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Physical Changes in Matter

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Physical Changes in Matter change in a substance that doesn t change the identity of the substance Ex. grinding, cutting, melting, boiling Includes all changes of ... – PowerPoint PPT presentation

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Title: Physical Changes in Matter


1
Physical Changes in Matter
  • change in a substance that doesnt change the
    identity of the substance
  • Ex. grinding, cutting, melting, boiling
  • Includes all changes of state (physical changes
    of a substance from one state to another)

2
Solid
  • definite volume
  • definite shape
  • atoms are packed together in fixed positions
  • strong attractive forces between atoms
  • only vibrate in place

3
Liquid
  • definite volume
  • indefinite shape
  • atoms are close together
  • atoms can overcome attractive forces to flow

4
Gases
  • indefinite volume
  • indefinite shape
  • atoms move very quickly
  • atoms are far apart
  • pretty weak attractive forces

5
Changes of State
6
Plasma
  • high temperature state in which atoms lose their
    electrons
  • Ex. the sun

7
Chemical Changes in Matter
  • a change in which a substance is converted into a
    different substance
  • same as chemical reaction
  • doesnt change the amount of matter present
  • reactants- substances that react
  • products- substances that form

8
Energy Changes in Matter
  • when any change occurs, energy is always involved
  • energy can be in different forms (light, heat,
    etc.)
  • energy is never destroyed or created (law of
    conservation of energy)

9
Energy Changes in Matter
  • Exothermic Reaction- reaction that gives off
    energy (feels warm on outside)
  • Endothermic Reaction- reaction that uses up
    energy (feels cold on outside)
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