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Unformatted text preview: CHEMICAL REACTIONS CHEMICAL Chapter 4 Chemical Equations Depict the kind of reactants and 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 Chemical Equations 4 Al(s) + 3 O2(g) ---> 2 Al2O3(s) This equation means 4 Al atoms + 3 O 2 molecules molecules ---give---> 2 molecules of Al 2O3 4 moles of Al + 3 moles of O 2 ---give---> 2 moles of Al2O3 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 Conservation of Matter Chemical Equations Because of the principle of the conservation of matter , an equation equation Balancing Equations ___ Al(s) + ___ Br 2(liq) ---> ___ Al 2Br6 (s) liq) must be balanced. It must have the same number of atoms of the same kind on both sides. Lavoisier, 1788 Lavoisier, 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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