https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:chemical-reactions/x2613d8165d88df5e:representing-chemical-reactions/v/physical-and-chemical-changes 2023-12-15T18:39:28.793791463Z Physical and chemical changes Physical and chemical processes can be classified by the changes occurring on the molecular level. In general, chemical processes involve changes in chemical bonds, while physical processes involve changes only in intermolecular forces. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/13f405e4-0927-4fb9-9b5e-913f069d17f9_1280_720_base.png Physical and chemical changes Physical and chemical processes can be classified by the changes occurring on the molecular level. In general, chemical processes involve changes in chemical bonds, while physical processes involve changes only in intermolecular forces. https://cdn.kastatic.org/ka-youtube-converted/n5cZ5CWuUJA.mp4/n5cZ5CWuUJA.mp4 279 Intro to chemical reactions https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:chemical-reactions/x2613d8165d88df5e:representing-chemical-reactions/v/intro-to-chemical-reactions-chemical-equation-and-reactions-chemistry-khan-academy 2026-04-08T23:10:43.121622596Z Intro to chemical equations Bonds between atoms or molecules are formed and/or broken during chemical reactions. Reactants are the inputs of a chemical reaction, and products are the outputs. Sal Khan video https://cdn.kastatic.org/googleusercontent/Z75oD-cJiGwdzgfe95kVhOnyPxF8KNuBGQi7d-Ap3DODJyIvHBOSqYwhAfUwvnRe4fqwLMRjq-YdEXlqakSM_ws Intro to chemical equations Bonds between atoms or molecules are formed and/or broken during chemical reactions. Reactants are the inputs of a chemical reaction, and products are the outputs. https://cdn.kastatic.org/ka-youtube-converted/1wQqGFebxyA.mp4/1wQqGFebxyA.mp4 344 Intro to chemical reactions https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:chemical-reactions/x2613d8165d88df5e:representing-chemical-reactions/a/symbols-in-chemical-equations 2026-03-19T20:22:14.979311387Z Symbols in chemical equations Learn the meaning behind the symbols we use to represent chemical reactions. article https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:chemical-reactions/x2613d8165d88df5e:representing-chemical-reactions/e/apply-representing-chemical-reactions 2026-03-02T06:20:38.576309557Z Apply: representing chemical reactions Apply your understanding of using chemical equations to represent chemical reactions in this set of free practice questions. Fig exercise https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:chemical-reactions/x2613d8165d88df5e:representing-chemical-reactions/e/apply-counting-atoms-in-chemical-equations 2024-03-08T16:11:13.121317577Z Apply: counting atoms in chemical equations Apply your understanding of subscripts and coefficients in chemical equations in this set of free practice questions. Fig exercise https://www.khanacademy.org/science/bridge-course-class-10th-science/x37589313f9a4c197:chemical-reactions-and-equations/x37589313f9a4c197:intro-to-chemical-reactions/e/chemical-reactions-and-chemical-equations 2026-04-07T23:36:17.218592739Z Chemical Reactions and Chemical Equations Lets answer some questions on chemical reactions and equations. Shankar R exercise