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Clues To Chemical ChangesWith Examples
Significant Release of Heat
• Reaction of Calcium Chloride and Water
• CaCl2 +H2O Ca(OH)2 +2HCl
Significant Absorption of Heat
• Water and Ammonium Nitrate
• NH4NO3 (s) NH4+(aq) + NO3-(aq)
Fizzing and Foamingproduction of a gas 1
• Decomposition of Hydrogen peroxide
• 2H2O2 2H2O + O2(g)
Fizzing and Foamingproduction of a gas 2
• Reaction of Vinegar and Baking soda
• NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O + CO2
Production of Odor
• Castor Oil and Sodium Carbonate
• C6H6O2 + Na2CO3 C13H20O + others
Production of Light
• Phenyl Oxalate and Hydrogen Peroxide
• C14H10O4 + H2O2 C6H6O + 2 CO2
Precipitation
• Calcium Chloride and Baking Soda
• 2 NaHCO3 + CaCl2 ===> CaCO3 + CO2 + 2 NaCl + H2O•
Unexpected Change in Color