Exothermic vs. Endothermic. Decomposition of Nitrogen Triiodide.
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Transcript of Exothermic vs. Endothermic. Decomposition of Nitrogen Triiodide.
Decomposition of Nitrogen Triiodide
Decomposition of Nitrogen Triiodide
2 NI3(s) N2(g) + 3 I2(g)
NI3 I2
N2
Exothermic ReactionReactants Products + Energy 10 energy = 8 energy + 2 energy
Reactants
Products
-H
Ene
rgy
Energy of reactants
Energy of products
Reaction Progress
Endothermic Reaction
Energy + Reactants Products
+H Endothermic
Reaction progress
Ene
rgy
Reactants
ProductsActivation Energy
Effect of Catalyst on Reaction Rate
reactants
products
Ene
rgy
activation energy for catalyzed reaction
Reaction Progress
No catalyst
Catalyst lowers the activation energy for the reaction.What is a catalyst? What does it do during a chemical reaction?
An Energy Diagram
activatedcomplex
activationenergyEa
reactants
products
course of reaction
ener
gy
Animation by Raymond ChangAll rights reserved
Energy Sources in the United States
Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 307
Wood Coal Petroleum / natural gas Hydro and nuclear
1850 1900 1940 1980 1990
100
80
60
40
20
0
Per
cent
9
91
21
71
5 310
50
40
20
70
10
26
58
16
Energy Sources in the United States
Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 307
Wood Coal Petroleum / natural gas Hydro and nuclear
1850
100
80
60
40
20
0
Per
cent
9
91
1900
21
71
5 3
1940
10
50
40
1980
20
70
10
1990
26
58
16
Energy Sources in the United States
Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 307
Wood Coal Petroleum / natural gas Hydro and nuclear
1850
100
80
60
40
20
0
Per
cent
9
91
1900
21
71
5 3
1940
10
50
40
1980
20
70
10
1990
26
58
16
2005
50
21 26
Energy Conversion
Timberlake, Chemistry 7th Edition, page 202
fanelectrical energy tomechanical energy
light bulbelectrical energy to
light energy tothermal and radiant energy
coffee makerelectrical energy to
thermal energy
pencil sharpenerelectrical energy tomechanical energy
