Rate Of Chemical Reaction Flashcards
What is the rate of a chemical reaction?
The rate of a chemical reaction is the speed at which reactants are converted into products.
True or False: Increasing temperature generally increases the rate of chemical reactions.
True
Fill in the blank: The concentration of reactants affects the rate of reaction; higher concentration typically ______ the rate.
increases
What is the effect of surface area on the rate of a reaction?
Increased surface area typically increases the rate of a reaction.
Which factor does NOT affect the rate of a chemical reaction?
The color of the reactants.
What is the role of a catalyst in a chemical reaction?
A catalyst increases the rate of a reaction without being consumed in the process.
True or False: A catalyst alters the equilibrium position of a reversible reaction.
False
What happens to the rate of reaction as the temperature increases?
The rate of reaction generally increases with temperature.
Define ‘activation energy’.
Activation energy is the minimum energy required for a chemical reaction to occur.
What is the relationship between temperature and activation energy?
Higher temperatures can provide the energy needed to overcome activation energy.
Multiple choice: Which of the following factors affects the rate of a chemical reaction? A) Temperature B) Pressure C) Concentration D) All of the above
D) All of the above
What is the effect of pressure on the rate of reactions involving gases?
Increasing pressure generally increases the rate of reaction by decreasing the volume and increasing concentration.
Fill in the blank: The rate of reaction can be expressed in terms of the change in ______ over time.
concentration
True or False: The rate of a reaction is constant throughout the reaction.
False
What is meant by ‘rate law’?
Rate law is an equation that relates the rate of a reaction to the concentration of its reactants.
What does the rate constant (k) indicate in a rate law?
The rate constant (k) indicates the speed of the reaction at a specific temperature.
Short answer: How does increasing the concentration of reactants influence the rate of reaction?
Increasing the concentration of reactants typically increases the rate of reaction due to more frequent collisions.
Define ‘reaction mechanism’.
A reaction mechanism is a step-by-step description of the pathway taken by reactants to become products.
Multiple choice: What type of reaction typically has a slower rate? A) Exothermic B) Endothermic C) Both D) None
B) Endothermic
What is the effect of a higher activation energy on a reaction rate?
A higher activation energy generally results in a slower reaction rate.
True or False: The presence of a catalyst can lower the activation energy of a reaction.
True
What is a ‘rate-determining step’?
The rate-determining step is the slowest step in a reaction mechanism that determines the overall reaction rate.
Fill in the blank: The collision theory states that for a reaction to occur, reactant particles must ______ with sufficient energy.
collide
What does a zero-order reaction mean in terms of concentration?
In a zero-order reaction, the rate is constant and independent of the concentration of reactants.
