13changes - Physical and Chemical Changes Glenn V Lo Department of Physical Sciences Nicholls State University Physical vs Chemical Change CHEMICAL

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    Physical and Chemical  Changes Glenn V. Lo Department of Physical Sciences Nicholls State University
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    Physical vs. Chemical Change CHEMICAL CHANGE: Transformation of  one or more substances to other  substance(s); “change in composition” A chemical change involves: A decrease in the amount of one or more  substances; “ reactants An increase in the amount of other  substance(s); “ products
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    Reactants and Products A mixture containing water was  subjected to an electrical current  (“electrolysis”).  As a result, it was found  that the amount of water decreased by  18.02 g.  Two gases, hydrogen (2.02 g)  and oxygen (16.00 g) bubbled out of the  mixture. What is the reactant? What are the products?
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  Molecular Interpretation A chemical change  involves a  rearrangement of  atoms; bonds  between atoms are  broken and/or new  bonds are formed. Which of the two pictorial representations of atoms 
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This note was uploaded on 06/11/2009 for the course CHEM 105 taught by Professor Wessel during the Spring '08 term at Nicholls State.

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13changes - Physical and Chemical Changes Glenn V Lo Department of Physical Sciences Nicholls State University Physical vs Chemical Change CHEMICAL

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