Rate Of Reaction Flashcards
(25 cards)
What is the rate of reaction?
The rate of reaction is the speed at which reactants are converted into products in a chemical reaction.
True or False: The rate of reaction can be affected by temperature.
True
Which of the following factors does NOT affect the rate of reaction: concentration, temperature, or color?
Color
Fill in the blank: Increasing the concentration of reactants generally __________ the rate of reaction.
increases
What is the effect of temperature on the rate of reaction?
Increasing temperature usually increases the rate of reaction.
Define ‘activation energy’.
Activation energy is the minimum energy required for a chemical reaction to occur.
True or False: Catalysts increase the activation energy of a reaction.
False
What role do catalysts play in chemical reactions?
Catalysts lower the activation energy and increase the rate of reaction.
Multiple Choice: Which of the following increases the rate of a reaction? A) Decreasing temperature B) Increasing surface area C) Decreasing concentration
B) Increasing surface area
What is the relationship between surface area and the rate of reaction?
Increasing surface area increases the rate of reaction.
Fill in the blank: The rate of reaction can be expressed mathematically as the change in __________ over time.
concentration
True or False: The rate of reaction is constant throughout the course of the reaction.
False
What is a reaction mechanism?
A reaction mechanism is a step-by-step description of how a chemical reaction occurs.
Multiple Choice: Which factor does NOT typically affect the rate of reaction? A) Pressure B) Volume of the container C) Nature of the reactants
B) Volume of the container
What is the effect of pressure on the rate of reaction for gases?
Increasing pressure generally increases the rate of reaction for gases.
Fill in the blank: The rate law expresses the relationship between the rate of a reaction and the __________ of the reactants.
concentration
What does the order of a reaction indicate?
The order of a reaction indicates how the rate is affected by the concentration of reactants.
True or False: A zero-order reaction has a rate that is independent of the concentration of reactants.
True
What is meant by ‘half-life’ in the context of reaction rates?
Half-life is the time required for the concentration of a reactant to decrease to half its initial value.
Multiple Choice: In a first-order reaction, the rate is directly proportional to which of the following? A) Concentration of one reactant B) Square of the concentration C) The temperature
A) Concentration of one reactant
Fill in the blank: The __________ effect refers to the increase in reaction rate due to the presence of a catalyst.
catalytic
What is an elementary step in a reaction mechanism?
An elementary step is a single, simple reaction that is part of a more complex reaction mechanism.
True or False: The overall rate of reaction can be determined from the slowest step in the reaction mechanism.
True
What is the significance of the Arrhenius equation?
The Arrhenius equation relates the rate constant of a reaction to temperature and activation energy.
