Primary explosives are extremely sensitive to impact,...

Primary explosives are extremely sensitive to impact, friction, or static electricity, and only a small amount of energy is required to initiate the explosion. Secondary and tertiary explosives require more energy to start a reaction, and often primary explosives are used to initiate their reaction. Using a potential energy diagram, show how a primary explosive would start the reaction of a secondary explosive.

Key Concepts

Explosive Classification

Explosives are categorized as primary, secondary, or tertiary based on their sensitivity and the amount of energy required to initiate their reactions. Primary explosives are highly sensitive to stimuli like impact or friction and are used to trigger the detonation of secondary explosives, which are more stable and require a higher energy input to react.

Sensitivity and Initiation

Sensitivity refers to how readily an explosive responds to external stimuli such as impact, friction, or static electricity. Primary explosives exhibit high sensitivity, meaning only a small amount of energy is needed to initiate them. This property allows them to serve as initiators for secondary explosives, which require a greater energy input to overcome their activation barrier.

Potential Energy Diagram

A potential energy diagram is used to illustrate the energy changes during a chemical reaction, including the activation energy needed to reach the transition state. In such diagrams, the energy level of reactants, the peak representing the activation energy, and the final energy level of the products are depicted. This visualization helps explain how a primary explosive, releasing energy with a lower activation barrier, can supply sufficient energy to overcome the higher activation barrier of a secondary explosive.

Activation Energy

Activation energy is the minimum energy required for a chemical reaction to occur. In the context of explosives, secondary explosives have a higher activation energy, meaning that they need an external energy source (typically provided by a primary explosive) to reach the transition state and initiate the explosive reaction.

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