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The difference between exothermic and endothermic reactions is found in their names: "endo" means to draw into itself, whereas "exo" means to emit. All chemical reactions either release or use energy, which can be in the... More »

www.reference.com Science Chemistry Atoms & Molecules

Evaporation is an endothermic process. These types of reactions occur when the temperature of the system decreases and the surroundings gain energy. Endothermic reactions end up with an overall positive heat of reaction. More »

www.reference.com Science Chemistry States of Matter

Vaporization is an example of an endothermic reaction. In chemistry, vaporization is defined as the transformation of a solid or liquid into gas. This is caused by either evaporation or boiling. More »

www.reference.com Science Chemistry States of Matter
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In the human digestive system, complex sugar molecules are broken down in the decomposition reactions that they undergo with enzymes present in the digestive tract. The process begins in the mouth, where these complex su... More »

www.reference.com Science Chemistry Atoms & Molecules

Alkaline earth metals, the elements in the second column of the periodic table, are the most likely elements to lose two electrons in chemical reactions. They include beryllium, magnesium, calcium, strontium, barium and ... More »

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Steel rusts because of chemical reactions that occur when it comes into contact with water and oxygen. Iron, one component of steel, combines with water and oxygen to produce hydrated iron (III) oxide, which is the chemi... More »

www.reference.com Science Chemistry Atoms & Molecules

In chemical reactions, chemical bonds are broken and reformed, and preexisting chemical bonds that contained a greater amount of energy than the newly created bonds will release their excess bond energy. When energy is r... More »

www.reference.com Science Chemistry Atoms & Molecules