Chemical Reactions The 5 Basic Classifications SYNTHESIS n

Chemical Reactions The 5 Basic Classifications

SYNTHESIS n A reaction in which two or more reactants yield a single product. n Also called composition or combination n General Equation A + B AB EX: 2 Li + Se ---> Li 2 Se n

Decomposition Reaction One Reactant Breaking Down into two or more products General Equation AB ---> A + B Example: 2 Hg. O 2 Hg + O 2

Single Replacement n n Sometimes called Displacement One element replaces a similar element in a compound A + BX AX + B 2 Na + 2 HOH ----> 2 Na. OH + H 2

Double Replacement n Reaction that has the interchanging of two ions from two different compounds. n general form: AB + CD----> AD + CB n Example: Pb(NO 3)2 + 2 KI ----> Pb. I 2 + 2 KNO 3

Double Replacement n Equation consists of two reactants that have both a cation and anion. n During a reaction the cations (or anions) switch places. n The products usually consist of a precipitate.

What Is Combustion? One or more reactants combine with oxygen releasing heat or light Any combustion reaction must include the reactant oxygen, O 2 General Equation: Cm. Hn + O 2 CO 2 + H 2 O Example: CH 4(g) + 2 O 2(g) CO 2(g) +2 H 20

Reaction Checklist n 1) Is O 2 a reactant? (combustion) n 2) One product? (synthesis) n 3) One reactant? (decomposition) n 4) Is an element being replaced? (single) n 5) 2 switches? (double) NEXT WEEK: STOICHIOMETRY!!!!