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Physical and Chemical Changes

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Physical and Chemical Changes How does the object change? What is Change? Change: the act of altering a substance Physical Change Physical change: a change that ... – PowerPoint PPT presentation

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Title: Physical and Chemical Changes


1
Physical and Chemical Changes
How does the object change?
2
What is Change?
  • Change the act of altering a substance

3
Physical Change
  • Physical change a change that occurs that does
    not change the identity of the substance
  • Melting ice(change in state or phase) Beverly?
  • Freezing Kool-aid
  • Tearing paper
  • Boiling water (same as melting ice)Beverly?
  • Change of State

4
Chemical Changes
  • Chemical change a change that occurs causing
    the identity of the substance to change
  • Burning
  • Digesting food
  • Reacting with other substances
  • A chemical change is called a chemical reaction

5
Chemical Changes Contd
  • Indicators of a chemical change
  • Evolution of light
  • Evolution of heat
  • Evolution of a gas
  • Color change
  • Formation of a precipitate

6
Is it Physical or Chemical?
Change Physical Chemical
Melting cheese
Burning wood
Milk souring
Wadding up paper
Bicycle rusting
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