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 » Science Chemistry

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 » Science Chemistry States of Matter

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 » Geography Bodies of Water
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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 » Science Chemistry

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 » Science Chemistry

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 » Science Chemistry

A phase change in science refers to any substance that changes from one state to another, with possible states being gas, liquid and solid. Substances typically phase change to the closest related state, such as liquid t... More » Science Chemistry