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When a reaction makes a gas, what happens to the atoms and to the mass?

Chemistry · Years 11–12 · Full version

Open its page: Conservation of mass
A plastic bottle, sealed with its cap, stands on a balance reading 20.00 g. It holds hydrogen peroxide solution, with a catalyst at the bottom. Molecules drawn: hydrogen peroxide, 4; water, 0; oxygen, 0, all inside the bottle. Atoms drawn in the bottle now: 8 hydrogen and 8 oxygen; at the start: 8 hydrogen and 8 oxygen.

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How a lesson runs.

One sample lesson, from watching to working on your own. Try one of its questions: choose an answer, check it, or ask for a hint.

  1. Get readyCheck tens and ones first
  2. Watch52 + 36, worked by splitting
  3. Together43 + 20 bottle tops
  4. With help41 + 37, step by step
  5. On my own14 questions, three hints each
  6. Error review5 common errors to look out for

On my own · Question 13 of 14

Rhea works out 43 + 20 and writes 65. Which of these is her mistake?

Common error

Check the right answer and this card names the mistake the question looks for, with its fix.

Adds two-digit numbers with and without regrouping · Starting · Years 1–2

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Explore five complete Year 11 and 12 lessons.Physics, Chemistry, Biology, English and Mathematics · full working and four print editions

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