1. Temperature and Keq
Lesson # 11

2. 1. PBr3(g) + Br2(g) ⇋ PBr5(g) + energy
@ 100 oC Keq = @ 200 oC Keq =
Is the reaction endothermic or exothermic?
Temperature increased
Keq decreased
Shifted left
Exothermic

3. 1. The system described by the reaction below is in equilibrium
1. The system described by the reaction below is in equilibrium. [N2O4] is increased. Describe the sequence of changes in the forward and reverse reaction rates until a new equilibrium is attained.
N2O4(g) ⇌ 2NO2(g)

4. 1. The system described by the reaction below is in equilibrium
1. The system described by the reaction below is in equilibrium. [N2O4] is increased. Describe the sequence of changes in the forward and reverse reaction rates until a new equilibrium is attained.
N2O4(g) ⇌ 2NO2(g)

5. 1. The system described by the reaction below is in equilibrium
1. The system described by the reaction below is in equilibrium. [N2O4] is increased. Describe the sequence of changes in the forward and reverse reaction rates until a new equilibrium is attained.
N2O4(g) ⇌ 2NO2(g)

6. Forward Rate Reverse RateI
increases
no change C
decreases
increased E
increases
increased

7. 2. [NO2] is decreased. Describe the sequence of changes in the
2. [NO2] is decreased. Describe the sequence of changes in the forward and reverse reaction rates until a new equilibrium is attained.
N2O4(g) ⇌ NO2(g)
Forward Rate Reverse Rate I
no change
decrease C
decreases
increases E
decreases
decreases

8. 3. Temperature is increased
3. Temperature is increased. Describe the sequence of changes in the forward and reverse reaction rates until a new equilibrium is attained.
Energy N2O4(g) ⇌ 2NO2(g)
Forward Rate Reverse Rate I
increase
by more
increase C
decreases
increases E
increases
increases