Free Powerpoint Presentations

Chemical Equilibrium
Page
2

DOWNLOAD

PREVIEW

WATCH ALL SLIDES

For the gas phase reaction:

3H2(g) + N2(g)  2NH3(g)

Slide 12

Heterogeneous Equilibria

Heterogeneous Equilibria

The position of a heterogeneous equilibrium does not depend on the amounts of pure solids or liquids present

Write the equilibrium expression for the reaction:

PCl5(s)  PCl3(l) + Cl2(g)

Pure

solid

Pure

liquid

Slide 13

The Reaction Quotient

The Reaction Quotient

For some time, t, when the system is not at equilibrium, the reaction quotient, Q takes the place of K, the equilibrium constant, in the law of mass action.

jA + kB  lC + mD

Slide 14

Significance of the Reaction Quotient

Significance of the Reaction Quotient

If Q = K, the system is at equilibrium

If Q > K, the system shifts to the left, consuming products and forming reactants until equilibrium is achieved

If Q < K, the system shifts to the right, consuming reactants and forming products until equilibrium is achieved

Slide 15

Solving for Equilibrium Concentration

Solving for Equilibrium Concentration

Consider this reaction at some temperature:

H2O(g) + CO(g)  H2(g) + CO2(g) K = 2.0

Assume you start with 8 molecules of H2O and 6 molecules of CO. How many molecules of H2O, CO, H2, and CO2 are present at equilibrium?

Here, we learn about ICE the most important problem solving technique in the second semester. You will use it for the next 4 chapters!

Slide 16

Solving for Equilibrium Concentration

Solving for Equilibrium Concentration

H2O(g) + CO(g)  H2(g) + CO2(g) K = 2.0

Step #1: We write the law of mass action for the reaction:

Slide 17

Solving for Equilibrium Concentration

Solving for Equilibrium Concentration

H2O(g) + CO(g)  H2(g) + CO2(g)

Step #2: We ICE the problem, beginning with the Initial concentrations

8

6

0

0

-x

-x

+x

+x

8-x

6-x

x

x

Slide 18

Solving for Equilibrium Concentration

Solving for Equilibrium Concentration

Step #3: We plug equilibrium concentrations into our equilibrium expression, and solve for x

H2O(g) + CO(g)  H2(g) + CO2(g)

x = 4

Slide 19

Solving for Equilibrium Concentration

Solving for Equilibrium Concentration

Step #4: Substitute x into our equilibrium concentrations to find the actual concentrations

H2O(g) + CO(g)  H2(g) + CO2(g)

x = 4

Go to page:
 1  2 

Contents

Last added presentations

2010-2019 powerpoint presentations