For a reaction in which A and B react to form C, the following initial rate data were
obtained:
What is the rate law?
A)Rate = k[A][B]
B)Rate = k[A]2[B]
C)Rate = k[A][B]2
D)Rate = k[A]2[B]2
E)Rate = k[A]3
Select the answer that best describes an aqueous solution made from each of the
following substances:
solid ammonium perchlorate (NH4ClO4) For NH4
+, Ka=5.6×10-10; for ClO4
–, Kb»10-21.
A) acidic
B) basic
C) neutral
D) cannot tell
E) none of these (A-D)
Which statement is INCORRECT?
A)An atom of 60Zn has an equal number of protons and neutrons
B)An atom of 50Mn has an equal number of electrons and neutrons
C)An atom of 18O has an equal number of protons and neutrons
D)An atom of 41K has an equal number of protons and electrons
E)An atom of 238U contains 146 neutrons.
Consider the reaction
2N2O5(g) 4NO2(g) + O2(g)
at 25°C for which the following data are relevant:
Calculate S° for the reaction.
A) 809.08 J/K
B) 89.38 J/K
C) 453.76 J/K
D) -265.94 J/K
E) 1164.40 J/K
The kinetics of the reaction were studied and the following results
obtained, where the rate law is:
For a run where [A]0= 1.0 x10-3M and [B]0= 5.0 M, a plot of ln [A] versus t was found
to give a straight line with slope = -5.0 x10-2s-1.
For a run where [A]0= 1.0 x10-3M and [B]0= 10.0 M, a plot of ln [A] versus t was found
to give a straight line with slope = -7.1 x10-2s-1.
Calculate the value of k (ignore units).
A)22
B)10
C)50
D)1.1
E)none of these
HA and HB are both weak acids in water, and HA is a stronger acid than HB. Which of
the following statements is correct?
A) A–is a stronger base than B–, which is a stronger base than H2O, which is a stronger
base than Cl–.
B) B–is a stronger base than A–, which is a stronger base than H2O, which is a stronger
base than Cl–.
C) B–is a stronger base than A–, which is a stronger base than Cl–, which is a stronger
base than H2O.
D) Cl–is a stronger base than A–, which is a stronger base than B–, which is a stronger
base than H2O.
E) None of these (A-D) is correct.
In which of the following groups of substances would dispersion forces be the only
significant factors in determining boiling points?
I.Cl2II.HFIII.NeIV.KNO2V.CCl4
A)I, III, V
B)I, II, III
C)II, IV
D)II, V
E)III, IV, V
Substance X has a heat of vaporization of 58.4kJ/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 Ssurr.
A) 0
B) 83.9 J/K mol
C) 138 J/K mol
D) -83.9 J/K mol
E) -138 J/K mol
How many of the following molecules have all of their atoms in the same plane?
H2C=CH2OF2H2CONH3CO2BeCl2
A)3
B)4
C)5
D)6
E)7
Which of the following samples contains the greatest number of moles of carbon
atoms?
A)58 g of C4H10
B)46 g of C2H5OH
C)44 g of CO2
D)180 g of C6H12O6
E)all contain the same number of moles of carbon atoms
The following questions refer to the reaction between nitric oxide and hydrogen
What is the rate law for this reaction?
A)Rate = k[NO]
B)Rate = k[NO]2
C)Rate = k[NO]2[H2]
D)Rate = k[NO][H2]
E)Rate = k[N2O][H2O]
The following question refers to the following system:
3Ag(s) + NO3
–(aq) + 4H+(aq) –> 3Ag+(aq) + NO(g) + 2H2O(l)
Determine the equilibrium constant at 25°C.
A)
B)
C)
D)
E) 3.117
Use the potential energy diagram shown to answer the following:
Which letter shows the activation energy (without use of a catalyst)?
A)a
B)b
C)c
D)d
E)e