The enthalpy of vaporization is the energy, in the form of heat, that a substance needs to change from a liquid to a gas at a constant temperature and pressure. Enthalpy of vaporization, designated as "delta H vap," is m... More »

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Delta H denotes the change in enthalpy, or energy, between products and reactants in chemical reactions. The change in enthalpy across a chemical reaction is the standard enthalpy of formation of the products minus the s... More »

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Table salt, which is sodium chloride, is an ionic compound. The attractive forces between the positive and negative ions in ionic compounds are strong and require a large amounts of energy to break. This means that a hig... More »

The heat of vaporization is the amount of energy that is required to convert a substance from liquid to gaseous state without changing its temperature. A substance with a high heat of evaporation takes longer to transfor... More »

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 »

Diffusion is caused when heat in a gas or water environment creates energy that is absorbed by particles, making them move. This is referred to as thermal motion. Each particle moves in a different direction, but the dir... More »

The specific heat capacity of a metal (or any other substance) is the amount of heat energy required to increase the temperature of 1 kilogram of the metal by 1 degree Celsius. This typically is measured in joules per ki... More »