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...Regents chemistry topic review packet name table of contents matter its properties changes outline practice questions atomic concepts periodic formulas names equations moles molar mass types reactions bonding overview a heat temperature b kinetics equilibrium water solutions acids bases organic phases gases electrochemistry oxidation reduction answer key and is classified as pure substance or mixture substances element compound has constant composition throughout given sample from to you can use particle models diagrams differentiate among elements compounds mixtures the proportions components in be varied each component retains original differences such density size molecular polarity boiling point freezing solubility permit physical separation methods separating include evaporation filtration distillation chromatography homogeneous heterogeneous are always things like soil fruit salad where not uniform structure arrangement particles their interactions determine state at pressure kno...