https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:atoms-elements-and-compounds/x8bc8fb44369617ed:elements-compounds-and-mixtures/v/compounds-and-chemical-formulas 2025-01-16T17:32:17.772857468Z Compounds and chemical formulas Some substances, like copper or gold, are pure elements. Others, like water (H₂O), are compounds—made from two or more elements in fixed ratios, chemically bonded. Each compound has a unique formula, like CO₂ for carbon dioxide, representing its specific atomic arrangement. Compounds form molecules, tightly bonded units, creating an incredible diversity of substances in nature. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/e3e4181e-5236-462c-82b7-64099d59b95c_1280_720_base.png Compounds and chemical formulas Some substances, like copper or gold, are pure elements. Others, like water (H₂O), are compounds—made from two or more elements in fixed ratios, chemically bonded. Each compound has a unique formula, like CO₂ for carbon dioxide, representing its specific atomic arrangement. Compounds form molecules, tightly bonded units, creating an incredible diversity of substances in nature. https://cdn.kastatic.org/ka-youtube-converted/36nlbUdRvUM.mp4/36nlbUdRvUM.mp4 361 Compounds and molecules https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:atoms-elements-and-compounds/x8bc8fb44369617ed:elements-compounds-and-mixtures/a/compounds-and-chemical-formulas 2026-04-29T07:20:45.495372596Z Learn and try: Molecules, compounds, and chemical formulas Learn about how different elements combine to form compounds with entirely new properties and how these compounds can exist as molecules or crystals. article https://www.khanacademy.org/science/grade-7-science-tx/xe25057200abc6bd6:elements-and-compounds/xe25057200abc6bd6:compounds-and-molecules/e/apply-compounds-and-chemical-formulas-7th-teks 2026-06-30T14:20:41.927190319Z Apply: compounds and chemical formulas Apply your understanding of compounds and chemical formulas in this set of free, standards-aligned practice questions. Donna Fig exercise