A particular reaction has a very small frequency factor. What does this imply about the reaction?
A. The reactants often collide with the correct orientation to form the transition state
B. The reactants don't often collide with the correct orientation to form the transition state
C. The reactants have enough energy to overcome the activation energy barrier
D. The reactant molecules are large - B. The reactants don't often collide with the correct orientation to
form the transition state
In aqueous solution, hypobromite ion, BrO-, reacts to produce bromate ion, BrO3- and bromide ion, Br-,
according to the following chemical equation: 3BrO- (aq) --> BrO3- (aq) + 2Br- (aq). A plot of 1/BrO- is
0.80 M. What is the value of the rate constant for this reaction?
A. 0.056 M-1s-1
B. -0.05 M-1s-1
C. 0.80 M
D. 18 M/s - A. 0.056 M-1s-1
Which part of the Arrhenius equation contains a term which measures the number of molecules that
have the correct orientation for reaction?
A. activation energy
B. exponential factor
C. frequency factor
D. none of these - C. frequency factor
The reaction 2A + B --> 2D + E is found to be first order with respect to A and second order with respect
to B. What are the units for the rate constant?
A. M/s
B. M-1s-1
C. s-1
D. M-2s-1 - D. M-2s-1
, Which of the following is true regarding coffee cup calorimetry?
A. The specific heat of the solution is assumed to be the same as water.
B. The temperature change represents the heat transfer to and from the solution.
C. The surroundings are considered to be the solvating water molecules.
D. All of the above are true. - D. All of the above are true
A balloon is inflated form 0.0100 L to 0.400 L against an external pressure of 10.00 atm while it absorbed
22 J of heat. What is the change in internal energy for the balloon?
A. -17.5 J
B. -373 J
C. 18.1 J
D. 21.6 J - B. -373 J
The value of deltaH for the reaction below is -126 kJ. The amount of heat that is released by the reaction
of 0.32 mol of Na2O2 with water is ___ kJ.
A. 20.2
B. 40.4
C. 67.5
D. 80.8 - A. 20.2
For a reaction with the rate law, rate=k[A][B]2, what will happen to the rate if the concentration of A is
doubled and the concentration of B is tripled? Rate will:
A. increase by a factor of 4
B. increase by a factor of 6
C. increase by a factor of 12
D. increase by a factor of 18 - D. increase by a factor of 18
A chemical reaction that absorbs heat from the surroundings is said to be _____ and has a _____ deltaH
at a constant pressure.
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