NGSS · Physical Science · Grades 6–8 (Middle School)

MS-PS1-5 Conservation of Mass in Chemical Reactions

Develop and use a model to describe how the total number of atoms does not change in a chemical reaction and thus mass is conserved.

Kentucky 7-PS1-5 uses the same wording.

Teach MS-PS1-5 with a mystery

Not One Atom Lost cover
Science Unlocked lesson set Not One Atom Lost Burn paper, and the ash left behind weighs much less. Burn a fluffy pad of steel wool, and it gets heavier! How can burning make one thing lighter and another heavier — and where does the extra mass come from? 1 week · $3.00 · Grades 6–8 See what’s inside
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BundleComing soonMatter & Chemical Reactions Bundle$12.50Gr 6–8
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More Physical Science standards

MS-PS1-1Atoms, Molecules & Extended StructuresPhenomenon: Pencil or Diamond?MS-PS1-2Chemical Reactions: Properties Before & AfterPhenomenon: The Fatberg FilesMS-PS1-3Synthetic Materials & Natural ResourcesPhenomenon: The Nylon RushMS-PS1-4States of Matter & Particle MotionPhenomenon: The Vanishing SpoonMS-PS1-6Thermal Energy: Exothermic & Endothermic DesignPhenomenon: Hot Meal, No FlameMS-PS2-1Newton's 3rd Law Collisions DesignPhenomenon: The Bouncing Lander