Chemistry

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

More Questions from Chemistry
Which of the following carries a positive charge?
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What is the addictive chemical in cigarettes?
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When wood has been heated to remove almost all volatile gases and leave the carbon, it is called what?
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Phosphorus and sulfur are the ingredients in what?
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What symbol appears on the periodic table for the element with the atomic number 62?
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The ignition of materials stored in bulk is?
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What symbol appears on the periodic table for Unniloctium which has the atomic number 108?
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Which is a chemical often injected into lips for plastic surgery?
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