Author: Khan Academy via YouTube
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Our new middle school chemistry course launches in July 2025, but we couldn’t wait to share it! Videos like this one are rolling out over the next few months to give you a sneak peek of what’s to come. 🧪💡

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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.

00:00 Intro
00:30 Compounds & elements
01:40 Compounds & molecules
03:00 More examples of compounds
03:58 Chemical formulas of compounds
05:36 Summary

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