Which of the following nuclides would be most expected to undergo a-decay?
A) 86As
B) 127I
C) 252Es
D) 9C
E) 171Ir
In the reaction:
CaO(s) + SO2(g) –> CaSO3(s)
A) Ca2+acts as a Lewis acid and SO3
2-acts as a Lewis base.
B) O2-acts as a Lewis base and SO2acts as a Lewis acid.
C) O2-acts as a Lewis base and Ca2+acts as a Lewis acid.
D) CaO is the Lewis acid and CaSO3is its conjugate base.
E) SO2is the Lewis acid and CaSO3is its conjugate base.
Using the following Kavalues, indicate the correct order of base strength.
A) CN–> NO2
–> F–> H2O > Cl–
B) Cl–> H2O > F–> NO2
–> CN–
C) CN–> F–> NO2
–> Cl–> H2O
D) H2O > CN–> NO2
–> F–> Cl–
E) none of these
A general reaction written as A + 2B –> C + 2D is studied and yields the following
data:
What is the order of the reaction with respect to A?
A)0
B)1
C)2
D)3
E)4
When some Cl2(g) is added at constant volume and temperature, the ratio of the partial
pressure of PCl5to the partial pressure of PCl3will
A) increase
B) decrease
C) stay the same
D) impossible to tell without more information
E) none of these
Draw the Lewis structures of the molecules below and use them to answer the
following questions:
I.BH3
II.NO2
III.SF6
IV.O3
V.PCl5
How many of the molecules have no dipole moment?
A)1
B)2
C)3
D)4
E)They are all polar.
An atom of 131I has a mass of 130.906114 amu. Calculate the binding energy per
MOLE in kJ.
A) 1.06 x 1014
B) 1.18
C) 1.06 x 1017
D) 1.06 x 1011
E) 1097
For the reaction A –> Products, successive half-lives are observed to be 10.0 min and
40.0 min.The reaction follows the integrated rate law
A)
B)
C)
D)
E)none of these
In the balanced cell reaction, what is the stoichiometric coefficient for H+?
A) 5
B) 6
C) 30
D) 22
E) 2
The alkali metal hydrides are excellent ________
A) oxidizing agents
B) reducing agents
C) oxidants
D) acids
E) energy sources
The questions below refer to the following system:
When cobalt(II) chloride is added to pure water, the Co2+ions hydrate. The hydrated
form then reacts with the Cl–ions to set up the equilibrium shown here.
Which statement below describes the change that the system will undergo if silver
nitrate is added?
A) It should become more blue.
B) It should become more pink.
C) Water will be produced.
D) The silver ion will react with the CoCl4
2-.
E) Nothing will change.
Which types of processes are likely when the neutron-to-proton ratio in a nucleus is too
low?
A) I, II
B) II, III
C) III, IV
D) II, III, IV
E) II, IV
Determine the standard potential, , of a cell that employs the reaction:
Fe + Cu2+–> Cu + Fe2+.
A) -0.101
B) -0.781
C) 0.101
D) 0.781
E) -0.202
Which choice has the bonds listed in the order of INCREASING bond energy?
A)HF < HCl < HBr
B)C-O < C=O < CºO
C)F2< Cl2< Br2
D)N2< CC bond in C2H4< CC Bond in C2H6
E)all the same
Which of the following is the correct order for molecules from most to least polar?
A)CH4> CF2Cl2> CF2H2> CCl4> CCl2H2
B)CH4> CF2H2> CF2Cl2> CCl4> CCl2H2
C)CF2Cl2> CF2H2> CCl2H2> CH4= CCl4
D)CF2H2> CCl2H2> CF2Cl2> CH4= CCl4
E)CF2Cl2> CF2H2> CCl4> CCl2H2> CH4
Which of the following contains the shortest bond?
A)N2
B)N2
–
C)N2
2-
D)N2
+
E)N2
2+
Given the following bond energies:
C−C347 kJ/mol
C=C614 kJ/mol
C−O358 kJ/mol
C=O 799 kJ/mol
C−H413 kJ/mol
O−H 463 kJ/mol
O−O146 kJ/mol
estimate DH for the reaction H2O2+ CH3OH –> H2CO + 2H2O.
A)−345 kJ
B)−199 kJ
C)−105 kJ
D)+199 kJ
E)+345 kJ
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.
What is the value of n?
A)0
B)0.5
C)1
D)1.5
E)2
Consider the reaction, which is exothermic as written, PCl5(g) PCl3(g) + Cl2(g).
Which of the following changes would result in the production of LESS Cl2(g)?
I.adding PCl3(g)
II.removing PCl3(g)
III.reducing the volume of the container
IV.removing PCl5(g)
V.increasing the temperature
VI.increasing the volume of the container
VII.adding PCl5(g)
VIII.reducing the temperature
IX.adding a suitable catalyst
A) II, III, VII, VIII
B) I, III, IV, V
C) I, III, IV, VIII
D) I, V, VI, VII
E) I, III, IV, V, IX
Calculate the lattice energy of the ionic compound MCl2given the information below:
DH°fMCl2(s) = -342 kJ/mol
IE1of M = +600 kJ/mol
IE2of M = +1150 kJ/mol
Cl2(g) => 2 Cl(g) DH = +244 kJ
Cl(g) + 1 e–=> Cl–(g) DH = -349 kJ
M(s) => M(g) DH = +150 kJ
A)-2136 kJ
B)-2015 kJ
C)-1446 kJ
D)-1788 kJ
E) -1666 kJ