rates of reactions Flashcards
(24 cards)
What is the definition of 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: Increasing the temperature generally increases the rate of reaction.
True
Fill in the blank: The rate of reaction can be affected by factors such as concentration, temperature, surface area, and ___.
catalysts
What effect does increasing the concentration of reactants have on the rate of reaction?
Increasing the concentration usually increases the rate of reaction.
What is a catalyst?
A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process.
Multiple choice: Which of the following factors does NOT affect the rate of reaction? A) Temperature B) Pressure C) Color D) Surface area
C) Color
What is the relationship between surface area and the rate of reaction?
Increasing the surface area of a solid reactant increases the rate of reaction.
True or False: The rate of reaction is constant throughout the reaction.
False
What does the collision theory state?
Collision theory states that for a reaction to occur, reactant particles must collide with sufficient energy and the correct orientation.
Fill in the blank: The ___ is the minimum energy required for a reaction to occur.
activation energy
Multiple choice: Which type of reaction typically has a faster rate? A) Exothermic B) Endothermic
A) Exothermic
What is the effect of temperature on the kinetic energy of particles?
Increasing the temperature increases the kinetic energy of particles.
True or False: Reactants must collide to react, but not all collisions result in a reaction.
True
What is the formula for calculating the rate of reaction?
The rate of reaction can be calculated as the change in concentration of a reactant or product over time.
Fill in the blank: A reaction that occurs quickly has a ___ rate of reaction.
high
What happens to the rate of reaction as the reactants are used up?
The rate of reaction decreases as the reactants are used up.
Multiple choice: Which of the following can be a result of increasing the temperature? A) Slower reaction B) Faster reaction C) No change
B) Faster reaction
What is the role of temperature in increasing the rate of reaction?
Temperature increases the energy of particles, leading to more frequent and effective collisions.
True or False: A higher pressure can increase the rate of reaction for gases.
True
What is meant by the term ‘reaction mechanism’?
A reaction mechanism is the step-by-step sequence of elementary reactions by which overall chemical change occurs.
Fill in the blank: The ___ is the point at which the rate of the forward reaction equals the rate of the reverse reaction.
equilibrium
What is the effect of a catalyst on the activation energy of a reaction?
A catalyst lowers the activation energy of a reaction.
Multiple choice: Which of the following statements is true? A) All reactions occur at the same rate B) Reaction rates can vary C) Reaction rates are always constant
B) Reaction rates can vary
What is the significance of the rate constant in a reaction?
The rate constant is a proportionality factor that relates the rate of reaction to the concentration of reactants.
