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