Las bolsas de aire que protegen a los ocupantes de un...

Las bolsas de aire que protegen a los ocupantes de un automóvil en caso de accidente se expanden como resultado de una reacción química rápida. Desde el punto de vista en que los reactivos químicos (considerados como el sistema), ¿qué signos cree que tengan $q$ y w en este proceso?

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Key Concepts

First Law of Thermodynamics

This principle states that energy cannot be created or destroyed, only transferred or transformed. It quantifies the change in the system’s internal energy as the sum of heat exchanged with the surroundings and the work performed, allowing us to analyze energy flow during chemical reactions.

Sign Conventions for Heat and Work

In thermodynamics, it is important to correctly assign signs to different types of energy exchange. By convention, if a system releases heat to its surroundings, q is negative, and if the system does work on the surroundings, w is negative. These sign conventions help in systematically applying energy conservation principles.

Exothermic Reaction

An exothermic reaction is one that releases energy, usually in the form of heat, to its surroundings. For the system undergoing an exothermic process, the heat term q is negative since energy is lost by the system.

Expansion Work

When a system expands, it performs work on its surroundings by pushing against an external pressure. According to thermodynamic sign conventions, since the system is doing work, the work term w is negative, reflecting an energy loss from the system.

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