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Balancing Equations

Balancing Equations. Potassium Iodide and Lead Nitrate are mixed to form a precipitate (solid). After the reaction the mass of the flask will. Increase Decrease Stay the same. Chemical Reactions. Shown by chemical equations 4 Cu (s) + 1 O 2 (g)  2 Cu 2 O (s).

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Balancing Equations

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  1. Balancing Equations

  2. Potassium Iodide and Lead Nitrate are mixed to form a precipitate (solid). After the reaction the mass of the flask will • Increase • Decrease • Stay the same

  3. Chemical Reactions Shown by chemical equations 4 Cu (s) + 1 O2 (g)  2 Cu2O (s) coefficients

  4.  s l g aq yields, reacts to form reversible reaction heat is added solid liquid gas aqueous (dissolved in water) Symbols

  5. Sides? Reactant(s) Product(s) 2Fe + O2 2FeO “Rust”

  6. Why Balance? • To show that the law of conservation of mass is satisfied • To know the proportions the elements and compounds react in

  7. Balancing Equations usingAtom Inventory Zn + HBr  ZnBr2 + H2 2 Balanced!! 1 1 1 Zn H Br 1 2 2 Is everthing balanced? 2 2

  8. Leave Polyatomic ions together AgNO3 + Na2S  Ag2S + NaNO3 2 2 Balanced!! 2 1 1 2 1 Ag S Na NO3 2 1 1 1 Is everthing balanced? 2 2 2

  9. Never change subscripts Al2(SO4)3 + HCl  H2SO4 + AlCl3 6 3 2 2 3 1 1 Al SO4 H Cl 1 1 2 3 2 Balanced!! Is everthing balanced? 3 6 6 6 6

  10. Websites • www.funbasedlearning.com (open with Internet Explorer) • http://education.jlab.org/elementbalancing/index.html • http://science.widener.edu/svb/tutorial/rxnbalancingcsn7.html

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