๐ฅถEndothermic vs Exothermic๐ฅ
Reactions either take in or give out energy. The sign of the enthalpy change tells you which, and energy diagrams make it visual.
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๐ฅถEndothermic
- โAbsorbs heat from the surroundings
- โEnthalpy change is positive
- โProducts have more energy than reactants
- โSurroundings get colder
- โExamples: photosynthesis, ice melting
๐ฅExothermic
- โReleases heat to the surroundings
- โEnthalpy change is negative
- โProducts have less energy than reactants
- โSurroundings get warmer
- โExamples: combustion, neutralization
Verdict
Endothermic reactions absorb energy and feel cold; exothermic reactions release energy and feel hot. The sign of ฮH tells you instantly which category applies.
Frequently asked
How does the sign of ฮH help?+
A positive ฮH means endothermic (heat absorbed); a negative ฮH means exothermic (heat released).
Why does an instant cold pack feel cold?+
It uses an endothermic dissolving process that absorbs heat from your skin.
Is combustion endo or exothermic?+
Combustion is strongly exothermic, releasing large amounts of heat and light.
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