Why do the properties change when a compound forms?

The properties of a compound depend not only on which atoms the compound contains, but also on how the atoms are arranged. Atoms of carbon and hydrogen, for example, can combine to form many thousands of different compounds. Sugar is a compound composed of atoms of carbon, hydrogen, andoxygen.

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

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