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Unformatted text preview: CHEMICAL REACTIONS CHEMICAL Chapter 4 Chemical Equations Depict the kind of reactants and Depict reactants and products and their relative amounts and in a reaction. 4 Al(s) + 3 O2(g) ---> 2 Al 2O3 (s) The numbers in the front are called stoichiometric coefficients The letters (s), (g), and (l) are the physical states of compounds. Reactants: Zn + I2 Product: Zn I2 Chemical Equations • 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. • The Law of the The Law Conservation of Matter Chemical Equations 4 Al(s) + 3 O2(g) (g) ---> 2 Al2O3(s) ---> This equation means 4 Al atoms + 3 O 2 molecules ---give---> 2 molecules of Al 2O3 4 moles of Al + 3 moles of O 2 ---give---> 2 moles of Al2O3 moles Chemical Equations Because of the principle of the conservation of matter , an equation an must be Balancing Equations ___ Al(s) + ___ Br 2(liq) ---> ___ Al 2Br6 (s) balanced. balanced. It must have the same It number of atoms of the same kind on both sides. same Lavoisier, 1788 Balancing Balancing Equations ____C3H8(g) + _____ O 2(g) ----> _____CO2(g) + _____ H 2O(g) ____B4H10(g) + _____ O 2(g) ----> ___ B2O3(g) + _____ H 2O(g) ...
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This note was uploaded on 10/19/2011 for the course CHM 2210 taught by Professor Staff during the Spring '08 term at University of Central Florida.

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