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level: Definitions

Questions and Answers List

Question	Answer
Matter whose composition does not change from one sample to another made of a single type of atom or molecule all samples have the same characteristics.	pure substance
Matter whose composition may vary from one sample to another two or more types of atoms or molecules combined in variable proportions composition varies, different samples have different characteristics.	mixture
Pure substances that cannot be decomposed into simpler substances by chemical reactions	elements
Substances that can be decomposed	compounds