Notes: Monday December 17, 2012

Topic: Types of ReactionsEQ: How can we predict what the products of a reaction are if we know the reactants

and the type of reaction?

Synthesis Reactions

• When reactants combine to make one product• A + B AB• Examples– 2Na + Cl 2NaCl– 8 Fe + S8 8 FeS

– C + O2 → CO2

Decomposition

• Substances are broken apart• AB A + B• Examples– CaCO3 → CaO + CO2

– 2H2O → 2H2 + O2

– H2SO4 → H2O + SO3

Combustion

• An oxidation reaction of an organic compound. Oxygen is always involved.

• Examples– CH4 + 2O2 → CO2 + 2H2O

– 2C4H10 + 13O2 → 8CO2 + 10H2O

• The types of carbon released depends on how much oxygen there is in the reaction. If there is more oxygen in the reaction CO2 is released, if less just C or CO.

Single-Displacement

• A reaction in which one element takes the place of another element in a compound.

• AX + B BX + A• Examples– Cu + 2AgNO3 → 2Ag + Cu(NO3)2

– Fe + Cu(NO3)2 → Fe(NO3)2 + Cu

Double-Displacement

• A reaction where there is an exchange of atoms between two compounds.

• AX + BY AY + BX• Examples:– Na2SO4 + CaCl2 ----> NaCl + CaSO4

– Pb(NO3)2 + KI ----> PbI2 + KNO3