1. Chemical Rxns-Limiting Reagents & Types of Rxns
Today you will learn:
How much a rxn produces
The 5 types of reactions

2. Imagine…(don’t write this!)
If you bought a kit to build a car, what happens if you don’t have enough bolts and screws?
If you build a bookcase out of wood, what do you do with the extra pieces?

3. I. How much does a reaction produce?
A. During a chemical reaction, the completeness of the reaction is dependant on the amount of the reactants and the product lost in the process.

4. Chemical Reactions
Many times, there is an excess amount of one of the reactants and the other reactant is completely used up.

5. Chemical Reactions (cont)
The limiting reagent is the substance that is used up first.

6. II. Types of Chemical Reactions
Combustion- where an organic compound (CxHyOz) react with O2 to form oxide compounds.
C2H5OH + O2  CO2 + H2O + Energy
1. Highly exothermic: light, sound, heat is produced.

7. Types of Reactions
Synthesis-Simple substances form into complex substances.
CO2 + H2O  C6H12O6 + O2
simple complex

8. Types of Reactions
C. Decomposition-A compound is broken down into simpler substances.
CH3OH  CO + H2
complex simple

9. Types of Reactions
D. Single Displacement- One atom leaves a compound to join with another atom to form a compound.
K + HCl  KCl + H2

10. Types of Reactions
Double Replacement-Both compounds break apart to become two new compounds.
KCl + Na(OH)  NaCl + K(OH)