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According to the Newton "Ask a Scientist" page, exothermic-phase changes are those that give off energy or heat, such as liquid water freezing into ice or water vapor condensing to liquid water. Scientific American expla... More »

Sublimation, when a solid transforms into a gas, is an endothermic phrase change, while deposition, when a gas transforms to a solid, is an exothermic phase change. There are a total of six phase changes in matter, and t... More »

A phase change, also known as a phase transition, is a transformation in the physical state of a certain sample of matter. The phrase is most commonly used to describe the transition of a material between solid, liquid, ... More »

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From water vapor in the atmosphere and ice in glaciers to all forms of liquid water in between, water sources are numerable and vary. The types of water sources depend on the state of the water. More »

Freezing water is an exothermic process because there is a release of energy into the environment in the form of heat. In an exothermic reaction, the change in enthalpy or measure of heat content, is negative. More »

The word equation for wood combustion is that wood in the presence of oxygen and high heat combusts to produce carbon dioxide, water vapor, heat and ash residue. Wood combustion gives off heat because it is an exothermic... More »

Examples of exothermic processes include burning of coal, rust formation and dissolution of quick lime in water. On the other hand, some endothermic processes include dissolution of Ammonium Chloride in water and nitric ... More »