Chemistry Types of Reactions

  1. Single Replacement

one element takes the place of another element in a compound

a + bc → b + ac

(a and b are elements, AX and BX are ionic compounds)

Ca + FeCl2 → CaCl2 + Fe

  1. Double Replacement

the positive parts of 2 ionic compounds are exchanged

ab + cd → ad + cb

AgNO3 + NaCl → AgCl + NaNO3

  1. Decomposition

starts with one molecule, ends with 2 or more (1 molecule broken down to 2+)

AB → A + B

2H2O → 2H2 + O2

  1. Synthesis/Combination

start with 2+ molecules, ends up with one

A+B → AB

2H2 + O2 → 2H2O

  1. Combustion

exothermic reactions in which oxygen combines with elements in organic compounds producing CO2 and H2O

CxHy + O2 → CO2 + H20

CH4 + 2O2 → CO2 + 2H2O + ENERGY