Download presentation

Presentation is loading. Please wait.

Published byTobias Craig Modified over 4 years ago

1
Chemical Equilibrium

2
Rate of forward Rx = Rate of reverse Rx As a system approaches equilibrium, both the forward and reverse reactions are occurring.

3
A System at Equilibrium Once equilibrium is achieved… the amount of each reactant and product remains constant

4
Equilibrium In a system at equilibrium both the forward and reverse reactions are being carried out equation written with a double arrow N 2 O 4 (g) 2 NO 2 (g)

5
Equilibrium Which arrow is larger if….. 1) [Reactants] > [Products] Would the theoretical yield by high or low? 2) [Reactants] < [Products] Would the theoretical yield by high or low?

6
Law of Mass Action Rate of any Chemical Reaction is proportional to: 1) Product of the masses of reacting substances AND 2) Mass of each substance raised to the power of the coefficient in a chemical equation

7
Mathematical Relationships in Equilibrium Forward reaction: N 2 O 4 (g) 2 NO 2 (g) Rate law: Rate = k f [N 2 O 4 ]

8
Mathematical Relationships in Equilibrium Reverse reaction: 2 NO 2 (g) N 2 O 4 (g) Rate law: Rate = k r [NO 2 ] 2

9
Mathematical Relationships in Equilibrium At Equilibrium: Rate f = Rate r therefore k f [N 2 O 4 ] = k r [NO 2 ] 2 kfkrkfkr [NO 2 ] 2 [N 2 O 4 ] =

10
Equilibrium Equation Ratio of the rate constants is a constant at that temperature expression becomes K eq = kfkrkfkr [NO 2 ] 2 [N 2 O 4 ] =

11
Equilibrium Expression and Constant For any reaction: aA + bBcC + dD K c = [C] c [D] d [A] a [B] b Equilibrium expression for this reaction Equilibrium Constant

12
What Does the Value of K Mean? If K >> 1 reaction is product-favored; product predominates at equilibrium. If K << 1 reaction is reactant-favored; reactant predominates at equilibrium.

Similar presentations

© 2019 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google