REACTIVE CHEMICALS. NATURE OF THE HAZARD GENERAL CATEGORIES: 1. REDOX REACTIONS 2. EXPLOSIVES 3. PYROPHORIC AND WATER REACTIVE. 1. REDOX REACTIONS. a. General Chemistry Review Definition / types Example reaction / oxidation #’s Oxidizing agents (oxidizers).
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NATURE OF THE HAZARD
1. REDOX REACTIONS
3. PYROPHORIC AND
a. General Chemistry Review
Definition / types
Example reaction / oxidation #’s
Oxidizing agents (oxidizers)
b. Properties of Oxidizers
Increase burning rate of combustibles (redox rxn)
Involved in exothermic redox reactions
Decompose to O2 to support combustion
** Do not store oxidizers with combustibles
c. Factors Affecting Redox Rxn Rate
Particle Size of Combustibles
d. Examples of Oxidizers
General Formula (R-O-O-R)
PEROXIDE FORMING CHEMICALS
See article by Nagel
NITRIC ACID, NITRATES, NITRITES
S.S. Grandcamp Accident, Texas City, Texas, 1947 (see Nagel article)
e. Examples of Reducing Agents
Uses / hazards
Substance that detonates spontaneously or as a result of friction, mechanical impact, or heat.
b. Characteristics of Explosives
Rapid redox reaction
Products are simple (stable) gases
Explain why shock wave created?
Atmospheric O2 often not required
Explosive substance contains both oxidizing agent and reducing agent
c. Examples of Explosives
Substances that oxidize in air and ignite spontaneously.
Most are also water reactive.
Alkali Metals – Na, K
Powdered Metals- Al, Mg, Zn
Properties of Sodium Metal
Rxn with O2
Rxn with water
Comparison to reactions of K, Li
** Remember common precautionary measures and emergency procedures when handling reactives !!