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Physical & Chemical Changes

Physical & Chemical Changes. Physical. Physical Properties. Def: changes from one phase to another (solid, liquid, gas), without changing the substance Ex: Chopping, slicing, sawing, grinding, dissolving Melting/ Freezing Vaporizing (Boiling) Condensation Sublimation Evaporation.

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Physical & Chemical Changes

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  1. Physical & Chemical Changes

  2. Physical Physical Properties Def: changes from one phase to another (solid, liquid, gas), without changing the substance Ex: Chopping, slicing, sawing, grinding, dissolving Melting/ Freezing Vaporizing (Boiling) Condensation Sublimation Evaporation Physical Changes • Def: Properties that can be seen without changing the identity of the substance. • Ex: color, shape, hardness, odor, density, dissolvability, mass, weight, volume, texture

  3. Physical Change • A change in the physical property of a substance • The chemical properties remain the same • Ex: ice to water, carving wood…

  4. Any characteristic that can be observed or measured is a physical property. Length can be measured.

  5. Chemical Chemical Properties Def: Properties that describe how a substance changes into a new substance Ex: flammability (burning) Chemical Changes Def: The process by which a substance changes to a new substance Ex: Combustion (burning) Respiration Digestion Leaves changing color Rusting Photosynthesis Baking/cooking Gasoline burning Alka seltzer in water reacting

  6. Chemical Change • A substance is transformed into a newsubstance • Involves a chemical reaction • Ex. Iron rusting (with oxygen) to form iron oxide, chemical explosions, burning of wood

  7. Signs of a Chemical Change • Signs of a chemical change include the production of bubbles, heat, light, smoke, sounds or color changes.

  8. Example Chemical Reaction • Before During (fire,smoke) • After change

  9. Student Notes Page

  10. Properties Physical Properties Chemical Properties Def: Properties that describe how a substance changes into a new substance Ex: flammability (burning) • Def: Properties that can be seen without changing the identity of the substance. • Ex: color, shape, hardness, odor, density, dissolvability, mass, weight, volume, texture

  11. Changes Physical Changes Chemical Changes Def: The process by which a substance changes to a new substance Ex: Combustion (burning) Respiration Digestion Leaves changing color Rusting Photosynthesis Baking/cooking Gasoline burning Alka seltzer in water reacting • Def: changes from one phase to another (solid, liquid, gas), without changing the substance • Ex: • Melting • Freezing • Vaporizing (Boiling) • Condensation • Sublimation • Evaporation • Chopping, slicing, sawing, grinding, dissolving

  12. Demos

  13. Demo #1 Demo #5 Demo #2 Demo #6 Demo #3 Demo #7 Demo #4 Demo #8

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