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Chapter 9 Chemical Equilibrium. 9.2 Chemical Equilibrium. Reversible Reactions. In a reversible reaction , there are both forward and reverse reactions. Suppose SO 2 and O 2 are present initially. As they collide, the forward reaction begins.

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chapter 9 chemical equilibrium
Chapter 9 Chemical Equilibrium

9.2Chemical Equilibrium

reversible reactions
Reversible Reactions

In a reversible reaction, there are both forward and

reverse reactions.

  • Suppose SO2 and O2 are present initially. As they collide, the forward reaction begins.

2SO2(g) + O2(g) 2SO3(g)

  • As SO3 molecules form, they also collide in the reverse reaction that forms reactants. This reversible reaction is written with a double arrow.

forward

2SO2(g) + O2(g) 2SO3(g)

reverse

chemical equilibrium
Chemical Equilibrium

At equilibrium,

  • the rate of the forward reaction becomes equal to the rate of the reverse reaction
  • the forward and reverse reactions continue at equal rates in both directions
chemical equilibrium continued
Chemical Equilibrium (continued)

When equilibrium is reached,

  • there is no further change in the amounts of reactant and product
equilibrium
Equilibrium

At equilibrium,

  • the forward reaction of N2 and O2 forms NO
  • the reverse reaction of 2NO forms N2 and O2
  • the amounts of N2, O2, and NO remain constant

N2(g) + O2(g) 2NO(g)

learning check
Learning Check

Write the forward and reverse reactions for the following:

CH4(g) + 2H2S(g) CS2(g) + 4H2(g)

solution
Solution

Write the forward and reverse reactions for the following:

Forward:

CH4(g) + 2H2S(g) CS2(g) + 4H2(g)

Reverse:

CS2(g) + 4H2(g) CH4(g) + 2H2S(g)

or

CH4(g) + 2H2S(g) CS2(g) + 4H2(g)

learning check1
Learning Check

Complete with

1) equal 2) not equal 3) forward

4) reverse 5) changes 6) does not change

A. Reactants form products in the ________ reaction.

B. At equilibrium, the reactant concentration _______.

C. When products form reactants, it is the _______ reaction.

D. At equilibrium, the rate of the forward reaction is ______ to the rate of the reverse reaction.

E. If the forward reaction is faster than the reverse, the amount of products ________.

solution1
Solution

A. Reactants proceed in the (3) forward reaction.

B. At equilibrium, the reactant concentration (6) does not change.

C. When products form reactants, it is the (4) reverse reaction.

D. At equilibrium, the rate of the forward reaction is

(1) equal to the rate of the reverse reaction.

E. If the forward reaction is faster than the reverse, the amount of products (5) changes.

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