https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:chemical-bonding/x2613d8165d88df5e:covalent-bonds/a/molecules-salts-compounds-and-chemicals-what-s-the-difference 2026-04-27T10:30:47.716252349Z Learn and try: Molecules, salts, compounds, and chemicals: What's the difference? Learn how to describe different chemical substances. article https://www.khanacademy.org/science/class-9-chemistry/x46dd29ce84a663ea:atoms-and-molecules/x46dd29ce84a663ea:molecules-and-ions/a/paul-article-2 2021-04-29T08:00:35Z Molecules and compounds Compounds can be classified as ionic or covalent. Molecules are the simplest unit of a covalent compound, and molecules can be represented in many different ways.  article https://www.khanacademy.org/science/bridge-course-class-11th-chemistry/x426c9d2c554669cb:basic-concepts-of-chemistry/x426c9d2c554669cb:ionic-compounds/v/worked-example-formula-for-an-ionic-compound 2023-06-26T12:36:08.867767149Z Worked example: Formula for an ionic compound Let's understand how to write the formula for ionic compounds! Vibhor Pandey video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Worked example: Formula for an ionic compound Let's understand how to write the formula for ionic compounds! https://cdn.kastatic.org/ka-youtube-converted/rjsx6MP0Vos.mp4/rjsx6MP0Vos.mp4 211 Structures of ionic and covalent compounds https://www.khanacademy.org/science/bridge-course-class-11th-chemistry/x426c9d2c554669cb:basic-concepts-of-chemistry/x426c9d2c554669cb:ionic-compounds/e/naming-ionic-compounds 2026-03-29T17:54:23.483136198Z Naming ionic compounds Practice naming ionic compounds when given the formula Yuki exercise https://www.khanacademy.org/science/bridge-course-class-11th-chemistry/x426c9d2c554669cb:basic-concepts-of-chemistry/x426c9d2c554669cb:ionic-compounds/e/find-the-formula-for-ionic-compounds 2025-02-06T18:17:42.147590351Z Find the formula for ionic compounds Practice finding the formula when given the name of an ionic compound. Yuki exercise