Chemistry

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

More Questions from Chemistry
What alkaline earth metal is formed from the decay of uranium?
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Which of these compounds is insoluble in water?
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The dumping of most toxic chemicals into the ocean was banned by what treaty?
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What are the main two elements that undergo fusion to power the sun?
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What are the products of acid-base neutralization?
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What symbol appears on the periodic table for the element with the atomic number 100?
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In an ethyne molecule, what is the hybridization of each of the carbons?
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What is the chemical symbol for Potassium?
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