https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:reaction-rates-and-equilibrium/x2613d8165d88df5e:equilibrium-lechatelier-s-principle/v/reversible-reactions-and-equilibrium 2023-12-15T18:39:28.793791463Z Reversible reactions and equilibrium Reversible reactions are chemical processes that proceed in the forward and backward directions. When the rate of the forward and backward reactions are equal, the process is in equilibrium. At equilibrium, the reactions do not stop. Instead, the amount of each substance becomes constant. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/f2aed7ef-eebb-454f-b5a4-110cc1a3f2cb_1280_720_base.png Reversible reactions and equilibrium Reversible reactions are chemical processes that proceed in the forward and backward directions. When the rate of the forward and backward reactions are equal, the process is in equilibrium. At equilibrium, the reactions do not stop. Instead, the amount of each substance becomes constant. https://cdn.kastatic.org/ka-youtube-converted/i_LCF8gmcWQ.mp4/i_LCF8gmcWQ.mp4 159 Reversible reactions and equilibrium https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:equilibrium/x2eef969c74e0d802:introduction-to-equilibrium/v/direction-of-reversible-reactions 2022-09-15T10:37:14.07019524Z Direction of reversible reactions For a reversible reaction, if the rate of the forward reaction is greater than the rate of the reverse reaction, there is a net conversion of reactants to products. If the rate of the forward reaction is less than the rate of the reverse reaction, there is a net conversion of products to reactants. If the two rates are equal, the reaction is at equilibrium. Jay video https://cdn.kastatic.org/ka_thumbnails_cache/e411b5ba-1fe5-444a-811e-1a193f60ee9e_1280_720_base.png Direction of reversible reactions For a reversible reaction, if the rate of the forward reaction is greater than the rate of the reverse reaction, there is a net conversion of reactants to products. If the rate of the forward reaction is less than the rate of the reverse reaction, there is a net conversion of products to reactants. If the two rates are equal, the reaction is at equilibrium. https://cdn.kastatic.org/ka-youtube-converted/9u914ckHlUI.mp4/9u914ckHlUI.mp4 448 Reversible reactions and equilibrium https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:equilibrium/x2eef969c74e0d802:introduction-to-equilibrium/v/dynamic-equilibrium 2022-09-05T08:18:59.810508578Z Dynamic equilibrium Many physical and chemical processes are reversible. A reversible process is said to be in dynamic equilibrium when the forward and reverse processes occur at the same rate, resulting in no observable change in the system. Once dynamic equilibrium is established, the concentrations or partial pressures of all species involved in the process remain constant. Jay video https://cdn.kastatic.org/ka_thumbnails_cache/ac7dc300-492c-47ad-9d34-02be898277c4_1280_720_base.png Dynamic equilibrium Many physical and chemical processes are reversible. A reversible process is said to be in dynamic equilibrium when the forward and reverse processes occur at the same rate, resulting in no observable change in the system. Once dynamic equilibrium is established, the concentrations or partial pressures of all species involved in the process remain constant. https://cdn.kastatic.org/ka-youtube-converted/zaHM74k9Z1w.mp4/zaHM74k9Z1w.mp4 491 Reversible reactions and equilibrium https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:reaction-rates-and-equilibrium/x2613d8165d88df5e:equilibrium-lechatelier-s-principle/v/le-chatelier-s-principle_hs 2023-12-15T18:39:28.793791463Z Le Châtelier's principle The conditions of a chemical system in equilibrium can change. Le Chatlier's principle says a system at equilibrium responds to changes in predictable ways. The response to a change always occur in a direction that reestablishes equilibrium. And the response to a change always opposes the change to the system. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/4093d691-1792-43ec-94f8-07c6bd9bb505_1280_720_base.png Le Châtelier's principle The conditions of a chemical system in equilibrium can change. Le Chatlier's principle says a system at equilibrium responds to changes in predictable ways. The response to a change always occur in a direction that reestablishes equilibrium. And the response to a change always opposes the change to the system. https://cdn.kastatic.org/ka-youtube-converted/B2pP02GEZL4.mp4/B2pP02GEZL4.mp4 346 Reversible reactions and equilibrium https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:equilibrium/x2eef969c74e0d802:le-chatelier-s-principle/v/worked-example-using-le-chateliers-principle-to-predict-shifts-in-equilibrium 2022-10-05T02:43:18.611402953Z Worked example: Using Le Chȃtelier’s principle to predict shifts in equilibrium In this video, we'll use Le Chȃtelier’s principle to predict how an equilibrium system will shift in response to various stresses, including changes in concentration, volume, and temperature. Jay video https://cdn.kastatic.org/ka_thumbnails_cache/2e596409-84fa-4c28-a6e5-e9b04f717021_1280_720_base.png Worked example: Using Le Chȃtelier’s principle to predict shifts in equilibrium In this video, we'll use Le Chȃtelier’s principle to predict how an equilibrium system will shift in response to various stresses, including changes in concentration, volume, and temperature. https://cdn.kastatic.org/ka-youtube-converted/YBEoLzMWCdM.mp4/YBEoLzMWCdM.mp4 238 Reversible reactions and equilibrium https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:equilibrium/x2eef969c74e0d802:le-chatelier-s-principle/v/le-chateliers-principle-changing-temperature 2022-09-05T08:18:59.810508578Z Le Chȃtelier’s