Kinetics

Which of the following represents ΔH of the forward reaction?

• AB

• CD

• DE

• F

Which of the following represents the activation energy of the forward reaction?

• AB

• CD

• DE

• F

Which value would remain unchanged if a catalyst were introduced?

• AB

• CD

• DE

• F

Which of the following represents the activation energy for the reverse reaction?

• AB

• CD

• DE

• F

The study of altering reaction rates by changing mechanisms and energy pathways is called

• thermodynamics

• catalysis

• materials studies

• kinetics

Which statement best explains why a 10°C increase in temperature can result in a substantial increase in reaction rate?

• The collision geometry is more favorable at high temperatures.

• The molecules are moving faster.

• There are more frequent collisions.

• The number of molecules that have the necessary activation energy increases.

As the reaction proceeds at constant temperature, the rate of the reaction

• remains the same unless a catalyst is added

• remains the same because the temperature is constant

• decreases because the concentration of reactant molecules decreases

• decreases because the effectiveness of collisions between reactant molecules decreases

As a reaction proceeds at constant temperature, the rate of the reaction

• remains the same unless a catalyst is added

• remains the same because the temperature is constant

• decreases because the concentration of reactant molecules decreases

• decreases because the effectiveness of collisions between reactant molecules decreases

All of the following apply to the reaction

2 C(g) --> A(g) + 2 B(g)

as it is carried out in a sealed rigid container at constant temperature EXCEPT

• The total pressure increases

• The number of molecules of A decreases

• The entropy of the system increases

• The rate of the reaction decreases

Consider the reaction and its rate law given below.

2 A (g) + B(g) --> 2 C(g)

Rate = k[A][B]

At the beginning of one trial of this reaction, [A] = 3.0 M and [B] = 1.0 M. The observed rate for the formation of C is 0.36 mol L^-1 s^-1.

Determine the [A] when [B] drops to 0.50 M.

• 2.0 M

• 1.5 M

• 1.0 M

• 0.5 M