Consider the compound crotonaldehyde, whose skeleton is:
How many nonbonding electrons appear in the Lewis structure of this molecule?
A)2
B)4
C)6
D)8
E)10
Determine the units of k for the reaction: C2H4Br2+ 3KI –> C2H4+ 2KBr +KI3, given
the initial rate data below?
A)mol/L
B)mol/L·s
C)1/s
D)L/mol·s
E)L2/mol2·s
Solid KF has a lattice energy of 804 kJ/mol and a heat of solution (in water) of -15
kJ/mol. RbF has a lattice energy of 768 kJ/mol and a heat of solution (in water) of -24
kJ/mol. Which salt forms stronger attractions with water?
A)KF, since it has a larger lattice energy.
B)RbF, since it has a smaller lattice energy.
C)KF, since it has a more negative heat of hydration.
D)RbF, since it has a more negative heat of hydration
E)They form equally strong attractions with water, since they both have negative heats
of mixing.
When ignited, solid ammonium dichromate decomposes in a fiery display. This is the
reaction for a “volcano” demonstration. The decomposition produces nitrogen gas,
water vapor, and chromium(III) oxide. The temperature is constant at 25°C
Determine G° (in kJ/mol).
A) -191.4
B) -2281.4
C) -38.9
D) 1903.6
E) -1555.4
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
Which of the molecules obeys the octet rule?
A)I
B)II
C)III
D)IV
E)V
The Second Law of Thermodynamics states that
A) energy is conserved in a spontaneous process.
B) the entropy of the universe increases during a spontaneous process.
C) the heat content of the universe increases during a spontaneous process.
D) all of these are valid components of the second law.
E) none of these is correct.
If a molecule demonstrates paramagnetism, then :
I.The substance can have both paired and unpaired electrons.
II.The bond order is not a whole number.
III.It can be determined by drawing a Lewis structure.
IV.It must be an ion.
A)I, II
B)I, II, IV
C)II, III
D)I only
E)All of the above are correct.
Calculate the solubility product of silver iodide at 25°C given the following data:
A) 2.9 x 10-3
B) 1.9 x 10-4
C) 2.1 x 10-12
D) 8.4 x 10-17
E) 6.1 x 10-26
The rate law of a particular reaction is found to be, rate = k[A]2[B]. Which of the
following statements is FALSE?
A)The reaction is third order overall.
B)The units of k could be (L2/mol2s)
C)Tripling the concentration of A will result in a nine-fold increase in the rate.
D)The actual value of k will depend on the temperature
E)The actual value of k will depend on the concentrations of A and B.
If you could increase the concentration of Al3+, which of the following is true about the
cell potential?
A) It would increase.
B) It would decrease.
C) It would remain constant.
D) Cannot be determined.
E) None of these (A-D).
In which of the following does iodine have the lowest oxidation state?
A)LiIO3
B)IO2
C)I2O
D)NH4I
E)I2
Balance this equation using the smallest possible integers, S + HNO3–> H2SO4+ NO2+
H2O. What is the coefficient of water.
A)1
B)2
C)4
D)6
E)10
Consider the representations below to answer the next three questions.
(I)
(II)
(III)
How many of the following statements are correct concerning drawing I?
I.Each molecule induces a dipole onto the next molecule in close proximity.
II.The phenomenon shown is relatively weak and short–lived.
III.C8H18contains this type of interaction.
IV.The forces that exist in this example are London dispersion forces.
A)0
B)1
C)2
D)3
E)4
How many of the following electron configurations for the species in their ground state
are correct?
I.Ca:1s22s22p63s23p64s2
II.Mg:1s22s22p63s1
III.V: [Ar]3s23d3
IV.As:[Ar]4s23d104p3
V.P:1s22s22p63p5
A)1
B)2
C)3
D)4
E)5