Ch Matter Properties & Changes in Matter (p )

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Ch. 18 - Matter Properties & Changes in Matter (p.560-567) Physical vs. Chemical Props. Physical vs. Chemical Changes

A. Physical vs. Chemical Props. Physical Property can be observed without changing the identity of the substance (describes appearance or behavior of substance) Chemical Property describes the ability of a substance to undergo changes in identity

B. Physical vs. Chemical Props. Examples: melting point flammability density magnetic tarnishes in air physical chemical

B. Physical vs. Chemical Changes Physical Change changes the form of a substance without changing its identity properties remain the same Chemical Change changes the identity of a substance substance(s) made (products) have different properties

B. Physical vs. Chemical Changes Signs of a Chemical Change change in color or odor formation of a gas formation of a precipitate (solid) change in light or heat

B. Physical vs. Chemical Changes Examples: rusting iron dissolving in water burning a log melting ice grinding spices chemical physical

Click on Einstein to see a short video on chemical/physical properties and changes.