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Ch. 16 - Chemical Reactions

Ch. 16 - Chemical Reactions. IV. Energy & Chemical Reactions. Energy Changes Exothermic Reactions Endothermic Reactions. A. Energy Changes. During a chemical reaction… energy is used to break bonds energy is released when new bonds are formed. breaking bonds. making bonds.

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Ch. 16 - Chemical Reactions

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

  2. A. Energy Changes • 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 • reaction that releases energy • energy released by making new bonds outweighs energy req’d to break old bonds H2(l) + O2(l)  H2O(g) + energy • reaction that powers the space shuttle lift-off

  4. C. Endothermic Reaction • reaction that absorbs energy • energy req’d to break old bonds outweighs energy released by making new bonds 2Al2O3+ energy 4Al + 3O2 • process used to obtain aluminum from aluminum ore

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