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
Fe(s) + Cl2(g)  FeCl3

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

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

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

7. 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
Activity series used to determine if reaction occurs (Figure 12 p 748)

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

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