The document discusses four types of special chemical reactions: 1. Gas forming reactions involve a metal carbonate reacting with an acid to form a salt, water, and carbon dioxide gas. 2. Precipitation reactions are double displacement reactions that form an insoluble salt precipitate. 3. Neutralization reactions involve an acid reacting with a base to form a salt and water. 4. Combustion reactions involve the burning of a hydrocarbon with oxygen to produce carbon dioxide and water.

1. SOME SPECIAL REACTIONS

2. SPECIAL REACTION TYPES GAS FORMING RXNs PRECIPITATE RXNs NEUTRALIZATION RXNs COMBUSTION RXNs

3. 1) GAS FORMING RXN Metal carbonate + Acid  Salt + H 2 O (l) + CO 2(g) Example: CaCO 3(s) + 2HCl (aq)  CaCl 2(s) + H 2 O (l) + CO 2(g)

4. 2) PRECIPITATION RXN A double displacement reaction resulting in the formation of an insoluble salt. Example: Pb(NO 3 ) 2(aq) + 2NaI (aq)  PbI 2(s) + 2 NaNO 3(aq) *Use the solubility table to determine if the products are insoluble (form solid), or soluble (in solution).

5. 3) NEUTRALIZATION RXN Acid + Base  Salt + Water Example: HCl (aq) + NaOH (aq)  NaCl (aq) + H 2 O (l)

6. 4) COMBUSTION RXN The rxn of a hydrocarbon w/ oxygen to produce CO 2(g) and H 2 O (l) . Example: CH 4(g) + 2 O 2(g)  CO 2(g) + H 2 O (l)

7. SPECIAL REACTION TYPES 1. GAS FORMING RXNs M(CO 3 ) + Acid  Salt + H 2 0 + CO 2 2. PRECIPITATE RXNs DD Rxn where insoluble salt is formed 3. NEUTRALIZATION RXNs Acid + Base  Salt + Water 4. COMBUSTION RXNs C # H # + O 2  CO 2 + H 2 O