Show:
Physical Equilibrium
Chemical Equilibrium
Le Chatelier's
Kinetics
Randomness
100
What are two physical phase changes that occur reversibly involving solid and liquid?
Melting and Freezing
100
Chemical Equilibrium is a dynamic process (T/F)
True
100

According to Le Chatelier, what are the 3 "stressors"?

Concentration, Volume/Pressure, and Temperature.

100

A reaction where energy is located on the product side of a chemical reaction

What is an exothermic reaction?


100
Which way will the reaction shift if the concentration of SO3(g) decreases in 2SO2(g)+O2(g)<--->2SO3(g)+heat
Right
200
What are two physical phase changes that occur reversibly involving liquid and gas?
Vaporization and Condensation
200
In order for chemical equilibrium to occur, the concentrations of the products and reactants must equal (T/F)
False
200
In the reaction, A + B <--> C + D, What will happen to the equilibrium if excess D is added to the system?
The reaction will shift towards the reactants in order to consume the excess D added and produce more A and B.
200
Using the equation, 2NO2 (g) <--> N2O4 (g) 2 NO2= .500M N2O4= .025M Calculate Kc.
Kc = .100
200

What are 4 factors that affect the rate of a reaction?

What are catalyst, temperature, surface area, concentration?


300
Equilibrium is a state or condition in which two opposing processes take place at the same rate (T/F)
True
300
What is the role of a catalyst (in terms of equilibrium)?
A catalyst does not affect equilibrium, it only affects the rate.
300
At the end of an equilibrium reaction, the solution is very hot. Explain this reaction in terms of heat (exothermic/endothermic).
In order for the reaction to be hot to the touch at the end of a reaction, heat has to be given off by the system making it exothermic. An exothermic reaction will have heat as its product.
300

What is the effect of a catalyst on the reaction rate?

What is lowers the activation energy, creating a faster pathway for a chemical reaction?


300

What is the effect of increasing the volume of a closed container equivalent to?

Decreasing the pressure.


400
In an equilibrium reaction such as: NaCl(s) <--> Na+(aq) + Cl-(aq); At equilibrium, the rate of dissolving will equal the rate of _________.
Crystallization
400

This is the principle that states a system (rxn) in equilibrium will shift direction to balance any changes that are made.

What is Le Chatelier's Principle


400

Direction of the equilibrium shift when temperature is increased in an exothermic reaction.

What is left?


400

The minimum energy that colliding particles must have in order to react.

What is activation energy?


400
What effect will adding more reactants or decreasing the products result in?
Shift to the right.
500
What does the term MACROSCOPIC change mean?
A change that can be seen with the naked eye (not at the molecular level)
500

This is a reaction that proceeds until one reactant is used up.

What is an irreversible reaction? (not in equilibrium)


500
2SO3(g) + 197 kJ <--> 2SO2(g) + O2(g) In what direction will equilibrium shift if we increase the temperature?
Right
500

As two molecules collide and chemically react, they are thought to form a short-lived, unstable arrangement of atoms called this before breaking apart to form products

What is the activated complex?


500
What is Entropy
the Order/disorder of particle arrangements. (chaotic or random arrangement)  To be judged by teacher.