https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:chemical-reactions/x2613d8165d88df5e:energy-of-chemical-reactions/v/endothermic-and-exothermic-reactions 2023-12-15T18:39:28.793791463Z Endothermic and exothermic reactions Chemical reactions can result in energy being released (exothermic) or energy being absorbed (endothermic). We can use the law of conservation of energy to determine how that energy is transferred between a system and its surroundings. Energy diagrams visually represent potential energy changes during a reaction, providing quantitative information about the bond-breaking and bond-forming process. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/766dc977-087f-4a15-bb65-66bf2cac51f9_1280_720_base.png Endothermic and exothermic reactions Chemical reactions can result in energy being released (exothermic) or energy being absorbed (endothermic). We can use the law of conservation of energy to determine how that energy is transferred between a system and its surroundings. Energy diagrams visually represent potential energy changes during a reaction, providing quantitative information about the bond-breaking and bond-forming process. https://cdn.kastatic.org/ka-youtube-converted/GSfwMq68Wt4.mp4/GSfwMq68Wt4.mp4 343 Exothermic and endothermic reactions https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:chemical-energetics/x8bc8fb44369617ed:exothermic-and-endothermic-reactions/a/endothermic-vs-exothermic-reactions-class-10-chemistry 2021-04-29T08:01:46Z Endothermic vs. exothermic reactions article https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:thermodynamics/x2eef969c74e0d802:endothermic-and-exothermic-processes/v/endothermic-and-exothermic-processes 2022-10-05T02:43:18.611402953Z Endothermic and exothermic processes The first law of thermodynamics relates the change in the internal energy of a system (ΔE) to the heat transferred (q) and the work done (w). At constant pressure, q is equal to the change in enthalpy (ΔH) for a process. If ΔH is positive, the process absorbs heat from the surroundings and is said to be endothermic. If ΔH is negative, the process releases heat to the surroundings and is said to be exothermic. Phase changes, chemical reactions, and the formation of solutions are all examples of endothermic and exothermic processes. Jay video https://cdn.kastatic.org/ka_thumbnails_cache/505019ce-a6a7-4c2b-abe4-0a3431f5ee0a_1280_720_base.png Endothermic and exothermic processes The first law of thermodynamics relates the change in the internal energy of a system (ΔE) to the heat transferred (q) and the work done (w). At constant pressure, q is equal to the change in enthalpy (ΔH) for a process. If ΔH is positive, the process absorbs heat from the surroundings and is said to be endothermic. If ΔH is negative, the process releases heat to the surroundings and is said to be exothermic. Phase changes, chemical reactions, and the formation of solutions are all examples of endothermic and exothermic processes. https://cdn.kastatic.org/ka-youtube-converted/JPxTgtUx9sE.mp4/JPxTgtUx9sE.mp4 480 Exothermic and endothermic reactions https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:chemical-reactions/x2613d8165d88df5e:energy-of-chemical-reactions/e/understand-energy-of-chemical-reactions 2026-04-28T11:00:37.315336883Z Understand: Energy of chemical reactions Check your understanding of energy changes in chemical reactions in this set of free practice questions. Fig exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:chemical-energetics/x8bc8fb44369617ed:exothermic-and-endothermic-reactions/v/exothermic-and-endothermic-reactions-ur 2025-08-08T00:50:08.705567982Z Exothermic and endothermic reactions Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Exothermic and endothermic reactions Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/8bX9vw1-Ers.mp4/8bX9vw1-Ers.mp4 689 Exothermic and endothermic reactions https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:chemical-energetics/x8bc8fb44369617ed:exothermic-and-endothermic-reactions/v/exothermic-and-endothermic-common-processes-and-solved-examples-ur 2025-08-08T00:50:08.705567982Z Exothermic and endothermic: Common processes and solved examples Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Exothermic and