Physical vs. Chemical Changes in Matter

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Presentation transcript:

Physical vs. Chemical Changes in Matter How can we change the properties of a substance?

Physical Change Change in the physical properties of a substance Examples Crushing or breaking apart a substance Change of state Ice → water → water vapor Dissolving a substance in a solvent NO change in composition Substance retains its original properties

Chemical Change When 2 or more materials react and create new materials Example – Baking Mix together many ingredients When you bake them, they form a completely new substance New material has DIFFERENT PROPERTIES from those of the original substance(s) Can not regenerate original materials

Evidence of chemical change Complete change in color Change in odor Formation of a solid (precipitate) Formation of a gas (bubbles) Release or absorption of heat energy

Evidence of a chemical change Example Change in color When bleach is added to the dye on a jacket a noticeable color change happens. Change in odor When a match is struck, the substances in the match react a give off a distinctive odor Formation of a solid or gas When vinegar is added to baking soda a carbon dioxide gas is formed. Release or absorption of heat energy When gas is burned heat is released.

Chemical or Physical Change?