2 5 Physical and Chemical Changes Chemical Change

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2. 5 Physical and Chemical Changes

2. 5 Physical and Chemical Changes

Chemical Change A chemical change is any change where you change a substance chemically.

Chemical Change A chemical change is any change where you change a substance chemically. § A new substance is created § Example: Lighting a match

Evidence of a Chemical Changes occur when: Ø…there is a change in color Ø…

Evidence of a Chemical Changes occur when: Ø…there is a change in color Ø… there is a production of gas Ø… there is a formation of a precipitate

Physical Changes Physical Change- a change that takes place that does NOT change the

Physical Changes Physical Change- a change that takes place that does NOT change the substance chemically. Examples: haircut, ice melting

Physical Changes States of Matter Solids: Have a definite shape and a definite volume

Physical Changes States of Matter Solids: Have a definite shape and a definite volume ü Slow molecules, low energy Liquids: Definite volume but not a definite shape ü Medium energy molecules Gases: No definite shape, no definite volume ü Fast molecules, high energy

Phase Changes A phase change is a reversible physical change that occurs when a

Phase Changes A phase change is a reversible physical change that occurs when a substance changes from one state of matter to another. Energy is either absorbed or released during a phase change. § Endothermic – energy is absorbed § Exothermic – energy is released

Physical Changes Melting: Solid to liquid, endothermic

Physical Changes Melting: Solid to liquid, endothermic

Physical Changes Freezing: Liquid to solid, exothermic

Physical Changes Freezing: Liquid to solid, exothermic

Physical Changes Evaporation: Liquid to gas, endothermic

Physical Changes Evaporation: Liquid to gas, endothermic

Physical Changes Condensation: Gas to liquid, exothermic

Physical Changes Condensation: Gas to liquid, exothermic

Physical Changes Sublimation: Solid to gas, endothermic

Physical Changes Sublimation: Solid to gas, endothermic

Physical Changes Deposition: Gas to solid, exothermic

Physical Changes Deposition: Gas to solid, exothermic

Physical and Chemical Changes Physical Changes Physical changesPhysical and Chemical Changes Physical Changes Physical changes
Physical and Chemical Changes Physical Changes Physical changesPhysical and Chemical Changes Physical Changes Physical changes
Chemical and Physical Changes Physical Changes Physical ChangesChemical and Physical Changes Physical Changes Physical Changes
Physical and Chemical Changes Physical Changes Physical ChangePhysical and Chemical Changes Physical Changes Physical Change
Physical and Chemical Changes Physical Change Physical changesPhysical and Chemical Changes Physical Change Physical changes
Chemical and Physical Changes Chemical Changes Chemical changesChemical and Physical Changes Chemical Changes Chemical changes
Physical and Chemical Changes Physical Change Physical changePhysical and Chemical Changes Physical Change Physical change
Physical and Chemical Changes Physical Change Physical changePhysical and Chemical Changes Physical Change Physical change
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