1. Types of Chemical Reactions

2. Chemical Reactions
A chemical reaction is a process in which one or more reactants change to make one or more products. **

3. Evidence of Chemical Reactions
Flammability ** **
Change of Color ** **
Precipitate ** **
Gas Production

4. Synthesis Reactions
A chemical reaction in which two or more substances react to form a single substance.
A + B AB
H2 + O H2O2

5. Decomposition Reactions
A chemical reaction in which one compound breaks down to form two or more simpler substances.
AB A + B
CO C + O2

6. Single-Replacement Reactions
A chemical reaction in which one element takes the place of another element in a compound.
A + BC AB + C
Zn + H2SO ZnSO4 + H2

7. Double-Replacement Reactions
A chemical reaction in which two compounds exchange positive ions and form two new compounds.
AB + CD AD + CB
CaCO3 + 2HCl CaCl2 + H2CO3

8. Combustion Reactions
A chemical reaction in a substance reacts rapidly with oxygen often producing heat and light. Usually include the elements
C, H, and O and produce water.
CH4 + 2O CO2 + 2H2O

9. Energy & Reactions
The energy stored in the chemical bonds of a substance: chemical energy Reactions involve breaking chemical bonds in the reactants and forming chemical bonds in the products.

10. Energy & Reactions
By comparing the chemical energy of the reactants with the chemical energy of the products you can determine if energy (heat or light) is released or absorbed.
Exothermic – Energy Released
Endothermic – Energy Absorbed

11. (without being permanently changed)
Reaction Rates
Some reactions happen to slow.
A catalyst:
Speeds up the chemical reaction rate
Enables the reaction to occur at a lower temperature
(without being permanently changed)