Chemistry Regents Practice Test 2025 - Free Chemistry Regents Practice Questions and Study Guide

Question: 1 / 400

Define "enthalpy."

A measure of disorder in a system

A measure of the total energy of a thermodynamic system

Enthalpy is defined as a measure of the total energy of a thermodynamic system, which includes both the internal energy of the system and the energy associated with the pressure and volume of the system. It is a crucial concept in chemistry, particularly in the context of thermodynamics and reactions, as it allows scientists to understand how energy changes during chemical reactions, phase changes, and other processes.

Specifically, enthalpy incorporates the heat content of the system, making it instrumental in predicting the heat exchanged in reactions conducted at constant pressure. In practical applications, changes in enthalpy can indicate whether a reaction is exothermic (releases heat) or endothermic (absorbs heat), providing essential information needed for various chemical calculations and energy considerations in reactions.

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A measure of the rate of a chemical reaction

A measure of the energy in a magnetic field

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