Rates of reaction Flashcards
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
What effect does increasing the concentration of reactants have on the rate of reaction?
Increasing the concentration of reactants generally increases the rate of reaction.
Fill in the blank: The rate of reaction can be measured by the change in _____ over time.
concentration
What is the role of a catalyst in a chemical reaction?
A catalyst increases the rate of reaction without being consumed in the process.
Which of the following factors does NOT affect the rate of reaction? A) Temperature B) Surface Area C) Color D) Concentration
C) Color
What is the effect of increasing surface area on the rate of reaction?
Increasing surface area generally increases the rate of reaction.
True or False: A higher activation energy leads to a faster rate of reaction.
False
What is activation energy?
Activation energy is the minimum energy required for a reaction to occur.
Fill in the blank: The _____ theory explains how particles must collide with sufficient energy for a reaction to occur.
collision
What happens to the rate of reaction when a reaction reaches equilibrium?
The rate of the forward reaction equals the rate of the reverse reaction.
Which factor has the greatest effect on the rate of reaction in gas-phase reactions?
Temperature
What is the purpose of measuring the rate of reaction?
To understand how fast a reaction proceeds and to optimize conditions for desired outcomes.
True or False: Doubling the concentration of reactants will double the rate of reaction.
False (it depends on the order of the reaction)
What is a reaction mechanism?
A reaction mechanism is a step-by-step description of how a chemical reaction occurs.
Fill in the blank: The unit of rate of reaction is typically expressed in _____ per unit time.
moles
What does a steeper slope on a concentration vs. time graph indicate?
A steeper slope indicates a faster rate of reaction.
How does pressure affect the rate of reaction in gaseous reactions?
Increasing pressure increases the rate of reaction by reducing the volume and increasing concentration.
What type of reaction involves the breaking and forming of chemical bonds?
A chemical reaction
True or False: All reactions are exothermic.
False
What does the term ‘endothermic’ mean in relation to reactions?
Endothermic reactions absorb energy from their surroundings.
What is the relationship between temperature and kinetic energy in particles?
As temperature increases, the kinetic energy of particles also increases.
Fill in the blank: The _____ of a reaction is influenced by the nature of the reactants.
rate
What is the effect of a catalyst on activation energy?
A catalyst lowers the activation energy required for a reaction.
What is the term for a substance that slows down the rate of reaction?
Inhibitor
