Warm-up Balance the following equations: Ca (s) + F2 (g) CaF2 (s) N2 (g) + H2 (g) NH3 (g) Na (s) + H2O (l) NaOH (aq) + H2 (g) C2H6 (g) + O2 (g) CO2 (g) + H2O (l)
Predicting Products: Combustion, Synthesis, and Decomposition Day 3
Combustion So, predicting products is pretty simple. A Carbon containing compound reacts with oxygen. Carbon dioxide and water are always your products! So, predicting products is pretty simple. C6H12O6 + O2 H2O + CO2
Combustion Products will always be CO2 and H2O Look for a carbon containing compound and O2 as a reactants. The only work you have to do is balance the equation correctly.
Synthesis Remember a synthesis reaction is when two substances combine to form a new substance. Couple forms Ex. 4Fe + 3O2 2Fe2O3
Steps for Predicting Products. Figure out the ions (charges) of the reactants. Cross charges to predict product. Write predicted product on products side. Balance equation.
Example Na + Cl2 2Na + Cl2 2NaCl K+Br2 2K+Br2 2KBr Mg + O2 2Mg + O2 2MgO
Decomposition Something breaks apart into individual pieces. Opposite of synthesis reactions. Couple breaks up Ex. 2NaCl 2Na + Cl2
Decomposition You need to know four types Binary Metallic Carbonates Metallic Hydroxides Metallic Chlorates
Binary Decomposition A compound breaks up into its elements AB A + B 2NaCl 2Na + Cl2 Exact opposite of synthesis!
Metallic Carbonates Decompose into the metal oxide and Carbon Dioxide MCO3 MO + CO2 PbCO3 PbO + CO2
Metallic Hydroxides Decompose into the metal oxide and water MOH MO + H2O Pb(OH)2 PbO + H2O
Metallic Chlorates Decompose into the metal chloride and oxygen gas MClO3 MCl + O2 Pb(ClO3)2 PbCl2 + 3O2
Key Things to Remember Determine the type of compound before trying to predict the products!! Use the “Guidelines for Predicting the Products of selected Types of Chemical Reaction” reference sheet
Practice Cu(OH)2 Li + O2 CaCl2 Mg + Cl2
Practice CH4 + O2 CH4 + 2O2 CO2 + 2H2O Cs + F2 2Cs + F2 2CsF Ba + Cl2 Ba + Cl2 BaCl2 C3H8 + O2 C3H8 + 5O2 3CO2 + 4H2O