C8 Rates And Equilibrium Flashcards
How can you calcuate the soeed of an reaction?
Product formed or amount of reactant used up / Time
When does a reaction happen?
When 2 particles clooide with enough activation energy to start an reaction
What is collision theory?
More collisions mean the faster the reaction is
Particles have to collise with enough energy to start an reaction
What does the activation energy do?
Break the bonds of reactand to start the reaction
What was increase rate of reaction?
Temorature
Consentration
Surface ares
A cataylist
What does all methids of speeding up an reaction do?
Either
Increase the frequency of collisisons
Decrease the activation energy
How do you calcuate the rate of reaction from 20s and 40 for exampe?
From a graph?
You find the values of 20s and 40s and then you calcuate the gradient
Hwo do you find the rate of reaction at a particular point in a graph?
Draw a tangent and find it’s gradient
What is an equilibrium?
An reaction going both ways but there is no overall effect and nothing looks like it is happening
What is a reversabke reaction?
A reaction which the products react back to make the original reactants
What dies it mean if the eauilibrium lies to the left?
The consentration of reactants is gretaer than the consentration of products
What does it mean if the equilibrium lies to the right?
The consentration of product is greater than the consentration of the reactants
What may effect where the equilibrium lies?
Temprature
Pressure
Concentration
What is true about a reversable reaction?
The reverse reaction will the the opposite type (eg exothermic or endothermic) and the energy given out will be equal but opposite
What happens when you heat blue hydrated copper II sulfate crystals?
The water dries of and it leaves white anhydrous copper II sulfate powder
Describe the colour change when water is added to white anhrdrous … powder
Frow white to blue
What is Le Chatelier’s Principle
Because of Le Chatelier’s principek what do we know would happen if the temprature changes in an equilibrium?
If the temprature increased then the reaction shifts to the endothermic reaction
If the temorature decreased then the reaction eill shift to the exothermic reaction
Because of Le Chatelier’s principle what do we know would happen if the pressure changes in an equilibrium?
Only effetcing gases
If preasure increases it moves to where there are fewer moles
Of pressure decreases the equilibrium tries to increase it by moving it in the direction of where there are more molecules of gas
Because of Le Chatelier’s principle what do we know would happen if the consentration changes in an equilibrium?
If the consentration of the reactant increases tries to decrease it by making more products
If the consentration of the product decreases the system tries to increase it again by reducing the amount of products
