Rates and equilibrium Flashcards
What is meant by exothermic
reaction where energy is transferred to the surroundings
How do catalysts work
speed up reactions by:
- providing an alternate reaction pathway with a lower activation energy
- which increases frequency of collisions as less energy is required for particles
How does temp affect rate of reaction
- more kinetic energy in particles, therefore more rapid movement and higher frequency of collisions
- thus more successful reactions
- increased rate of reaction
How does concentration affect rate of reaction
- more reactants/particles available for collisions
- more successful collisions
- increased rate of reaction
Equation for mean rate of reaction
mean rate= quantity of product formed/ time taken(s)
Factors affecting rate of reaction
- temp
- concentration
- SA
- catalysts
What is the collision theory
idea that particles must collide with a certain activation energy and orientation for a successful collision
How does SA affect rate of reaction
- increases frequency of collisions (and thus successful collisions) as more molecules are available
- increases rate of reaction
What are catalysts
substances which increase rate of reaction without being used up
Why are catalysts normally used in forms of powders or pellets
- increases Sa so that catalysts is as effective as possible
What is a reversible reaction
where reactants can react to form products and products can react to make reactants again
What is meant by endothermic
when a reaction takes in energy from its surroundings
