Reactant Types

Today in class, we went over the homework from last night. Then, we talked about reactant types. There are five different types of reactants:

Shown using variables:

1. Synthesis(combination)= A+B ->AB

2. Decomposition= AB ->A+B

3. Single Replacement= A+BC->B+AC

**A must be more reactive than the element it is replacing (In this case it is B).

4. Double Replacement= AB+CD->AD+BC

5. Combustion= C6H12+O->6CO2+6H2O

** Combustion works with hydrocarbons. It will ALWAYS produce CO2+H2O.

Shown using formulas:

1. Synthesis: 2Mg+O2->2MgO

2. Decomposition: 2H2O->2H2+O2

3. Single Replacement: Cu+2AgNO3->2Ag+Cu(NO3)2

** If the element is less reactive than the element it is replacing, there will be no reaction.

4. Double Replacement: Pb(NO3)2+K2S->PbS+2KNO3

5. Combustion: C4H10+6.5O2->4CO2+5H20

Homework tonight is page 18. Don't forget!