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Heating water: when does it boil?

Watch the thermometer while water turns into steam — a change of state.

Topic: First chemistry (grades 7–8)Grade: 7Free

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What you do

  1. Press “Heat” under the tube (speed ×5 helps). Watch the temperature rise.
  2. Keep heating until the water boils: bubbles of steam form inside the liquid.
  3. Read the thermometer: pure water boils at about 100 °C. Is boiling a physical or a chemical change?

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