Endothermic and Exothermic Processes

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Exothermic- the word describes a process that releases energy in the form of heat.

Forming a chemical bond releases energy and therefore is an exothermic process.

Exothermic reactions usually feel hot because it is giving heat to you.

Endothermic - a process or reaction that absorbs energy in the form of heat.

Breaking a chemical bond requires energy and therefore is Endothermic.

Endothermic reactions usually feel cold because it is taking heat away from you.

Exothermic Processes	Endothermic Processes
freezing water solidifying solid salts condensing water vapor making a hydrate from an anhydrous salt forming an anion from an atom in the gas phase Annihilation of matter E=mc² splitting of an atom	melting ice cubes melting solid salts evaporating liquid water making an anhydrous salt from a hydrate forming a cation from an atom in the gas phase splitting a gas molecule separating ion pairs cooking an egg baking bread
Exothermic Reactions	Endothermic Reactions
Combustion of hydrogen dissolving lithium chloride in water Burning of propane dehydration of sugar with sulfuring acid thermite decomposition of hydrogen peroxide decomposition od ammonium dichromate halogenation of acetylene	Reaction of barium hydroxide octahydrate crystals with dry ammonium chloride dissolving ammonium chloride in water reaction of thionyl chloride (SOCl₂) with cobalt(II) sulfate heptahydrate mixing water and ammonium nitrate mixing water with potassium chloride reacting ethanoic acid with sodium carbonate photosynthesis (chlorophyll is used to react carbon dioxide plus water plus energy to make glucose and oxygen)

An Endothermic Reaction- The reaction of barium hydroxide octahydrate crystals with dry ammonium chloride.	An Exothermic reaction- The combustion of Acetone peroxide.