Predicting Products of Predicting Products of Chemical ReactionsChemical Reactions

Predicting ProductsPredicting ProductsSynthesis Reactions

◦To know you have a synthesis reaction your reactants will be two simple elements/compounds

◦The product will be a compound made of the two reactants

◦Use your ionic bonding formula writing skills to balance charges to write the product formula

Predicting ProductsPredicting ProductsSynthesis Examples:

◦Mg + O2 ?

◦2Mg + O2 2MgO

◦C + H2 ?

◦C + 2H2 CH4

Predicting ProductsPredicting ProductsDecomposition Reactions

◦To know you have a decomposition reaction, you will start with one reactant

◦There will be two products created, usually the component elements but not always

Decomposition Examples◦H2O ?◦2H2O 2H2 + O2

◦H2CO3 ?◦H2CO3 CO2 + H2O

Predicting ProductsPredicting ProductsCombustion Reactions

◦To know you have a combustion, one of your reactants will the oxygen and the other will contain carbon

◦The products will always be carbon dioxide and water! So easy!

Combustion Example◦C4H8 + O2 ?

◦C4H8 + 6O2 4CO2 + 4H2O

Predicting ProductsPredicting ProductsSingle Replacement Reactions

◦You know you have a single replacement, when you have a compound and an element as your reactants

◦Not all single replacement reactions will occur◦Use a metal activity series to determine if a

reaction will occur. To occur, the lone element must be more reactive than the metal in the compound

◦ If it will, cations (metals) will trade places to create the product.

◦Use your ionic formula writing skills to get the new formulas correct

Predicting ProductsPredicting ProductsSingle Replacement Examples

◦Mg + FeCl2 ?

◦Mg is more reactive than Fe, so it will replace Mg

◦Mg + FeCl2 MgCl2 + Fe

◦AlCl3 + Cs ?

◦Cs is more reactive than Al, so it will replace Al

◦AlCl3 + 3Cs 3CsCl + Al

Predicting ProductsPredicting ProductsDouble Replacement Reactions

◦You know you have a double replacement reaction when your reactants are two compounds

◦For this reaction to occur, a solid must be formed as a product

◦For the products, the cations (metals) will “switch partners”

◦Use the solubility rules to determine if one of the products will be a solid

Predict ProductsPredict ProductsDouble Replacement ExamplesNa2CO3 + Ca(NO3)2 ?Predict the products:

◦NaNO3 + CaCO3

Use the Solubility Rules:◦NaNO3 is soluble, but CaCO3 is

insoluble so the reaction will occurReaction:

◦Na2CO3 + Ca(NO3)2 2NaNO3 + CaCO3