Post on 31-Dec-2015
Describing Chemical Reactions
Evidence of a chemical change… Production of heat and light Formation of a gas Formation of a precipitate, a solid
product. Color change
A. Combination / Synthesis (marriage) the combination of 2 or more
substances to form a compound
only one product
A + B AB
B. Decomposition (divorce)
a compound breaks down into 2 or more simpler substances
only one reactant
AB A + B
C. Single Replacement (affair) one element replaces another in a
compound Metal replaces metal Nonmetal replaces nonmetal
A + BC B + AC
AB + CD AD + CB
D. Double Replacement (Jerry Springer)
ions in two compounds “change partners” cation of one compound combines with
anion of the other
Pb(NO3)2(aq)+ NaI(aq) PbI2(s)+ NaNO3(aq)
D. Double Replacement
Products: Are compounds Sometimes one of the products is water
E. Combustion
Products:
During complete combustion theproducts are CO2 + H2O
C12H22O11 + 3O2 9C + 3CO2 + H2O