Lecture 18- Equilibrium 1

Question 1

Completion reaction

Answer 1

• Some reactions go to completion

- All of the reactants are used up, as they all turn into products

Question 2

Dynamic equilibrium

Answer 2

• Most reactions do not go to completion
• All of the reactants do not get used up
• The system reaches a dynamic state where reactants are continually turning into products, and products are continually turning back into reactants
• 2 way arrow

Question 3

Chemical equilibrium

Answer 3

• Forward and reverse reactions continue to take place
• The rate of the forward reaction equals the rate of the reverse reaction
• Concentrations of all species remain constant, yet will rarely be equal to one another
• Takes place in a closed system

Question 4

Keq

Answer 4

• Products/reactants
• [In brackets]
• coefficients are powers
• include gases and aqueous
• take out liquids and solids

Question 5

Kp

Answer 5

• Pressure constant
• Products/reactants
• (In parenthesis)
• coefficients are powers

Question 6

Partial pressure

Answer 6

• The partial pressure of a gas in a system is the pressure exerted by that specific gas
• The partial pressure of all the gases in the system sum up to the total pressure in that system
• 1 mole of one type of gas will exert the same pressure as 1 mole of a different type of gas, under the same conditions of volume and temperature
• 2 moles of gas will exert twice as much pressure

Question 7

Conversions between Kc and Kp

Answer 7

Kp=Kc(RT)^n

• R=0.0821 Latm/mol K
• T= temperature in Kelvin
• n= moles of products - moles or reactants
• Given Kc asked to find Kp or vice versa

Question 8

What Keq tells us

Answer 8

• Keq > 10 = mostly products, equilibrium to the right

- Keq

Question 9

ICE

Answer 9

• Put in values

- Solve for x

Question 10

c to k

Answer 10

+273

Question 11

Writing Kc for pressure

Answer 11

don’t forget p