Classification of Matter
Matter is anything that has mass and volume is matter. <ref name="Classification of Matter">http://www.fordhamprep.org/gcurran/sho/sho/lessons/lesson14.htm</ref>
According to Linus Pauling, substances are "homogeneous species of matter with reasonably definite chemical composition." Substances only containing the same item are called pure substances. The two types are elements and compounds.
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