Chemical Kinetics

What is the study of reaction rates called?

• kinetics

• stoichiometry

• thermodynamics

• equilibrium

Define rate law in chemical kinetics.

• An equation that relates the rate of a reaction to the concentration of reactants

• An equation that predicts the products of a chemical reaction

• A formula that calculates the activation energy of a reaction

• A method to determine the equilibrium constant of a reaction

What does Le Chatelier's principle state?

• Le Chatelier's principle states that increasing pressure will always shift the equilibrium towards the reactants.

• Le Chatelier's principle states that if a system at equilibrium is subjected to a change in temperature, pressure, or concentration of reactants/products, the system will shift its position to counteract the imposed change and establish a new equilibrium.

• Le Chatelier's principle states that reactions always proceed to completion.

• Le Chatelier's principle states that equilibrium can only be achieved in closed systems.

How does temperature affect reaction rates?

• Temperature decreases the reaction rate by slowing down molecular movement.

• Temperature increases the reaction rate by providing more energy for successful collisions.

• Temperature increases the reaction rate by decreasing the number of collisions.

• Temperature has no effect on reaction rates.

Explain the concept of activation energy.

• Activation energy is the energy released during a chemical reaction.

• Activation energy is the minimum energy required to initiate a chemical reaction.

• Activation energy is the energy stored in chemical bonds.

• Activation energy is the energy required to stop a chemical reaction.

What role do catalysts play in reaction rates?

• Catalysts lower the activation energy required for a reaction to occur.

• Catalysts have no impact on reaction rates.

• Catalysts increase the activation energy required for a reaction to occur.

• Catalysts change the stoichiometry of the reaction.

How does concentration of reactants affect reaction rates?

• Higher concentration of reactants generally increases reaction rates.

• Concentration of reactants only affects the color of the reaction.

• Lower concentration of reactants decreases reaction rates.

• Concentration of reactants has no effect on reaction rates.

Discuss the effect of surface area on reaction rates.

• Increasing the surface area of reactants decreases the reaction rate.

• Surface area has no effect on reaction rates.

• Decreasing the surface area of reactants increases the reaction rate.

• Increasing the surface area of reactants increases the reaction rate.

What is the order of a reaction?

• The order of a reaction is the number of reactants involved in the reaction.

• The order of a reaction is always a whole number.

• The order of a reaction is the sum of the powers to which the concentrations of the reactants are raised in the rate law equation.

• The order of a reaction is determined by the temperature of the reaction.

How do changes in pressure impact reaction rates?

• Changes in pressure impact reaction rates by increasing the size of the reactant molecules.

• Changes in pressure impact reaction rates by altering the color of the reactants.

• Changes in pressure impact reaction rates by affecting the concentration of reactant molecules.

• Changes in pressure impact reaction rates by changing the temperature of the reaction.