Chapter 4 - Chemical Equations Depict the kind of reactants...

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Chemical Equations Depict the kind of reactants and products and their relative amounts in a reaction. 4 Al(s) + 3 O2(g) ---> 2 Al2O3(s) The numbers in the front are called stoichiometric coefficients The letters (s), (g), and (l) are the physical states of compounds.
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Chemical Equations 4 Al (s) + 3 O2 (g) 2 Al 2 O 3 (s) This equation means: 4 Al atoms + 3 O 2 molecules ---give---> 2 molecules of Al 2 O 3 or 4 moles of Al + 3 moles of O 2 ---give---> 2 moles of Al 2 O 3 • Because the same atoms are present in a reaction at the beginning and at the end, the amount of matter in a system does not change. This is The Law of the Conservation of Matter
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Because of the principle of the conservation of matter, an equation must be balanced. It must have the same number of atoms of the same kind on both sides. Chemical Equations Lavoisier, 1788
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___ Al (s) + ___ Br 2 (liq) ---> ___ Al 2 Br 6 (s) Balancing Equations ____C 3 H 8 (g) + _____ O 2 (g) _____CO 2 (g) + _____ H 2 O (g) ____B 4 H 10 (g) + _____ O 2 (g) ___ B 2 O 3 (g) + _____ H 2 O (g)
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the study of the quantitative aspects of chemical reactions. It rests on the principle of the conservation of matter. STOICHIOMETRY 2 Al(s) + 3 Br 2 (liq) Al 2 Br 6 (s)
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2 Al(s) + 3 Br 2 (liq) Al 2 Br 6 (s) What does this mean??? 2 mol of Al and 3 mol of Br
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This note was uploaded on 11/18/2010 for the course CHEMISTRY 4317 taught by Professor Cunycsichemistrydepartment during the Fall '08 term at Staten Island.

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Chapter 4 - Chemical Equations Depict the kind of reactants...

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