1. Today’s Objective:
The student will be able to identify the 4 types of equations in a written assignment.

2. Reactions Changes in matter are described by: Physical changes
Chemical Changes

3. Changes in Matter Physical changes Does not become new substance
Can be change in shape, size, or texture
Can also be changes in state i.e. melting

4. Changes in Matter Chemical Changes Changes create something new
Produces new product such as gas
Also called chemical reactions

5. Chemical Reactions Chemical Reaction requires: Bonds to break
Atoms will rearrange
New bonds form
New products are made

6. Clues to a Chemical Reaction
1. Gas Formation – bubbling or fizzing
2. A new solid forms called a precipitate
3. Color change
4. Energy change – gets hotter or colder

7. Changes in Energy Either absorbs or releases energy
Endothermic – energy is absorbed, product becomes hotter
Exothermic – energy is released, product becomes colder

8. Types of Reactions Combustion Synthesis Decomposition
Single Replacement
Double Replacement

9. Combustion One of its reactants is Oxygen.
Its products include H2O + CO2

10. Synthesis Reactions
2 or more chemicals combine to form a single compound
Na + Cl => NaCl

11. Decomposition Reaction
A single compound breaks apart to 2 or more smaller parts.
NaCL => Na + Cl

12. Single Replacement Reaction
A single element is combined with a compound.
After reaction, a new element is single and you have a new compound
NH3 + I2 => N2I6 + H2

13. Double-replacement reaction
Begin with two compounds.
After reaction, you have 2 new compounds.
NaOH + KNO3 => NaNO3 + KOH

14. Example of Double-Replacement Reaction
Example: Sodium chloride (salt) reacts with Silver Nitrate and splits up to make Sodium Nitrate and Silver Chloride.