partial
E)polar, Cl, a partial positive
Select a correct set of quantum numbers (n, l, ml, ms) for the highest energy electron in
the ground state of tin, Sn
A)5, 1, 2, +1/2
B)5, 2, -1, 1/2
C)5, 1, 1, 1
D)5, 1, 0, +1/2
E)5, 2, 0, -1/2
Which of the following solutions is incorrectly described?
A) 0.25 M NaH would be basic
B) 0.15 M KBr would be neutral
C) 0.25 M NH4Cl would be acidic
D) 0.15 M HN3would be acidic
E) 0.20 M ClOH would be basic
Which of the following result(s) in an increase in the entropy of the system?
A) I
B) II, V
C) I, III, IV
D) I, II, III, IV
E) I, II, III, V
Which of the following aqueous solutions will have the LOWEST vapor pressure?
A)0.20 m C6H12O6
B)0.20 m NaCl
C)0.10 m CaCl2
D)0.40 m C2H5OH
E)0.20 m Na2SO4
Given:
Cu2O(s) + O2(g) –> 2CuO(s)DH° = -144 kJ
Cu2O(s) –> Cu(s) + CuO(s)DH° = +11 kJ
Calculate the standard enthalpy of formation of CuO(s).
A)-166 kJ
B)-299 kJ
C)+299 kJ
D)+155 kJ
E)-155 kJ
Which of the following nuclides is most likely to be unstable?
A) 35Cl
B) 234Th
C) 2H
D) 4He
E) 52Cr