principle: Changing temperature Le Chȃtelier’s principle can be used to predict the effect that a stress like changing temperature has on a system at equilibrium. If the temperature of the system is increased (at constant V), the system will shift in the direction that consumes the excess heat. If the temperature of the system is decreased, the reverse effect will be observed. Jay video https://cdn.kastatic.org/ka_thumbnails_cache/ea29dc2b-8307-4daa-aad9-7010f1819348_1280_720_base.png Le Chȃtelier’s principle: Changing temperature Le Chȃtelier’s principle can be used to predict the effect that a stress like changing temperature has on a system at equilibrium. If the temperature of the system is increased (at constant V), the system will shift in the direction that consumes the excess heat. If the temperature of the system is decreased, the reverse effect will be observed. https://cdn.kastatic.org/ka-youtube-converted/j7FOzKIDrg8.mp4/j7FOzKIDrg8.mp4 676 Reversible reactions and equilibrium https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:equilibrium/x2eef969c74e0d802:le-chatelier-s-principle/v/worked-example-calculating-the-equilibrium-total-pressure-after-a-change-in-volume 2022-10-05T02:43:18.611402953Z Worked example: Calculating the equilibrium total pressure after a change in volume How does the total pressure change when the volume of a gaseous equilibrium system is reduced? In this video, we'll explore the answer to this question using both qualitative and quantitative approaches. Jay video https://cdn.kastatic.org/ka_thumbnails_cache/f75c8402-d9ce-42d7-913e-cbaaaf438df3_1280_720_base.png Worked example: Calculating the equilibrium total pressure after a change in volume How does the total pressure change when the volume of a gaseous equilibrium system is reduced? In this video, we'll explore the answer to this question using both qualitative and quantitative approaches. https://cdn.kastatic.org/ka-youtube-converted/2q5UPN4tF20.mp4/2q5UPN4tF20.mp4 431 Reversible reactions and equilibrium https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:equilibrium/x2eef969c74e0d802:le-chatelier-s-principle/v/le-chateliers-principle-changing-concentration 2022-09-05T08:18:59.810508578Z Le Chȃtelier’s principle: Changing concentration Le Chȃtelier’s principle can be used to predict the effect that a stress like changing concentration has on a reaction system at equilibrium. If the concentration of a reaction species is increased (at constant T and V), the equilibrium system will shift in the direction that reduces the concentration of that species. If the concentration of a reaction species is decreased, the reverse effect will be observed. Jay video https://cdn.kastatic.org/ka_thumbnails_cache/ce9abdbc-f3f0-4295-b627-4a2af19e90a9_1280_720_base.png Le Chȃtelier’s principle: Changing concentration Le Chȃtelier’s principle can be used to predict the effect that a stress like changing concentration has on a reaction system at equilibrium. If the concentration of a reaction species is increased (at constant T and V), the equilibrium system will shift in the direction that reduces the concentration of that species. If the concentration of a reaction species is decreased, the reverse effect will be observed. https://cdn.kastatic.org/ka-youtube-converted/jjmAGbcKEZY.mp4/jjmAGbcKEZY.mp4 518 Reversible reactions and equilibrium https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:chemical-reactions/x8bc8fb44369617ed:reversible-reactions-and-equilibrium/v/le-chateliers-principle-adding-a-catalyst-equilibrium-chemistry-khan-academy 2026-01-02T12:19:13.778632637Z Le Chatelier's Principle Adding a catalyst Equilibrium Chemistry Khan Academy This video talks about how a catalyst helps get to the equilibrium condition faster for a reversible reaction. It also addresses why adding a catalyst would not change the value of the equilibrium constant. The interesting factor is that a catalyst helps increase the rate of both the forward as well as the backward reaction by the same amount. Khan Academy Pakistan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Le Chatelier's Principle Adding a catalyst Equilibrium Chemistry Khan Academy This video talks about how a catalyst helps get to the equilibrium condition faster for a reversible reaction. It also addresses why adding a catalyst would not change the value of the equilibrium constant. The interesting factor is that a catalyst helps increase the rate of both the forward as well as the backward reaction by the same amount. https://cdn.kastatic.org/ka-youtube-converted/OjA90XKPZn0.mp4/OjA90XKPZn0.mp4 283 Reversible reactions and equilibrium https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:reaction-rates-and-equilibrium/x2613d8165d88df5e:equilibrium-lechatelier-s-principle/e/understand-equilibrium-lechateliers-principle 2026-04-28T11:00:37.315336883Z Understand: Equilibrium and Le Châtelier’s principle Check your understanding of equilibrium and Le Châtelier’s principle in this set of free practice questions. Allen Ruch exercise https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:reaction-rates-and-equilibrium/x2613d8165d88df5e:equilibrium-lechatelier-s-principle/e/apply-lechateliers-principle 2026-03-11T05:00:37.141016324Z Apply: Le Châtelier's principle Apply your understanding of Le Châtelier's Principle in this set of free practice questions. Allen Ruch exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:chemical-reactions/x8bc8fb44369617ed:reversible-reactions-and-equilibrium/e/using-le-chatelier-s-principle-exercise 2025-04-30T12:23:21.222584878Z Using Le Chatelier's principle Practice using Le Chatelier's principle to predict what happens to a reaction when a stress is applied Yuki exercise