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Ch. 16 - Chemical Reactions IV. Energy & Chemical Reactions n Energy Changes n Exothermic Reactions n Endothermic Reactions.

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Presentation on theme: "Ch. 16 - Chemical Reactions IV. Energy & Chemical Reactions n Energy Changes n Exothermic Reactions n Endothermic Reactions."— Presentation transcript:

1 Ch Chemical Reactions IV. Energy & Chemical Reactions n Energy Changes n Exothermic Reactions n Endothermic Reactions

2 A. Energy Changes n During a chemical reaction… energy is used to break bonds energy is released when new bonds are formed breaking bonds making bonds

3 B. Exothermic Reaction n reaction that releases energy n energy released by making new bonds outweighs energy reqd to break old bonds H 2 (l) + O 2 (l) H 2 O(g) + energy reaction that powers the space shuttle lift-off

4 C. Endothermic Reaction n reaction that absorbs energy n energy reqd to break old bonds outweighs energy released by making new bonds process used to obtain aluminum from aluminum ore 2Al 2 O 3 + energy 4Al + 3O 2


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