Rate of Reaction Flashcards
What is the equation for mean rate of reaction?
Quantity of reactant used/product formed ÷ time taken.
What value is used to calculate the mean rate of reaction in reactions involving a gas?
The volume of gas or change in the mass of the reaction mixture.
How do you calculate rate of reaction on a graph?
Find point and draw a tangent, then calculate the gradient of the tangent.
How do you calculate the rate of reaction between two points?
(Value 1 - value 2) ÷ time taken.
What is collision theory?
The principle that, for reactions to occur, particles must (have enough energy to) collide.
What is activation energy?
The minimum amount of energy required for particles to have before a reaction will take place.
What is a catalyst?
A substance that can lower the activation energy of particles without itself being used up.
What four factors affect the rate of reaction?
Temperature, concentration, pressure, surface area
How does increasing pressure increase the rate of reaction?
There is less space between particles, so there are more frequent successful collisions.
How does increasing concentration of a solution increase the rate of reaction?
There are more reactant particles in the reaction mixture, so there are more frequent successful collisions.
How does increasing surface area affect the rate of reaction?
Only reactant particles on the surface of a solid are able to react. As such, the greater the surface area, the greater the amount of particles that are exposed, so there are more frequent successful collisions.
How does increasing temperature increase the rate of reaction?
- Particles have more kinetic energy and move faster, so there are more frequent successful collisions. 2. Particles have more energy, so more collisions result in a reaction.
