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Unformatted text preview: hysical changes are those that take place with no
change in chemical composition. Changes of a substance from one state of matter to another do not change its
chemical composition and are examples of physical changes. The three forms of water we call ice, liquid water,
and steam are all the same substance, just different physical states.
Chemical properties most often are descriptions of reactions that a substance undergoes when brought in
contact with other substances. In a chemical reaction the original substance or substances are changed into new
substances. When sodium metal and chlorine gas are heated together, a white solid called sodium chloride is
formed. That this is a chemical change is evident by the observation that sodium, a shiny metal, and chlorine, a Back Forward Main Menu TOC Study Guide TOC Textbook Website MHHE Website Chemistry: The Study of Change / 3
pale yellow green gas, have disappeared and in their place is a substance with a completely new set of properties.
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This note was uploaded on 09/15/2009 for the course CHEM 102 taught by Professor Bastos during the Spring '08 term at Adelphi.
- Spring '08