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Why can a safe sealed process become warmer or cooler?

Show of hands — before you project anything

Predict first: two liquids at the exact same room temperature get mixed. Do you think the thermometer can only stay the same, or could it move? Which way?

  • A Way more than you'd guess
  • B About what you'd guess
  • C Way less than you'd guess

Count the votes out loud. Hold them to it — then watch.

Project it (fullscreen)

Discussion prompts

  • Predict first: two liquids at the exact same room temperature get mixed. Do you think the thermometer can only stay the same, or could it move? Which way?
  • Predict first: a cold-pack gets icy without anything cold inside. Where do you think the coldness comes from?
  • If mixing made the cup hotter, did the reaction make brand-new energy — or let out energy that was already there? How could you tell?

Where it shows up in real life

  • A snap-and-shake hand-warmer that heats your pockets in winter
  • An instant cold-pack from a first-aid kit that turns icy when you squeeze it
  • Baking soda stirred into vinegar, which fizzes and feels slightly cool

A prediction-first worksheet — no answer key.

zero prep · no login · any projector

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