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Understanding Physical and Chemical Changes in Substances

This educational guide covers the concepts of physical and chemical changes in substances. Learn about the differences between them, their signs, and how they can be induced. Discover how physical changes alter properties like size, shape, texture, color, and phases, while chemical changes create entirely new substances with different properties.

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Understanding Physical and Chemical Changes in Substances

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  1. Physical and Chemical Changes

  2. Physical Change • Anything that changes the physical properties of a substance • Size • Shape • Texture • Color** • Luster • Phases/States • ETC

  3. How To Cause Physical Changes • Size • Cutting • Breaking • Stretching • Shape • Cutting • Sanding • Breaking • Texture • Sanding • Scratching • Color** • Painting • Coloring with Markers • Luster • Sanding • Phases • Any Phase Change • Mixing • Taking two Substances and Mixing them Together

  4. Chemical Change • Causes a NEW SUBSTANCE to be formed! • New substance has NEW properties DIFFERENT from original substance

  5. Signs of a Chemical Change • Energy Released • Heat • Light • Sound • UV / Microwaves / Radiation / Gamma Rays / ETC • Formation of a Gas • Bubbles • Foam • Color Change ** • “Rusting” • Bleaching • Rotting

  6. More Signs of Chemical Reactions • Change in Temperature • Exothermic Reaction • To GIVE OFF heat • Substance gets WARM or HOT (Increase in Temperature) • Endothermic Reaction • To TAKE IN heat • Substance gets COOL or COLD (Decrease in Temperature) • Formation of a Solid • Precipitate

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