The standard enthalpy of reaction denotes the heat lost or gained during a chemical reaction when one molar mass of a substance reacts under standard conditions. The standard enthalpy of reaction is shown as "?H" or "del... More » Science Chemistry

Enthalpy is calculated by summing up the energy changes taking place in individual steps of a chemical process. To arrive at the enthalpy changes, Hess’s law is employed. It states that the enthalpy change accompanying a... More » Science Physics Thermodynamics

The enthalpy of dissolution is the change in the thermodynamic potential of a substance when it is dissolved at a constant pressure in a solvent until it reaches an infinite dilution. The enthalpy of dissolution is commo... More » Science Chemistry
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The enthalpy of formation is defined as the energy, in the form of heat, given off or absorbed during a chemical reaction under the most stable conditions for the reaction to occur from pure elements. The basic formula f... More » Science Chemistry

The standard enthalpy of formation is the change in heat required to form a particular product through a chemical reaction. It is also commonly called the standard heat of formation, and it is represented by the variable... More » Science Physics Thermodynamics

The law of conservation of mass states that the mass of the reactants and the mass of products in a chemical reaction are equal. This refers to matter not being destroyed or created. More » Science Chemistry

Hand warmers work by creating an exothermic chemical reaction that produces heat when the contents react with air or each other. Most commonly, hand warmers use pouches of fine iron filings that oxidize in the presence o... More » Science Chemistry