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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A chemical reaction is a process where substances, called reactants, rearrange their atoms to form new substances, known as products. No atoms are lost or gained—just rearranged. Evidence of a reaction includes color changes, gas production, or energy changes. In a closed system, the total mass of reactants and products remains the same.

00:00 Intro
00:28 Physical changes recap
01:08 How do chemical changes produce new stuff?
02:31 Reactants & products
03:46 Summary

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