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The dissolution of in water is an endothermic process. According to Le Chatelier's principle, which of the following will increase the solubility of ?
Adding more to the solution.
Decreasing the temperature of the solution.
Increasing the temperature of the solution.
Adding a common ion, like .
The following reaction is exothermic: . Which change will result in an increase in the concentration of C at equilibrium?
Increasing the temperature.
Decreasing the pressure.
Adding a catalyst.
Decreasing the temperature.
For the exothermic reaction , increasing the temperature will:
Shift the equilibrium to the left
Shift the equilibrium to the right
Have no effect on the equilibrium position
Increase the concentration of C
Which of the following factors does NOT affect the rate of a chemical reaction?
Concentration of reactants
Temperature
Presence of a catalyst
The volume of the container (for reactions not involving gases)
Which statement BEST describes the relationship between the rate constant (k) and temperature (T)?
k is directly proportional to T
k is inversely proportional to T
k increases exponentially with increasing T
k decreases exponentially with increasing T
Increasing the temperature of a reaction generally increases the reaction rate. Which aspect of collision theory best explains this observation?
Increased temperature reduces the activation energy of the reaction.
Increased temperature changes the orientation of the colliding molecules.
Increased temperature decreases the frequency of collisions between molecules.
Increased kinetic energy of molecules leads to more collisions exceeding the activation energy.
Which of the following concentration terms is NOT affected by temperature?
Molality
Molarity
Normality
Formality
Increasing the temperature generally increases the reaction rate because:
The activation energy decreases
More molecules have sufficient energy to react
The concentration of reactants increases
The molecules become larger
Which factor does NOT directly influence the rate of a reaction according to collision theory?
Reactant concentration
Temperature
Activation energy
Product concentration
The solubility of gases in liquids generally:
Increases with increasing temperature
Decreases with increasing temperature
Is independent of temperature
Increases with increasing pressure and decreasing temperature
