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    Catalysts: Paul Andersen explains how catalysts can speed up a reaction without being consumed in the reaction. Catalysts can lower the activation energy of reaction be stabilizing the transition state. They can also create new reaction pathways with new reaction intermediates that lower the overall activation energy.

    The Rate-Limiting Step: In this video Paul Andersen explains why the slowest elementary step in a chemical reaction is the rate-limiting step. This step can be used to determine the overall rate law of the chemical reaction.

    Chemistry - How to Balance Chemical Equations

    Chemical changes vs. Physical changes. The video shows different examples of physical and chemical changes.

    chemical reaction chart .. HAHAHAHAHA! i think i'm going to use this for next year.

    The process by which one or more substances change to produce one or more different substances.

    Chemistry Lab: Types Of Chemical Reactions. The purpose of this lab is: 1) To observe some chemical reactions and identify reactants and products of those reactions. 2) To classify the reactions and write balanced equations. $

    A chemistry unit study with LEGOS as models. Free teacher guide, lesson plans, worksheets at link.

    Teach kids about chemical reactions with FamilyFun magazine's home crystal-growing experiment!