The Rate And Extent If Chemical Changes Flashcards
What can the rate of a chemical reaction be found by measuring
quantity of a reactant used or the quantity of product formed over time:
What are the factors which can affect the rate of chem Reactions
-pressure
-surface area
-catalyst
-concentration
-temp
What is collision theory
various factors affect rates of reactions.
According to collision theory when can chemical reactions only occur
when reacting particles collide with each other with sufficient energy.
What happens when u inc teh concentration of reactants in a solution
pressure of reacting gases + surface area of solid reactants inc and freq of sucessful collisions inc also inc the rate of reaction.
What happens when inc the temp ina chemical reactions
inc of freq of successful collisions + makes collisions more energetic, and so a inc of the rate of reaction.
Are catalyst used up during the reaction
Nah
What do catalyst do
changes the rate of chemical reactions but are not used up during the reaction.
Do diff reactions need diff catalysts
Yes
What do catalyst inc
inc the rate of reaction by providing a different pathway for the reaction that has a lower activation energy.
Define a reversible reaction
products can react to produce the original reactants
How can equilibrium be reached
When a reversible reaction occurs in apparatus which prevents
escape of reactants and products, equilibrium is reached when the forward and reverse reactions occur at exactly the same rate.
If a system is at equilibrium and a change is made to any of the conditions,then what happens
system responds to counteract the change.
If the concentration of one of the reactants or products is changed,what happens
system is no longer at equilibrium and the concentrations of all the substances will change until equilibrium is reached again.
If the concentration of a reactant is increased,what happens
more products will be formed until equilibrium is reached again.
