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  • When you freeze water it is called

    • When water is changed into ice it.

    Melting and freezing

    Water can exist as a solid (ice), liquid (water) or gas (vapour or gas).

    Why does water behave the way it does when it freezes

    Adding heat can cause ice (a solid) to melt to form water (a liquid). Removing heat causes water (a liquid) to freeze to form ice (a solid). When water changes to a solid or a gas, we say it changes to a different state of matter.

    Even though the water’s physical form changes, its molecules stay the same.

    Water is a molecule

    A molecule is a group of two or more atoms that bond or ‘stick’ together. Water is a molecule.

    Water changing into ice is an example of which change

  • Water vapour to ice is called
  • When water is changed into ice it
  • What is the process of changing water into ice called
  • What is freezing

    • It is made up of two hydrogen (H) atoms and one oxygen (O) atom that are chemically bonded together. The H and O are symbols for the atoms that make up water. This is why people often refer to water as H2O. Water can change from a liquid to a solid or a gas and back to a liquid, but its molecules always stay the same.

    A water molecule is always H2O whether it is liquid water, ice or water vapour.

    Nature of science

    Numerous everyday words, like energy, have a different meaning in science. We talk about running out of energy during a race or children having t

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