3.2.2 - Reaction Rates Flashcards
What is the definition of reaction rate?
The change in concentration of reactants or products per unit time.
True or False: Reaction rates can only be increased by raising the temperature.
False
Fill in the blank: The rate of a reaction typically ____ as the concentration of reactants decreases.
decreases
What effect does increasing the surface area of a solid reactant have on the reaction rate?
It increases the reaction rate.
Which of the following factors does NOT affect reaction rate? A) Concentration B) Temperature C) Color D) Pressure
C) Color
What is the role of a catalyst in a chemical reaction?
A catalyst speeds up the reaction without being consumed in the process.
What is the unit of reaction rate?
mol dm^-3 s^-1
True or False: Doubling the concentration of reactants will always double the reaction rate.
False
What does the term ‘order of reaction’ refer to?
The power to which the concentration of a reactant is raised in the rate equation.
In a first-order reaction, how does the rate change with respect to concentration?
The rate is directly proportional to the concentration.
What effect does temperature have on reaction rates?
Increasing temperature generally increases reaction rates.
Fill in the blank: The Arrhenius equation relates the rate constant to ____ and activation energy.
temperature
What is activation energy?
The minimum energy required for a reaction to occur.
True or False: A higher activation energy results in a faster reaction rate.
False
What is a rate constant?
A proportionality constant in the rate law that is specific to a given reaction at a certain temperature.
What is the effect of increasing pressure on the rate of reaction for gases?
Increasing pressure increases the reaction rate.
Which of the following will increase the rate of a gaseous reaction? A) Decreasing volume B) Increasing volume C) Decreasing temperature D) Increasing concentration
D) Increasing concentration
What type of graph is typically used to determine reaction order from experimental data?
A concentration vs. time graph.
Fill in the blank: The rate of a zero-order reaction is ____ of the concentration of reactants.
independent
What is the significance of the rate-determining step in a reaction mechanism?
It is the slowest step that determines the overall reaction rate.
True or False: A catalyst changes the activation energy of a reaction.
True
What is the term for the study of how fast reactions occur?
Kinetics
What does a reaction profile diagram illustrate?
The energy changes during the course of a reaction.
Fill in the blank: In a second-order reaction, the rate is proportional to the ____ of the concentration.
square
What is the effect of adding a catalyst to an equilibrium reaction?
It speeds up the rate of both the forward and reverse reactions equally.
