1. Chemical Reactions
By: Aero1234

2. Chemical Reaction During a chemical reaction atoms are rearranged.
In a chemical reaction the electrons are effected.
Reactants- the starting materials in a chemical reaction
Products- the materials made as a result of the chemical reaction
Reactant +Reactant= Product

3. The Law of Conservation of Mass
The Law of Conversion of Mass says that mass cannot be created or destroyed.
It is related to chemical reactions because the mass of the reactants must equal the mass of the products.

4. Five Signs of a Chemical Reaction
A change in color
A change in temperature
A formation of gas
A formation of precipitation
Energy is produced

5. Energy and Chemical Reactions
In a chemical reaction energy is given off. Energy is needed to start a reaction.
The lowest amount of energy needed to start a reaction is activation energy.
Chemical Potential Energy- The energy in chemical bonds holding the atoms of a compound together.

6. Endothermic and Exothermic
Exothermic Energy- a chemical reaction that produces heat. (Ex. Combustion reactions of fuels )
Endothermic Energy- a chemical reaction that absorbs heat in order to proceed. Temperature drops. (Ex. dissolving ammonium chloride in water )

7. Types of Chemical Reactions
Synthesis
Decomposition
Combustion
Single Replacement
Double Replacement

8. This is a picture of magnesium burning (2Mg + O2 --> 2MgO )
This is a picture of magnesium burning (2Mg + O2 --> 2MgO ). This is an example of a synthesis reaction.
Synthesis
In a synthesis reaction two or simple reactions combine to create a more complex substance ( forms a compound)
Ex 1.) A + B --> AB
Ex 2.) 2Mg + O2 --> 2MgO
e/sciber00/8th/matter/sciber/chemtyp e.htm

9. This is a picture of the decomposition of baking soda (2 NaHCO3 --> NaCO3 + H2O + CO2). This is an example of a decomposition reaction.
Decomposition
A more complex substance is broken down into more simple parts. So basically a compound is split apart.
Ex 1.) AB --> A + B
Ex 2.) 2 NaHCO3 --> NaCO3 + H2O + CO2
ber00/8th/matter/sciber/chemtype.htm

10. This is a picture of magnesium burning (2Mg + O2 --> 2MgO)
This is a picture of magnesium burning (2Mg + O2 --> 2MgO). It is an example of a combustion reaction.
Combustion
A combustion reaction is a complex sequence of an exothermic reaction. It produces light and/ or heat. A combustion reaction involves oxygen. Also it produces heat. It produces so much heat that it creates a flame.
Ex 1.) CxHy + O2 --> CO2 + H2O
Ex 2.) 2Mg + O2 --> 2MgO (exothermic, also synthesis) (picture to the right)

11. This is a picture of aluminum to copper (2 Al + 3 CuCl2 --> 2 AlCl3 + 3 Cu). A sheet of aluminum foil is being turned into copper. It is an example of a single replacement reaction.
Single Replacement
In a single replacement reaction a single element replaces another in a compound.
Ex 1.) A + BC --> AC + B
Ex 2.) 2 Al + 3 CuCl2 --> 2 AlCl3 + 3 Cu
(picture to the right)
sciber/chemtype.htm

12. This is a picture of Barium Chloride & Sodium Sulfate (BaCl2 + Na2SO4 --> BaSO4 + 2NaCl). It is an example of a double replacement reaction.
Double Replacement
In a double replacement reaction parts of two compounds switch places to form two new compounds.
Ex 1.) AB + XY --> AY + XB
Ex 2.) BaCl2 + Na2SO4 --> BaSO4 + 2NaCl (picture to the right)

13. Bibliography