Endothermic reactions are chemical reactions which absorb energy from the environment. The products of the reaction store the energy absorbed in the form of chemical bonds, according to More » Science Physics Thermodynamics

Combustion reactions can only be exothermic. In chemical reactions, old bonds are broken to form new ones. Depending on the energy difference between broken and formed bonds, the total reaction energy is either positive ... More » Science Chemistry

A chemical reaction can be shown to be endothermic if it absorbs heat and causes a decrease in the temperature of its surroundings. Illustrative lab experiments performed in schools to demonstrate endothermic reactions o... More » Science Chemistry
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During endothermic reactions, energy is absorbed from the surrounding environment. The energy is typically transferred in the form of heat energy, and causes the reaction mixture and its environs to cool. A thermometer c... More » Science Chemistry

Not all spontaneous reactions occur instantly because of the availability or absence of free energy that the reacting species need to carry out the reaction. This energy is known as the Gibbs free energy. More » Science Chemistry Atoms & Molecules

Energy can play many different roles in chemical reactions, and it can be a product of a chemical reaction, a necessary component for a chemical reaction, or energy can have little part in a chemical reaction. Chemical r... More » Science Chemistry

Catalytic heaters produce heat through flameless chemical reactions. Many space heaters are catalytic. Soldering irons and disposable chemical heat packs are also catalytic heaters. They produce heat gradually, which is ... More » Science Physics Thermodynamics