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In a liquid or gases there must be forces

Between the molecules causing molecules to be attracted one to another; otherwise
they would move apart from each other and become a gas. These forces are called

They are much weaker than covalent, ionic or metallic bonds.…

Page 2

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Electrons are always moving really quickly, this leads to an uneven distribution if
charge. Therefore one atom becomes more negative than other and attracts more
electrons. This dipole can cause another dipole in the opposite direction on a
neighbouring atom and then two dipoles are attracted together.

Very weak bonds…

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