1. Clues To Chemical Changes With Examples

2. Significant Release of Heat Reaction of Calcium Chloride and Water CaCl 2 +H 2 O  Ca(OH) 2 +2HCl

3. Significant Absorption of Heat Water and Ammonium Nitrate NH 4 NO 3 (s)  NH 4 +(aq) + NO 3 -(aq)

4. Fizzing and Foaming production of a gas 1 Decomposition of Hydrogen peroxide 2H 2 O 2  2H 2 O + O 2 (g)

5. Fizzing and Foaming production of a gas 2 Reaction of Vinegar and Baking soda NaHCO 3 + HC 2 H 3 O 2 → NaC 2 H 3 O 2 + H 2 O + CO 2

6. Production of Odor Castor Oil and Sodium Carbonate C 6 H 6 O 2 + Na2CO3  C 13 H 20 O + others

7. Production of Light Phenyl Oxalate and Hydrogen Peroxide C 14 H 10 O 4 + H2O2  C6H6O + 2 CO2

8. Precipitation Calcium Chloride and Baking Soda 2 NaHCO3 + CaCl2 ===> CaCO3 + CO2 + 2 NaCl + H2O

9. Unexpected Change in Color