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5: Chemical Reactions

  • Page ID
    74103
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    • 5.1: Physical and Chemical Changes
      A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not.  In contrast, a chemical property describes the ability of a substance to undergo a specific chemical change.
    • 5.2: Chemical Equations
      Chemical reactions are occurring all around you. Plants use sunlight to drive their photosynthetic process and produce energy. Cars and other vehicles burn gasoline in order to power their engines. Batteries use electrochemical reactions to produce energy and power many everyday devices. Many chemical reactions are going on inside you as well, especially during the digestion of food.
    • 5.3: Organic Reactions
      Organic reactions require the breaking of strong covalent bonds, which takes a considerable input of energy. In order for relatively stable organic molecules to react at a reasonable rate, they often must be modified with the use of highly reactive materials or in the presence of a catalyst. In this lesson, you will learn about several general categories of organic reactions.


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