Equilibrium

General Equilibrium

1

What is a chemical reaction in which the forward and reverse reactions are at equal rates?

equilibrium

2

What does the symbol ⇌ mean in a chemical equation?

reversible

3

In an equilibrium expression, what do you exclude?

solids and liquids

4

In an equilibrium expression, what goes on the denominator?

What is the reactants

5

Balance the equation CH4+O2→CO2+H2O

1, 2, 1, 2

Le Chatelier

1

If you add more reactants which way does equilibrium shift?

towards products

2

If you remove reactants which way does equilibrium shift?

towards reactants

3

If you increase pressure what is important in determining the direction of equilibrium?

number of moles

4

If you change temperature what is important in determining the direction equilibrium will shift?

exothermic or endothermic

5

What are the 3 stresses?

concentration, temperature, pressure

ICE

1

What does the C stand for in ICE

What is change

2

When do you need an ICE table?

What is when equilibrium concentrations are unknown

3

Initial concentrations for the reactant is 1.00 and for the product is 0. What will be the Change?

-x and +x

4

What do we solve for in ICE table?

equilibrium concentrations 

5

If the reactant has a greater value, where does it shift?

to the right (products)

Kc

1

What does Kc mean

What is equilibrium constant

2

If kc is greater than 1, what does that mean?

products are favored

3

What do we do with the coefficients?

write them as exponents

4

What is the difference between Q and Kc?

Q is at any given moment, Kc is during equilibrium 

5

Steps in writing the Kc expression

1. identify reactants and products

2. put products on numerator and reactants on denominator

3. write coefficients as exponents