endothermic: Common processes and solved examples Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/Yh4PlT2jU2Y.mp4/Yh4PlT2jU2Y.mp4 371 Exothermic and endothermic reactions https://www.khanacademy.org/science/grade-9-chemistry-snc-aligned/x22d5b83c2ea2dc38:energetics/x22d5b83c2ea2dc38:exothermic-and-endothermic-reactions/v/all-types-of-reactions-solved-examples-ur 2025-08-08T00:50:08.705567982Z All types of reactions: Solved examples Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw All types of reactions: Solved examples Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/H9EGPBcTU_o.mp4/H9EGPBcTU_o.mp4 483 Exothermic and endothermic reactions https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:chemical-energetics/x8bc8fb44369617ed:exothermic-and-endothermic-reactions/e/exothermic-and-endothermic-reactions 2026-03-06T13:21:33.841038103Z Exothermic and endothermic reactions Let's practice problems involving exothermic and endothermic reactions. Chaitra exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:chemical-energetics/x8bc8fb44369617ed:exothermic-and-endothermic-reactions/v/energy-changes-in-chemical-reactions-part-1 2025-03-21T20:29:57.678923887Z Energy changes in chemical reactions (part 1) Chemical reactions often involve energy changes. In exothermic processes, like combustion, energy is released to the surroundings, making them warmer. In endothermic processes, like photosynthesis, energy is absorbed, often from the sun. The law of conservation of energy states that energy is never created or destroyed—only transferred or stored in different forms. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/aa0b7cee-d09b-4345-ab05-5a9fabd4215d_1280_720_base.png Energy changes in chemical reactions (part 1) Chemical reactions often involve energy changes. In exothermic processes, like combustion, energy is released to the surroundings, making them warmer. In endothermic processes, like photosynthesis, energy is absorbed, often from the sun. The law of conservation of energy states that energy is never created or destroyed—only transferred or stored in different forms. https://cdn.kastatic.org/ka-youtube-converted/Xu8S3aC8YWk.mp4/Xu8S3aC8YWk.mp4 444 Exothermic and endothermic reactions https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:chemical-energetics/x8bc8fb44369617ed:exothermic-and-endothermic-reactions/v/energy-changes-in-chemical-reactions-part-2 2025-03-21T20:29:57.678923887Z Energy changes in chemical reactions (part 2) Chemical reactions involve energy changes—some release energy (exothermic), while others absorb it (endothermic). The amount of energy transferred depends on the type and amount of reactants. The reaction rate can be increased by adding more reactants, raising the temperature, or improving particle distribution to encourage more collisions. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/815611d5-2408-4e22-aa17-e3cefeb1e8ea_1280_720_base.png Energy changes in chemical reactions (part 2) Chemical reactions involve energy changes—some release energy (exothermic), while others absorb it (endothermic). The amount of energy transferred depends on the type and amount of reactants. The reaction rate can be increased by adding more reactants, raising the temperature, or improving particle distribution to encourage more collisions. https://cdn.kastatic.org/ka-youtube-converted/ZCVcPikgki0.mp4/ZCVcPikgki0.mp4 466 Exothermic and endothermic reactions https://www.khanacademy.org/science/ms-chemistry/xc370bc422b7f75fc:chemical-changes/xc370bc422b7f75fc:energy-changes-in-chemical-reactions/e/understand-energy-changes-in-chemical-reactions 2026-04-28T11:00:37.315336883Z Understand: Energy changes in chemical reactions Check your understanding of energy changes that occur during chemical reactions in this set of free, standards-aligned practice questions. donna fig exercise https://www.khanacademy.org/science/ms-chemistry/xc370bc422b7f75fc:chemical-changes/xc370bc422b7f75fc:energy-changes-in-chemical-reactions/e/apply-energy-changes-in-chemical-reactions 2026-04-30T07:30:36.209464894Z Apply: Energy changes in chemical reactions Apply your understanding of energy changes that occur during chemical reactions in this set of free, standards-aligned practice questions. donna fig exercise