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					Ch. 7 - Chemical Reactions


  IV. Energy & Chemical
        Reactions
           Energy Changes
           Exothermic Reactions

           Endothermic Reactions
A. Energy Changes       Shockwave
                        applet

 During a chemical reaction…
   energy is used to break bonds
   energy is released when new
    bonds are formed


    breaking            making
     bonds              bonds
  B. Exothermic Reaction         applet

   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
                                    movie
 C. Endothermic Reaction            movie


  reaction   that absorbs energy
                               movie
  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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posted:7/17/2011
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Jun Wang Jun Wang Dr
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