Lec6 - Chapter 3 Chemical Reactions and Earths Composition...

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1 Chapter 3 Chemical Reactions and Earth’s Composition The Composition of Compounds The law of definite proportions states that a specific chemical compound obtained from any source always contains the same proportion by mass of its elements. H + + OH - ---> H 2 O (2:16) 2 H 2 + O 2 ---> 2 H 2 O (2:16) This means that compounds are not simple mixtures ± Isotopes can vary this somewhat ± Doesn’t apply to many polymers
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2 Chemical Equations Transformation of a Set of Substances to another Set ± Recipe for change is a chemical equation ± Reactants Products Chemical Reactions rearrange Atoms Some Reactions are named ± Example: a combustion reaction Can’t easily measure individual particles ± Connect atomic and laboratory scales Chemical Reactions
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3 Dimensional Analysis ; unit conversion Most numbers have associated UNITS Salary=16. ± Is that dollars/hour, or thousands of dollars per year?? ± Or pesos/yen/pennies???
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This note was uploaded on 09/23/2010 for the course CHEM 131 taught by Professor Wong during the Fall '08 term at SUNY Stony Brook.

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Lec6 - Chapter 3 Chemical Reactions and Earths Composition...

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