Chemical Reactions

Balancing Chemical Equations No formulas were changed! Draw lines in front of each formula to make a space for coefficients One species at a time Make 2 lists of all elements on each sides Count the elements (and recount each time) Use coefficients to balance the elements

Types of Chemical Reactions Precipitation Reactions Two solutions react to form a solid precipitate Oxidation-Reduction (Redox) Reactions Transfer of electrons from one element to another Acid-Base Reactions Neutralization Reactions make a salt and H2O

Types of Chemical Equation Synthesis Reaction Decomposition Reaction Single Replacement Reaction Double Replacement Reaction Combustion Reaction

Synthesis Reaction A + B  AB Two elements react to make a single product

Decomposition Reaction AB  A + B One reactant breaks down into 2 or more products

Single Replacement Reaction AB + C  CB + A AB + D  AD + B One element and one compound react to make a new element and a new compound

Double Replacement Reaction AB + CD  AD + CB Two compounds react and rearrange to make two new compounds

Combustion Reaction A reaction with O2 Hydrocarbon Combustion CxHy + O2  CO2 + H2O Always produces CO2 and H2O as products Combustion & Synthesis H2 + O2  H2O Fe + O2  FeO