exothermic and endothermic reactions part 5 of our may mcas cram series!
TRANSCRIPT
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Exothermic and Endothermic Reactions
Part 5 of our May MCAS cram series!
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First, two important reminders:Energy, like matter, cannot be created or destroyed. Energy can change forms.
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Exothermic Reaction
• An exothermic reaction is any reaction in which heat (energy) is released into the system as a product.
• This means the reactants have more potential energy than the products.
This is what an exothermic reaction graph looks like. Note the products line is lower than the reactants line.
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Some Exothermic Reaction Examples• Candle flame• Rusting iron• Burning sugar• Formation of snow• Condensation
If the last two sound weird to you, remember: heat energy always moves from warmer to colder to achieve an energy balance.
For snow formation: heat energy leaves the water droplets to the colder surrounding area. The water droplets’ colder molecules contract and form… snow. Exothermic!
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Endothermic Reaction• An endothermic
reaction is any reaction in which heat (energy) is absorbed into the system as a product.
• This means the reactants have less potential energy than the products.
This is what an endothermic reaction graph looks like. Note the products line is higher than the reactants line.
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Some Endothermic Reaction Examples• Melting ice cubes• Evaporation of water• Photosynthesis• Baking bread• Cooking an egg
Again, in a system, heat energy moves from warmer to cooler. In the examples above, the products absorb heat from the system, become hotter, and react. Endothermic!
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Colonel Sanders: Master Thermochemist
• Use your thermometer! Look at the temperature of the system before and after a reaction.
• If after’s temperature is higher than before’s = exothermic
• If before’s temperature is higher than after’s = endothermic
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MCAS QuestionsConservation Exo/Endo
Cram Day 5
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Conservation Exo/Endo
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Conservation Exo/Endo
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Conservation Exo/Endo
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Conservation Exo/Endo
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Conservation Exo/Endo
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Conservation Exo/Endo