Chemistry - Check List Flashcards
What is the definition of rate of reaction?
The speed at which reactants are converted into products in a chemical reaction
Rate of reaction can be measured in different units such as mol/L/s or g/s.
What are some factors that can affect the rate of a chemical reaction?
- Temperature
- Surface area
- Concentration
- Pressure
- Catalysts
Each factor influences how frequently and effectively reactant particles collide.
How does temperature affect the rate of reaction according to collision theory?
Increasing temperature increases the kinetic energy of particles, leading to more frequent and energetic collisions
This results in a higher rate of reaction.
What is the effect of changing surface area on the rate of reaction?
Increasing surface area increases the rate of reaction
More surface area allows more collisions between reactant particles.
How does changing concentration affect the rate of reaction?
Increasing concentration increases the rate of reaction
More reactant particles lead to a higher probability of collisions.
What is the definition of activation energy in a chemical reaction?
The minimum energy required for a reaction to occur
It is the energy barrier that must be overcome for reactants to form products.
What is a catalyst?
A substance that increases the rate of a reaction without being consumed in the process
Catalysts work by lowering the activation energy required for the reaction.
How does a catalyst affect the rate of a reaction?
It increases the rate of reaction by lowering the activation energy
This results in more successful collisions occurring in a given time.
Describe how changing pressure of gaseous reactants affects the rate of reaction.
Increasing pressure increases the rate of reaction
Higher pressure compresses gas particles, leading to more frequent collisions.
What is the surface area to volume ratio, and how is it calculated?
The ratio of the surface area of an object to its volume
It is calculated by dividing the surface area by the volume.
How can you calculate the rate of reaction at specific times using a graph?
By using a tangent to the curve at the desired point
The slope of the tangent represents the rate of reaction at that time.
Identify the dependent, independent, and control variables from a rates graph.
- Dependent variable: Rate of reaction
- Independent variable: Concentration, temperature, pressure, etc.
- Control variables: Factors kept constant during the experiment
Understanding these variables is crucial for analyzing the effects on reaction rates.
