C6 Flashcards
how do we calculate mean rate of reaction
quality of product formed(or reactant used)/
time taken
how do we use a tangent to determine rate of reaction
make tangent,make triangle,find values x and y ,y/x
what is the collision theory
-chemical reactions can only take place when the reacting particles collide with each other
-the collisions must have sufficient energy
how does concentration effect rate of reaction
that rate of reaction is proportional to concentration
what is frequency
the number of successfu collisions per second
how does the surface area effect rate of reaction of a solid reactant
the rate of reaction increases when we increase the surface area due to their being more successful collisions
what is activation energy
the minimum amount of energy that particles must have in order to react
what is the effect of temperature on chemical reaction
-increasing temperature increases rate of reaction as it increases energy and therefore there are more successful collisions
-rate of reaction is proportional to temperature
what are catalysts
catalysts increase the rate of reaction but are not used up during the reaction
why are catalysts beneficial
allow us to carry out reactions without having to increase temperature,saving money
-can be reused
how do catalysts increase rate of reaction
catalysts increase rate of reaction by providing a different pathway for the reaction that has lower activation energy
why do we not include catalysts in chemical reaction equation
because they are not used up they are not a reactant
do all reactions need the same catalyst
-no
-different reactions require different catalysts
what do enzymes act as in living organisms
enzymes act as catalysts in living organisms
what is a reversible reaction
a reaction in which the products can react to reform the original reactants
how can we change the direction of reversible reactions
-changing the conditions
what is the energy like in reversible reactions
if a reversible reaction is exothermic in one direction the other in endothermic
-same amount of energy is required in each case
what is equilibrium
the point where the forward and reverse reactions will take place at the exact same rate
what is the effect of changing conditions on equilibrium
if a system is at equilibrium and a change is made to the conditions then the system responds to counter act the change
(chatelier’s principle
what is the effect of changing pressure at equilibrium
-if we increase pressure at equilibrium the position of equilibrium shifts to side with smaller number of molecules
