Absorption or evolution of heat: All chemical reactions involve exchange of energy in the form of heat or in some other form between reactants and their surroundings. Sometimes ene... Absorption or evolution of heat: All chemical reactions involve exchange of energy in the form of heat or in some other form between reactants and their surroundings. Sometimes energy released and sometimes energy is absorbed by the reactants during a chemical reaction.
Understand the Problem
The question discusses the concept of heat exchange during chemical reactions, specifically the absorption and evolution of heat by reactants. It seeks to understand how energy is transferred between reactants and their surroundings.
Answer
Exothermic reactions release energy; endothermic reactions absorb energy.
Chemical reactions involve energy exchange as heat; exothermic reactions release energy, while endothermic reactions absorb it.
Answer for screen readers
Chemical reactions involve energy exchange as heat; exothermic reactions release energy, while endothermic reactions absorb it.
More Information
In every chemical reaction, breaking bonds requires energy, and forming bonds releases energy. The net energy change determines if the reaction is exothermic or endothermic.
Tips
A common mistake is to assume that all reactions either only release or absorb energy. Always consider both bond breaking and forming.
Sources
- Endothermic vs. exothermic reactions (article) - Khan Academy - khanacademy.org
- Exothermic, Endothermic, & Chemical Change - highschoolenergy.acs.org
- 2.3.2: Energy Changes in Chemical Reactions - Biology LibreTexts - bio.libretexts.org
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