Rate of reaction Flashcards
What does a catalyst do?
increases the rate of the reaction
Is a catalyst changed in a reaction?
no, it is unchanged at the end of the reaction
How does a catalyst speed up a reaction?
by providing an alternative pathway with a lower activation energy
What is the effect of increasing concentration on the rate of reaction? Why?
- increases rate of the reaction
- number of reactant particles increases
- increased chance of successful collisions
What is the effect of increasing pressure on gases on the rate of reaction? Why?
- increases rate of reaction
- number of particles in a given volume increases
- increased chance of successful collisions
What is the effect of increasing surface area of solids on the rate of reaction? Why?
- increases rate of reaction
- when solids react, it occurs on substance surface
- more surface area exposed
What is the effect of increasing the temperature on the rate of reaction? Why?
- increases rate of reaction
- particles gain more kinetic energy, move faster
- particles collide more often
- more chance of a successful collision
What must occur for a ‘successful’ chemical reaction to take place?
- particles must collide
- collide with correct orientation
- collide with sufficient KE
In collision theory, what is the relationship between concentration and RoR?
directly proportional
In collision theory, what happens to the RoR when particles get a higher KE?
particles with more energy mean more collisions are successful, increasing collision rate
What is activation energy?
the minimum energy requires for a reaction to happen
What happens if particles collide more frequently with each other?
more collisions are successful, increases RoR
What are 2 ways to investigate the rate of reaction?
- change in mass of a reactant/product
- formation of a gas
