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When water boils, the bonds holding the water molecules together as a liquid (intermoleular forces) are broken, and the molecules are allowed to escape as a gas (vapor, steam). So, this is simply a change in state, or a physical (not chemical) change.

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7y ago
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13y ago

When a liquid is heated, the particles are given more energy. They start to move faster and further apart. At a certain temperature, the particles break free of one another and the liquid turns to gas. This is the boiling point. The boiling point of a substance is always the same; it does not vary.

The thermal energy transforms into kinetic energy.

Think about it. If you touch cold water, it feels cold because the atoms are moving slowly. However, if you touch hot water then it feels hot because the atoms are moving all over and colliding with your fingers.

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13y ago

A change of phase: from liquid water to gaseous (vapours) water.

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Q: What happens to water molecule when water boils?
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