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Matter can undergo changes.

Matter can undergo two types of changes: physical and chemical. Physical changes alter the physical properties of matter without changing its identity, meaning new substances are not produced. Examples include boiling water, freezing water, and melting ice. In contrast, chemical changes involve a change in the identity or composition of matter, resulting in the creation of new substances. Signs of chemical changes include color change, temperature change, gas production, and the formation of a precipitate. Examples include cooking an egg, baking a cake, and rusting steel.

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Matter can undergo changes.

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  1. Matter can undergo changes.

  2. Physical Changes • The Physical properties of matter can be changed WITHOUTchanging its identity or makeup . • New substances are NOTproduced. • Normally reversible

  3. Examples of Physical Changes • Boiling Water • Freezing Water • Melting Ice

  4. More Examples of Physical Changes Breaking a glass bottle Melting Butter Breaking an egg

  5. Matter can undergo changes.

  6. Chemical Changes • Chemical Changes occur when the identity or make-up (composition) of matter changes. • New substances are created. • The mass can’t be createdor destroyedbefore, during and after physical and chemical changes.

  7. Signs of a Chemical Change

  8. ColorChange

  9. Change in Temperature (Change in energy-heat, light)

  10. Production of Gas

  11. Production of Precipitate • A solid that separates out of solution during a chemical change is called a precipitate. 

  12. Examples of Chemical Changes Cooking an egg Baking a cake Steel rusting

  13. Examples of Chemical Changes Tarnishing Silver Digesting Food Rotting Food

  14. More Examples of Chemical Changes Fireworks Leaves changing colors Wood burning Bleaching Hair

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