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 Types of chemical bonding https://www.khanacademy.org/science/strengthened-shs-chemistry-1/x174677b2bfa4bea2:measurements-in-chemistry/x174677b2bfa4bea2:types-of-chemical-bonding/v/physical-and-chemical-changes-changes-around-us-grade-7-science-khan-academy 2025-07-29T05:17:01.905978144Z Physical and Chemical Changes In this video, we explore how everyday processes—like lighting a candle, cooking veggies, or setting off fireworks—can involve both physical and chemical changes happening at the same time. Bitasta Datta video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Physical and Chemical Changes In this video, we explore how everyday processes—like lighting a candle, cooking veggies, or setting off fireworks—can involve both physical and chemical changes happening at the same time. https://cdn.kastatic.org/ka-youtube-converted/aMhvVfkJpUM.mp4/aMhvVfkJpUM.mp4 207 Types of chemical bonding https://www.khanacademy.org/science/ap-biology/chemistry-of-life/introduction-to-biological-macromolecules/a/chemical-bonds-article 2021-04-29T07:53:29Z Chemical bonds Chemical bonds hold molecules together and create temporary connections that are essential to life. Types of chemical bonds including covalent, ionic, and hydrogen bonds and London dispersion forces. article https://www.khanacademy.org/science/ap-biology/chemistry-of-life/introduction-to-biological-macromolecules/v/ionic-bonds 2023-03-31T23:16:47.953017837Z Ionic bonds Atoms interact with each other through the formation of chemical bonds. One type of chemical bond is an ionic bond. Ionic bonds result from the attraction between oppositely charged ions. For example, sodium cations (positively charged ions) and chlorine anions (negatively charged ions) are connected via ionic bonds in sodium chloride, or table salt. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/78c67bc9-cdff-44b8-b61d-e44a9f9f0e4d_1280_720_base.png Ionic bonds Atoms interact with each other through the formation of chemical bonds. One type of chemical bond is an ionic bond. Ionic bonds result from the attraction between oppositely charged ions. For example, sodium cations (positively charged ions) and chlorine anions (negatively charged ions) are connected via ionic bonds in sodium chloride, or table salt. https://cdn.kastatic.org/ka-youtube-converted/FaeAurHnQJs.mp4/FaeAurHnQJs.mp4 250 Types of chemical bonding https://www.khanacademy.org/science/ap-biology/chemistry-of-life/introduction-to-biological-macromolecules/v/covalent-bonds 2023-12-18T19:15:22.874322042Z Covalent bonds Covalent bonds involve shared electron pairs between atoms. Each atom contributes one electron to each shared pair, and effectively gains an additional electron from the shared pair. Atoms share the same number of pairs needed to fill their valence shell, usually with eight. Hydrogen only needs one additional electron to fill its valence shell, so it shares only one pair. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/c5b45032-3e0e-4dc5-bfbe-fbeb4412d879_1280_720_base.png Covalent bonds Covalent bonds involve shared electron pairs between atoms. Each atom contributes one electron to each shared pair, and effectively gains an additional electron from the shared pair. Atoms share the same number of pairs needed to fill their valence shell, usually with eight. Hydrogen only needs one additional electron to fill its valence shell, so it shares only one pair. https://cdn.kastatic.org/ka-youtube-converted/kS5iU4v0QZk.mp4/kS5iU4v0QZk.mp4 343 Types of chemical bonding https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:chemical-bonding/x2613d8165d88df5e:metallic-bonds/v/metallic-bonds 2022-09-07T08:21:01.673602243Z Metallic bonds Metallic bonds result from the electrostatic attraction between metal cations and delocalized electrons. The nature of metallic bonding accounts for many of the physical properties of metals, such as conductivity and malleability. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/b52beab7-a6d1-467a-8cc4-61e9260a5ca5_1280_720_base.png Metallic bonds Metallic bonds result from the electrostatic attraction between metal cations and delocalized electrons. The nature of metallic bonding accounts for many of the physical properties of metals, such as conductivity and malleability. https://cdn.kastatic.org/ka-youtube-converted/N5MAFQlnu18.mp4/N5MAFQlnu18.mp4 180 Types of chemical bonding https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:chemical-bonding/x2613d8165d88df5e:metallic-bonds/v/predicting-bond-type-metals-nonmetals 2022-10-05T02:43:18.611402953Z Predicting bond type (metals vs. nonmetals) One way to predict the type of bond that forms between two elements is to consider whether each element is a metal or nonmetal. In general, covalent bonds form between nonmetals, ionic bonds form between metals and nonmetals, and metallic bonds form between metals. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/5ac7322b-62ed-4163-9c93-102d922a9848_1280_720_base.png Predicting bond type (metals vs. nonmetals) One way to predict the type of bond that forms between two elements is to consider whether each element is a metal or nonmetal. In general, covalent bonds form between nonmetals, ionic bonds form between metals and nonmetals, and metallic bonds form between metals. https://cdn.kastatic.org/ka-youtube-converted/B9GkAsd8EK8.mp4/B9GkAsd8EK8.mp4 312 Types of chemical bonding https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:states-of-matter/x2613d8165d88df5e:electronegativity-and-bond-polarity/v/predicting-bond-type-electronegativity 2022-09-07T08:21:01.673602243Z Predicting bond type (electronegativity) One way to predict the type of bond that forms between two elements is to compare the electronegativities of the elements. In general, large differences in electronegativity result in ionic bonds, while smaller differences result in covalent bonds. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/172bc99b-2295-4750-8af2-63b699b5023e_1280_720_base.png Predicting bond type (electronegativity) One way to predict the type of bond that forms between two elements is to compare the electronegativities of the elements. In general, large differences in electronegativity result in ionic bonds, while smaller differences result in covalent bonds. https://cdn.kastatic.org/ka-youtube-converted/AHUHpVQXRsw.mp4/AHUHpVQXRsw.mp4 283 Types of chemical bonding https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:molecular-and-ionic-compound-structure-and-properties/x2eef969c74e0d802:types-of-chemical-bonds/e/types-of-chemical-bonds 2023-08-07T17:25:22.494770007Z Types of chemical bonds Check your understanding of bond polarity and bond type in this set of free practice questions designed for AP Chemistry students. Lauren Rosebrugh exercise