When the concentration of reactant molecules is increased, the rate of reaction increases. The best explanation is : As the reactant concentration increases, a. the average kinetic energy of molecules increases b. the frequency of molecular collisions increases. c. the activation energy increases d. the activation energy increases. e. None
When the concentration of reactant molecules is increased, the
a. the average kinetic energy of molecules increases
b. the frequency of molecular collisions increases.
c. the activation energy increases
d. the activation energy increases.
e. None
In the reaction, H2(g) I2(g) ____ 2HI(g), the equilibrium concentration were found to be [H2] =[I2] = 0.86 M and [HI] = 0.27M. What is the value of Kc ?
a. 0.009857
b. 0.9857
c. 0.09856
d. 9.857
Given the Equation: 2C(g) + 2D(g) = 3E(g) + F(g) + heat ,Predict the direction of the shift in equilibrium, Addition of compound C.
a. forward
b. backward
c. no change
Given the Equation: 2C(g) + 2D(g) = 3E(g) + F(g) + heat ,Predict the direction of the shift in equilibrium, Removal of compound E
a. FORWARD
b. BACKWARD
c. NO CHANGE
Given the Equation: 2C(g) + 2D(g) = 3E(g) + F(g) + heat ,Predict the direction of the shift in equilibrium, Increase in pressure
a. farward
b. backward
c. no change
Given the Equation: 2C(g) + 2D(g) = 3E(g) + F(g) + heat ,Predict the direction of the shift in equilibrium, Increase in temperature
a. forward
b. backward
c. no change
Given the Equation: 2C(g) + 2D(g) = 3E(g) + F(g) + heat ,Predict the direction of the shift in equilibrium, Addition of a catalyst.
a. forward
b. backward
c. no change
Most reactions are carried out in liquid solution or in the gaseous phase because in such situations
a. Activation energies are higher.
b. It is easier for reactants to come in contact with each other.
c. Kinetic energies of reactants are lower.
d. Products are less apt to decompose.
The minimum combined kinetic energy reactant particles must possess in order for their collision to result in a reaction is called the
a. dissociation energy
b. collision energy
c. activation energy
d. orientation energy
e. None
Whether a reaction is exothermic or endothermic is determined by
a. the activation energy
b. the physical state of the reactants
c. how reactant and product potential energies compare
d. whether a catalyst is present
e. None
Which of the following changes is most likely to decrease reaction rate for the
a. adding twice as much O2 to the reaction mixture
b. tripling the temperature of the reaction mixture
c. adding a catalyst to the reaction mixture
d. removing some CO from the reaction mixture
e. None
Catalysts are correctly characterized by each of the following statements except one. The exception is:
a. They can be either solids, liquids or gases.
b. They lower the activation energy for a reaction.
c. They do not actively participate in a reaction.
d. They are not consumed in a reaction.
e. None
For a system at
a. Forward and reverse reaction rates are equal.
b. Forward and reverse reaction rates are zero.
c. Reactant and product concentrations are equal.
d. Reactant and product concentrations are zero.
e. None
Le Chatelier's principle states that:
a. Only exothermic reactions can reach chemical equilibrium.
b. Only reactions in which a catalyst is present can reach chemical equilibrium.
c. If a chemical equilibrium is disturbed, the system will try and reestablish equilibrium.
d. If a chemical equilibrium is disturbed, the temperature of the system will always decrease.
CO2 and H2 are allowed to react until an equilibrium is established as follows: What will be the effect on the equilibrium of removing CO from the equilibrium mixture? CO2 (g) + H2(g) = H2O(g) + CO(g)
a. The equilibrium will favor the reactants side.
b. H2 concentration will double
c. CO and CO2 concentrations will double
d. H2 concentration will decrease and H2O concentration will increase
e. None
According to Le Chatelier's principle, which of the following changes will shift the position of the equilibrium to the left for the reaction N2(g) + 3H2(g) = 2NH3(g) + heat
a. double the concentration of N2
b. decrease the concentration of NH3
c. increase the concentration of H2
d. triple the temperature
e. None
For a collision between molecules to result in reaction, the molecules must possess a certain minimum energy and
a. exchange electrons
b. interact with a catalyst for at least one second
c. have a favorable orientation relative to each other when they collide
d. more than one correct response
e. no correct response
f. None
Which of the following statements about activation energy is correct?
a. It is the same for all reactions.
b. It is low for reactions that take place rapidly.
c. It is the maximum energy a reacting molecule may possess.
d. More than one correct response.
Increasing the temperature at which a chemical reaction occurs
a. will lower the activation energy
b. causes more reactant collisions to take place in a given time
c. increases disorder in the system, thus decreasing the reaction rate
d. more than one correct response
e. no correct response
f. None
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