Rates of Reactions
Equilibrium
Le Chatelier's Principle
Vocabulary
Potpourri
100
Define a Rate of a Chemical Reaction
The speed at which products are formed per some unit of time
100
The rates of the forward and reverse reaction are ________ at equilibrium
The same
100
N2 + 3H2 <--> 2NH3 + heat. Which way does the system shift when N2 is added?
To the right
100
The average kinetic energy of a substance, this controls particle movement speed
Temperature
100
Where electrons are located in the atom?
The electron cloud
200
If concentration is increased the rate of the chemical reaction will...
Increase!
200
The forward and reverse reactions have stopped at equilibrium, true or false?
False
200
N2 + 3H2 <--> 2NH3 + heat. Which way does the system shift when NH3 is removed?
To the right
200
The amount of a substance per some amount of volume
Concentration
200
BE CAREFUL: N2 + 3H2 <--> 2NH3 + heat. What direction will the reaction shift (forward or reverse) if we increase the concentration of NH3?
It will shift reverse (left) to relieve the stress.
300
Decreasing the temperature ______________ the rate of the reaction
Decreases
300
The concentrations of reactants and products are ________ at equilibrium
Constant
300
Define Le Chatelier's Principle
A system shifts to reduce change
300
A substance that increases the rate of a reaction without being used up!
A Catalyst
300
If a chemical system is at equilibrium, any change in the system will always result in an increase of which of the following?
The reaction that opposes the change
400
Decreasing the particle size increases the _____________ which increases the rate of a reaction
Surface Area
400
Define Equilibrium
When the forward and reverse reaction are occurring at the same time and same rate.
400
N2 + 3H2 <--> 2NH3 + heat. What happens to the concentration of [NH3] when heat is added to the system?
The concentration decreases
400
The amount of energy needed for a reaction to occur
Activation Energy
400
A An increase in the concentration of W or Y will increase the rate of the reverse reaction.
B An increase in the concentration of X or Z will increase the rate of the reverse reaction.
C An increase in the concentration of W or X will increase the rate of the reverse reaction.
D An increase in the concentration of Y or Z will increase the rate of the reverse reaction. 
D. An increase in the concentration of Y or Z will increase the rate of the reverse reaction.
There is more product that can break down to reform reactant! it Has to shift left (reverse).
500
Catalysts reduce the rate of a chemical reaction by...
Decreasing the activation energy
500
Draw a graph of concentration (y) vs time (x) for a system that has reached equilibrium
Mr. Regester will draw on the board!
500
N2 + 3H2 <--> 2NH3 + heat. What happens to the concentration of[N2] when the pressure is decreased?
It increases
500
A biological catalyst
An Enzyme
500
Given a reversible reaction that contains gasses, If you increase the pressure which side will be favored (increase in concentrations)? (products or reactants)
The side with fewer molecules or moles of gas.
Increasing the pressure gives the reaction less space and forces molecules to collide together--increasing the side with stuff that has been combined together in fewer molecules.