Chemistry

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

More Questions from Chemistry
What is known as the energy required to start a chemical reaction?
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An atom of which of the following elements has the smallest volume?
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What element is used in manufacturing cans, foils and kitchen utensils, pipes, and window frames?
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What was Avogadro's number?
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What symbol appears on the periodic table for the element with the atomic number 96?
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What volume does 24 grams of ammonia gas occupy at standard temperature and pressure?
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What kind of gas is CO2?
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What is the center of an atom called?
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