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Unit 7

Unit 7. Chemical Reactions. Chemical Equations. Reactants  Products. FeO 2 (s) + 2 H 2 (g )  Fe (s) + 2 H 2 O (l). NaCl ( aq ) + AgNO 3 ( aq )  AgCl (s) + NaNO 3 ( aq ). Chemical Equations.

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Unit 7

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  1. Unit 7 Chemical Reactions

  2. Chemical Equations Reactants  Products FeO2 (s) + 2 H2(g)  Fe (s) + 2 H2O (l) NaCl (aq) + AgNO3 (aq)  AgCl (s) + NaNO3 (aq)

  3. Chemical Equations A chemical equation is a representation for a chemical reaction that uses chemical symbols and chemical formulas instead of words to describe the change that occurs in a chemical reaction. Reactants Products Mg + Cl2 MgCl2 2 Mg + O2 MgO Conservation of Matter! Remember that atoms cannot be created or destroyed!

  4. Balancing Chemical Equations Remember that atoms cannot be created or destroyed! Fe3O4 + H2 Fe + H2O CH4 + O2 CO2 + H2O SCl2+ NaF SF4+ S2Cl2 + NaCl Ca+ N2 Ca3N2 C4H10+ O2 CO2 + H2O NH4NO3 N2+ O2+ H2O

  5. Chemical Equations Synthesis Reactions A single product is produced from 2 or more reactants X + Y  Z SO3 + H2O  H2SO4 Decomposition Reactions A single reactant is converted into 2 or more products Z  X + Y H2SO4 SO3+ H2O

  6. Chemical Equations Single Replacement Reactions One element within a compound is replaced with another element XY + ZZY + X H2SO4 + Mg2+ MgSO4 + 2 H+ Double Replacement Reactions 2 compounds switch parts with each other to form two new compounds AB + XY AX + BY MgSO4 + CaCO3 CaSO4+ MgCO3

  7. Chemical Equations Combustion Reactions A substance reacts with O2 (typically with the help of a flame) 2 C4H10+ 13 O2 8 CO2 + 10 H2O

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