Rates of reaction Flashcards
Rate of reaction can be found how?
By measuring the amount of reactant used or product formed over time.
Equations for rate of reaction:
Rate of reaction = amount of reactant used/time
or
Rate of reaction = amount of product formed/time
Chemical reactions can only occur when?
When particles collide with each other and have sufficient energy.
What is the term used to describe the amount of energy a particle must have in order for a chemical reaction to take place?
Activation energy.
Increasing the temperature does what to the rate of reaction?
Increases the rate of reaction.
Why does increasing the temperature have the effect it does on rate of reaction?
Because the particles gain energy mean they collide more frequently (kinetic theory) and more energetically (more particles of the required activation energy for the reaction).
Increasing the pressure does what to the rate of reaction?
Increases the rate of reaction.
Why does increasing the pressure have the effect it does on rate of reaction?
Because it increases the frequency at which the particles collide (same number of particles in less space).
Increasing the concentration does what to the rate of reaction?
Increases the rate of reaction.
Why does increasing the concentration have the effect it does on rate of reaction?
Because it increases the frequency of collisions between particles (more particles in the same space).
Increasing the surface area does what to the rate of reaction?
Increases the rate of reaction.
Why does increasing the surface area have the effect it does on rate of reaction?
Increases the frequency of collisions (more particles exposed to the reactant).
Catalysts can do what?
Change the rate of chemical reaction without being used up in the reaction itself. Different reactions require different catalysts.
Catalysts can do what to the activation energy of a reaction?
Reduce the activation energy.
Catalysts are important in the industry why?
They reduce the cost required to meet the activation energy and increase the rate of reaction so more product is produced in the same amount of time.
