1. Chemical Reactions

2. Chemical Reactions
New substances being created due to bonds between atoms breaking, and/or the atoms bonding in new combinations
The new substances will have new properties that are different from the properties of the original substances

3. Signs of a Chemical Reaction
A spontaneous color change
An odor is produced
Energy change (temperature rises/falls, light is produced, a sound is produced)
A gas is released
A precipitate (solid) is produced
***Not all signs happen in each reaction***

4. Chemical Equations
A shortened way to show the reaction that is taking place
Equations use formulas to represent the reactants (what enters into the reaction) and the products (the results of the reaction)
An arrow in the middle means a change has occurred (means “yields”)

5. Chemical Equations (con’t)
2 H2O H2 + O2
Reactants Products
Whatever elements start a reaction will be present at the end of a reaction, but in a different form/arrangement

6. Aluminum (Al) and Copper Chloride (CuCl2) solution
Al CuCl  AlCl Cu
Aluminum + Copper Chloride  Aluminum Chloride + Copper

7. Sodium Bicarbonate (NaHCO3) and Calcium Chloride (CaCl2) (with water and BTB)
White granules + white powder  white powder + white crystal + clear liquid + colorless gas
Why does it turn from blue to yellow?
BTB is an INDICATOR (a chemical that changes color to indicate the presence of another chemical)
It changes from blue to yellow when carbon dioxide is present

8. Sodium Bicarbonate (NaHCO3) and Acetic Acid (CH3COOH)
NaHCO CH3COOH  NaC2H3O2 + H2O + CO2
Sodium Bicarbonate + Acetic Acid  Sodium Acetate + water + carbon dioxide

9. Sodium Chloride (NaCl) and Water (H2O)
NaCl H2O  NaCl + H2O
salt water  salt water solution

10. Homework
Complete a 4 square vocabulary box for each of the following words:
Reactant
Product