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

Classifying Chemical Reactions

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

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

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

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

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

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

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

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