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Physical and Chemical Changes

Physical and Chemical Changes. Physical Change. Definition: The object changes, but the substances that make –up an object (composition) remain the same. You have the same substance before and after the change. Nothing new has been created. Physical Change – Change in State of Matter .

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Physical and Chemical Changes

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  1. Physical and Chemical Changes

  2. Physical Change • Definition: • The object changes, but the substances that make –up an object (composition) remain the same. • You have the same substance before and after the change. Nothing new has been created.

  3. Physical Change – Change in State of Matter • objects changes from one state to another (solid to liquid, liquid to gas) • Examples: ice cream melting, water boiling, water evaporating, ice forming

  4. Physical Change – Change in Size or Shape • object is torn, cut, wrinkled, bent, dissolved, stretched • Examples: tearing paper, dissolving sugar into tea, stretching a rubber band, denting metal

  5. Chemical Change • Occurs when the make-up an object (composition) have been changed • The atoms rearrange to make something new • Change is difficult to reverse

  6. Chemical Change: Color Change • A new color is formed • Example: apple turns brown, iron turns red when it rusts, bleach changes color of clothes

  7. Chemical Change - Temperature • 2 objects combine and produce an increase or decrease in temperature • Examples: Wood burns to ashes

  8. Chemical Change: Formation of a Precipitate • 2 liquid objects are combined to form a solid.

  9. Chemical Change: Formation of Gas • When a solid and a liquid object are combined and a gas is formed • Bubbles indicate the presences of a gas • Examples: vinegar and baking soda are combined, CO2 is made

  10. These are NOT chemical changes! • Water boiling in a pot • Water heated • Food coloring added.

  11. Physical or Chemical? • Digesting Food • Ice melting • Formation of rust • Crushing a soda can • Log burning • Cutting paper

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