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Experiment 12 — Where Did the Mass Go?

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Topic: Chemistry · Class 9 · Atoms and molecules: law of conservation of mass

Aim: Show that mass is conserved when baking soda reacts with vinegar.

Daily: A burning candle seems to lose mass and a rusting nail seems to gain it. Neither breaks the law — you simply have to weigh the gases too.

Question: Baking soda and vinegar react in an open beaker on a balance. The reading…

Exp: Mass is conserved overall, but the escaping gas leaves the balance pan.

Question: The law of conservation of mass was established by…

Exp: Dalton later explained it with atoms.

Question: A rusting iron nail gains mass because…

Exp: The oxygen must be counted too.

Question: A chemical equation is balanced so that…

Exp: Atoms are only rearranged, never destroyed.

All activities in Science Lab - Advance 2

  1. Part 2 — Chemistry
  2. Experiment 1 — Read the Motion Graph
  3. Experiment 2 — Stop Before the Cow
  4. Experiment 3 — Force, Mass and Acceleration
  5. Experiment 4 — The Recoiling Cannon
  6. Experiment 5 — Hammer and Feather
  7. Experiment 6 — Archimedes and the Crown
  8. Experiment 7 — Over the Hill
  9. Experiment 8 — Sound the Ocean Floor
  10. Experiment 9 — From Ice to Steam
  11. Experiment 10 — Solution, Colloid or Suspension?
  12. Experiment 11 — Unmix the Ink
  13. Experiment 12 — Where Did the Mass Go?
  14. Experiment 13 — Build an Atom
  15. Experiment 14 — The Potato Osmoscope
  16. Experiment 15 — Who Does What in the Cell?
  17. Experiment 16 — Name That Tissue
  18. Experiment 17 — Beat the Pests, Keep the Grain
  19. Experiment 18 — Run a Dairy

Practise for Class 9