Types of Chemical Reactions Synthesis Decomposition Reactions 5

Types of Chemical Reactions Synthesis & Decomposition Reactions

5 types of reactions: Synthesis n Decomposition n Single Replacement n Double Replacement n Combustion n

Synthesis Reactions n the combination of 2 or more substances to form a single compound n only one product A + B AB

Synthesis Reactions

Synthesis Rxns n How can you determine the products of a synthesis reaction? ¨ ionic - cancel charges ¨ covalent - hard to tell 2 Al(s)+ 3 Cl 2(g) 2 Al. Cl 3(s)

Products of Synthesis Rxns n Group A metal + nonmetal ionic compound 2 K(s) + Cl 2(g) 2 KCl(s) n Transition metal + nonmetals ionic compound Fe(s) + S(s) Fe. S(s) Fe(s) + S(s) Fe 2 S 3(s)

Products of Synthesis Rxns + nonmetal molecular compound S(s) + O 2 (g) SO 2 (g) n. Nonmetal

Products of Synthesis Rxns oxides + water acid SO 2(g) + H 2 O(l) H 2 SO 3(aq) n. Nonmetal n. Metallic oxides + water base Ca. O(s) + H 2 O(l) Ca(OH)2(aq)

Synthesis Example Problems n Predict the products of the following rxns: 1) Al(s) + O 2(g) Al 2 O 3(s) 2) SO 3 + H 2 O(l) H 2 SO 4(aq) 3) Cu(s) + S(s) Cu. S (s) or Cu 2 S (s) 4) Mg. O(s) + H 2 O 5) Ba(s) + S 8(s) Mg(OH)2(s) Ba. S (s)

Decomposition Reactions n a single compound breaks down into 2 or more simpler substances n only one reactant AB A + B

Decomposition Rxns n 2 H 2 O(l) 2 H 2(g) + O 2(g) Require energy ¨ Heat ¨ light ¨ electricity

Decomposition Rxns n Products: ¨ binary - break into elements ¨ others - hard to tell 2 KBr(l) 2 K(s) + Br 2(l)

Decomposition Examples Predict the products of the following rxns: 1) Na. Cl(s) Na (s) + Cl 2 (g) n 2) HI(l) H 2 (g) + I 2 (s) 3) Pb. O 2(s) Pb(s) + O 2 (g)