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endothermic and exothermic reactions

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joshua white

on 28 April 2015

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Transcript of endothermic and exothermic reactions

Joshua White & Yvette Barragan

Chemical Reactions:
Exothermic Vs. Endothermic

Caesium hydroxide and hydrogen are formed

The Reaction
2Cs (s) + 2H2O (l) → 2CsOH (aq) + H2 (g)
The Brick Demo
Activation energy: what gets a reaction going
An exothermic reaction does not need as much activation energy as an endothermic
An exothermic reaction releases energy so it can do work
Endothermic reactions don't release as much force, or energy, as what it needs to get started
Endo Vs. Exo
take in energy
energy absorbed cool things down
endothermic reactions have positive energy charge
energy is absorbed as heat

Example of Exothermic Reaction
in Action
making ice cubes
a candle flame
burning sugar
rusting iron
crystallizing liquid salts
Example of Endothermic Reaction
Baking bread - the bread bakes and rises by absorbing heat
Reaction Coordinate
release energy
energy is released as heat
energy released warms things up
exothermic reactions have negative energy charge
evaporation of water / melting ice
cooking an egg
producing sugar by photosynthesis

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