Rates Of Reactions Flashcards
What is the definition of 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: The rate of reaction is constant throughout the entire reaction.
False
Fill in the blank: The rate of reaction can be affected by temperature, concentration, surface area, and _____ .
catalysts
Which factor increases the rate of reaction by providing more energy to the reactants?
Temperature
What is a catalyst?
A catalyst is a substance that increases the rate of a reaction without being consumed in the process.
What effect does increasing the concentration of reactants have on the rate of reaction?
It generally increases the rate of reaction.
What is the relationship between surface area and the rate of reaction?
Increasing the surface area of solid reactants increases the rate of reaction.
Multiple Choice: Which of the following is NOT a factor affecting the rate of reaction? A) Temperature B) Pressure C) Color D) Concentration
C) Color
True or False: Higher pressure increases the rate of reaction for gases.
True
What is one way to measure the rate of reaction experimentally?
By measuring the change in mass or volume of reactants or products over time.
Fill in the blank: The unit of rate of reaction is typically expressed in _____ per unit time.
moles
What is the effect of a catalyst on the activation energy of a reaction?
A catalyst lowers the activation energy of a reaction.
What is the activation energy?
The minimum energy required for a reaction to occur.
Multiple Choice: Which of the following methods can be used to measure the rate of a reaction? A) Gas collection B) Color change C) Temperature change D) All of the above
D) All of the above
What is the purpose of a control in a reaction rate experiment?
To provide a baseline for comparison with experimental results.
True or False: The presence of a catalyst is always necessary for a chemical reaction to occur.
False
How does increasing temperature affect the kinetic energy of particles?
It increases the kinetic energy of the particles.
What is a common visual indicator of a reaction rate experiment involving a color change?
The solution changing color indicates the progress of the reaction.
Fill in the blank: In a reaction rate experiment, the time taken for a precipitate to form can be used to measure the _____ of reaction.
rate
What is the relationship between concentration and the frequency of collisions between molecules?
Higher concentration leads to more frequent collisions between molecules.
Multiple Choice: What happens to the rate of reaction if the temperature is decreased? A) Increases B) Decreases C) Stays the same D) Cannot be determined
B) Decreases
What type of reaction is typically used to demonstrate the effect of surface area on reaction rates?
A reaction between a solid and a liquid or gas.
True or False: The rate of reaction can be affected by the physical state of the reactants.
True
What is the primary reason for measuring the volume of gas produced in a reaction?
To determine the rate of reaction.
