8. Reaction Kinetics Flashcards
What is rate of reaction?
The speed at which a chemical reaction takes place
What is an effective collision?
When particles collide in the correct orientation and have enough energy for a chemical reaction to occur
What is an inefficient collision?
When particles collide in the wrong orientation or when they don’t have enough energy and bounce off each other without causing a chemical reaction
What happens to the rate of reaction if you increase pressure?
When the pressure is increased, the molecules have less space in which they can move
The number of effective collisions increases due to an increased collision frequency
What happens to the rate of reaction if you increase the concentration?
The more concentrated a solution is, the greater the number of particles in a given volume of solvent.
Increase in concentration increases the collision frequency
What is activation energy?
The minimum energy required for a collision to be effective
How does a catalyst work?
It increases the rate of a reaction by providing the reactants with an alternative reaction pathway which is lower in activation energy than the uncatalysed reaction
What is a homogeneous catalyst?
The catalyst is in the same phase as the reactants eg reactants and catalyst are all liquids
What is a heterogenous catalyst?
The catalyst is in a different phase to the reactants, eg the reactants are gases but catalyst is a solid
