Stoichiometry - Stoichiometry: Chemical Formulas and...

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Stoichiometry: Chemical Formulas and Equations Chemical equations What happens to matter when it undergoes chemical changes? The law of conservation of mass : Atoms are neither created, nor distroyed, during any chemical reaction Thus, the same collection of atoms is present after a reaction as before the reaction. The changes that occur during a reaction just involve the rearrangement of atoms. In this section we will discuss stoichiometry (the "measurement of elements"). Chemical equations Chemical reactions are represented on paper by chemical equations . For example, hydrogen gas (H 2 ) can react (burn) with oxygen gas (O 2 ) to form water (H 2 0). The chemical equation for this reaction is written as: The '+' is read as 'reacts with' and the arrow '' means 'produces'. The chemical formulas on the left represent the starting substances, called reactants . The substances produced by the reaction are shown on the right , and are called products . The numbers in front of the formulas are called
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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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Stoichiometry - Stoichiometry: Chemical Formulas and...

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