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Endothermic and Exothermic Reactions (Endothermic Reactions, Examples,…
Endothermic and Exothermic Reactions
Endothermic Reactions
Examples
Energy is transferred between the SURROUDINGS and REACTANTS
Energy is stored in the bonds of the reactants
Energy is transferred from SURROUNDINGS to CHEMICAL BONDS
Surroundings get cooler
Cooking an egg
Melting ice
Photosynthesis
Ammonium chloride + water --> endothermic reaction (temp. down)
Exothermic Reactions
Energy is transferred from CHEMICAL BONDS to SURROUNDINGS
Surroundings get hotter
Examples
Precipitation reaction (when an insoluble solid forms) --> cannot dissolve in water
Neutralisation reaction (acid + alkali --> salt + water, neutral pH)
Displacement reaction (a more reactive metal DISPLACING a less reactive metal)
Reaction profiles
Trapped air reduces energy to and from surroundings
Diagrams