Endothermic and Exothermic Reactions Experiment
Every chemical reaction that exists is one of two things: endothermic or exothermic. The Greek root therm means temperature or heat, which gives us a clue about all reactions: there is energy exchange! Endo means "within" while exo means "outside," so these types of reactions are opposite.
Endothermic reactions are those which absorb heat during the reaction. They take in more energy than they give off, which leaves the surroundings cooler than the starting point. Evaporation of water by sunlight is a great example. The sun and the liquid water combine and the water absorbs energy and eventually becomes as gas.
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