1. Quiz
Write the balanced formula equation for the following reaction: 1) Solid barium and oxygen gas react to produce solid barium oxide. Write the balanced chemical equations for the following reactions: 2) Gaseous hydrogen chloride reacts with gaseous ammonia to produce solid ammonium chloride. 3) Aqueous lead (II) nitrate reacts with aqueous potassium iodide to produce solid lead (II) iodide and aqueous potassium nitrate

2. Classifying Chemical Reactions

3. Synthesis Reaction
A + B  AB
2Fe(s) + 3Cl2(g)  2FeCl3

4. Combustion Reaction Requires oxygen 2H2(g) + O2(g)  2H2O(g)
CH4(g) + 2O2(g)  CO2(g) + 2H2O(g)

5. Decomposition Reaction
AB  A + B
2NaCl(s)  2Na(s) + Cl2(g)

6. Types of Decomposition Reactions
Binary compounds
Produce two elements
Metal carbonates
Produce metal oxide and carbon dioxide gas
Metal hydroxides
Produce metal oxide and water
Metal chlorates
Produce metal chloride and oxygen
Acids
May produce nonmetal oxide and water

7. Single-Replacement Reaction
A + BX  AX + B
Cu(s) + 2AgNO3(aq)  2Ag(s) + Cu(NO3)2(aq)

8. Replacement Reactions
One element takes the place of a similar element
Metal replaces another metal
Metal replaces hydrogen in water
Metal replaces hydrogen in an acid
Halogens replace

9. Double-Replacement Reaction
AX + BY  AY + BX
KCN(aq) + HBr(aq)  KBr(aq) + HCN(g)

10. Double Replacement Reactions
Formation of precipitate
2KI + Pb(NO3)2 → PbI2(s) + 2KNO3
Formation of gas
FeS + 2HCl → H2S(g) + FeCl2
Formation of water
HCl + NaOH → NaCl + H2O