Temperature and Keq Lesson # 11

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# Temperature and Keq Lesson # 11 - PowerPoint PPT Presentation

Temperature and Keq Lesson # 11. 1. PBr 3(g) + Br 2(g) ⇋ PBr 5(g) + energy. @ 100 o C Keq = 0.17 @ 200 o C Keq = 0.091. Is the reaction endothermic or exothermic?. Temperature increased. K eq decreased. Shifted left. Exothermic.

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1. PBr3(g) + Br2(g)⇋ PBr5(g) + energy

@ 100 oC Keq = 0.17 @ 200 oC Keq = 0.091

Is the reaction endothermic or exothermic?

Temperatureincreased

Keq decreased

Shifted left

Exothermic

1. The system described by the reaction below is in equilibrium. [N2O4] is increased. Describe the sequence of changes in the forward and reversereaction rates until a new equilibrium is attained.

N2O4(g)⇌ 2NO2(g)

1. The system described by the reaction below is in equilibrium. [N2O4] is increased. Describe the sequence of changes in the forward and reversereaction rates until a new equilibrium is attained.

N2O4(g)⇌ 2NO2(g)

1. The system described by the reaction below is in equilibrium. [N2O4] is increased. Describe the sequence of changes in the forward and reversereaction rates until a new equilibrium is attained.

N2O4(g)⇌ 2NO2(g)

Forward Rate Reverse Rate

I

increases

no change

C

decreases

increased

E

increases

increased

2. [NO2] is decreased. Describe the sequence of changes in the forward and reverse reaction rates until a new equilibrium is attained.

N2O4(g)⇌ 2NO2(g)

Forward Rate Reverse Rate

I

no change

decrease

C

increases

decreases

E

decreases

decreases

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

increases

decreases

E

increases

increases