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 1. Increase 2. Decrease 3. Stay the same

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

4. Symbols slgaq yields, reacts to form reversible reaction heat is added solidliquidgas aqueous (dissolved in water)

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

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

7. Balancing Equations using Atom Inventory Zn + HBr  ZnBr 2 + H 2 ZnHBr111122 Is everthing balanced? 2 2 2 Balanced!!

8. Leave Polyatomic ions together AgNO 3 + Na 2 S  Ag 2 S + NaNO 3 AgSNa NO 3 11212111 2 2 2 Is everthing balanced? 2 2 2 Balanced!!

9. Never change subscripts Al 2 (SO 4 ) 3 + HCl  H 2 SO 4 + AlCl 3 Al SO 4 HCl23111123 Is everthing balanced? 2 6 2 6 6 6 3 6 3 Balanced!!

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