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The mass of 1.12 liters of gas Y at STP is found to be 6.23 g. The molar mass of gas Y
is
A)56.0 g/mol
B)89.0 g/mol
C)125 g/mol
D) g/mol
E)157 g/mol
Consider the freezing of liquid water at -10°C. For this process what are the signs for
DH, DS, and DG?
A) + - 0
B) + - -
C) - + 0
D) - + -
E) - - -
What is the bond order of C2
+?
A)0
B)
C)1
D)
E)2
Which statement is true about the following reaction?
A) Energy is absorbed in the reaction.
B) Energy is released in the reaction.
C) No energy change is associated with the reaction.
D) Not enough information is given to determine the energy change.
E) None of these.
When a stable diatomic molecule spontaneously forms from its atoms, what are the
signs of H°, S°, and G°?
A) + + +
B) + - -
C) - + +
D) - - +
E) - - -
Calculate 5.1234 + 0.033 ¸ 1.650 and report to the correct number of significant figures.
A)3.1 C)5.143
B)3.125 D)5.1
Which separation technique is based on differences in the volatility of the substances to
be separated?
A) filtration C) solvent extraction
B) distillation D) paper chromatography
Use the potential energy diagram shown to answer the following:
Which letter shows the activation energy using a catalyst?
A)a
B)b
C)c
D)d
E)e
In the quantum theory, the angular orbital momentum quantum number is most directly
associated with which property of orbitals?
A)energy
B)size
C)orientation
D)shape
Use the molecules below to answer the next three questions.
Which molecule(s) have equivalent C-C bonds throughout the molecule?
A)I
B)II
C)III
D)all of the above
E)none of the above
Tabulated below are initial rate data for the reaction:
2Fe(CN)6
3-+ 2I---> 2Fe(CN)6
4-+ I2
What is the value of k?
A)107M-5s-1
B)103M-3s-1
C)10 M-2s-1
D)50 M-2s-1
E)none of these
Larger first ionization energy, Na or Rb
For the reaction aA --> Products, use the following choices
a) zero order in A
b) first order in A
c) second order in A
d) a, b, c
e) none of the above
The rate is constant over time.
Determine the molarity of a solution containing 6.76g BaCl2in 750.0 mL of solution.
Use the following information to determine the activation energy for the reaction shown
here:
Express 165,000 in exponential notation.
