Topic 6 - Rate Or Reaction Flashcards
How can you measure the rate of reaction?
Measure how fast reactants are used
Or
How fast the products are made
What is an equation for rate of reaction?
Products formed or reactants used / time taken
What are the factors effecting the rate of reaction?
Concentration of reactants in a solution
Temperature
Pressure of reacting gasses
Surface area of solid reactants
Presence of a catalyst
What is a catalyst?
Change the rate or chemical reactions but are not used up. They work by providing a different pathway for a reaction with less activation energy
What is the collision theory?
Explains how various factors affect rates of reaction by the number of collisions there are between particles
What is activation energy?
The minimum amount of energy required for the particles to react
What is a reversible reaction?
A reaction where the products can react can produce the original reactants, the direction can be changed by changing conditions
What is equilibrium?
When both forwards and backwards reactions are happening at the same rate so they cancel each other out
What is le chataliers principle?
If you change the conditions of a reversible reaction then the position of equilibrium will change to counteract the change
What is the effect of changing conditions on a reaction?
Equilibrium would change if they conditions are changes, this can be predicted with le chataliers principle
What would happen with a increase or decrease in temp in a reversible reaction?
A decrease in temp would be counteracted by more of the exothermic reaction which gives off energy to try and counteract the change
A increase in temp would be counteracted by more of the endothermic reaction which takes in energy to try and counteract it
What would happen with a increase or decrease in pressure in a reversible reaction?
An increase in pressure will favour the side with less particles
An decrease in pressure will favour the side with more particles
What would happen with a increase or decrease in concentration in a reversible reaction?
If reactants are increased, more products are formed
If products decrease, more reactants react
