Chemistry

What makes matter expand when it's heated and contract when it's cooled?

More Questions from Chemistry
Reacting an alkene with water produces which of the following?
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What is known as the energy required to start a chemical reaction?
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What is the approximate heat of vaporization of water at its boiling point?
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What is H20 more commonly known as?
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What is the boiling point of water on the Celsius scale?
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What is an atom that has more electrons than normal referred to as?
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All of the halogens form acids when bonded to what element?
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What color is ozone gas?
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