What are some examples of exothermic and endothermic processes?

I a student looking for common and not so common occurances of endothermic and exothermic processes. I am trying to achieve an understanding of this occurances to be able to recognize them myself. Thanks.
Terry Holbrook

When trying to classify a process as exothermic or endothermic, watch how the temperature of the surroundings changes. An exothermic process releases heat, and causes the temperature of the immediate surroundings to rise. An endothermic process absorbs heat and cools the surroundings. Can you think of a way to test the classification of each of these processes?

Exothermic processes Endothermic processes
making ice cubesmelting ice cubes
formation of snow in cloudsconversion of frost to water vapor
condensation of rain from water vaporevaporation of water
a candle flameforming a cation from an atom in the gas phase
mixing sodium sulfite and bleachbaking bread
rusting ironcooking an egg
burning sugarproducing sugar by photosynthesis
forming ion pairsseparating ion pairs
Combining atoms to make a molecule in the gas phasesplitting a gas molecule apart
mixing water and strong acidsmixing water and ammonium nitrate
mixing water with an anhydrous saltmaking an anhydrous salt from a hydrate
crystallizing liquid salts (as in sodium acetate in chemical handwarmers) melting solid salts
nuclear fissionreaction of barium hydroxide octahydrate crystals with dry ammonium chloride
mixing water with calcium chloridereaction of thionyl chloride (SOCl2) with cobalt(II) sulfate heptahydrate

Author: Fred Senese senese@antoine.frostburg.edu



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