Types_of_Chemical_Reactions - Zn 2 HCl ZnCl 2 H 2 4 Double...

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Chemical reactions Chemical changes are the result of chemical reactions involving a change in substances and a change in  energy.  1. Synthesis reactions . Two or more substances combine to form a new substance.  2H 2  + O 2    2 H 2 O 2. Decomposition reactions . A complex substance breaks down into simpler substances. Synthesis  and decomposition reactions are “opposites.” 2 H 2  2H 2  + O 2 3. Single replacement reactions . A single element replaces another in a compound. 
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Unformatted text preview: Zn + 2 HCl ZnCl 2 + H 2 4. Double replacement reaction . Parts of two compounds switch places to form two new compounds. AgNO 3 + NaCl AgCl + NaNO 3 Energy of chemical reactions 1. Endothermic . Energy is absorbed; that is, energy is required for the reaction to occur. 2. Exothermic . Energy is released; energy stored as chemical bonds is given off....
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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