Chemistry Unit 2 Part 2 - Changes in Matter
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Chemistry Unit 2 Part 2 - Changes in Matter

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Chemistry Unit 2 Part 2 - Changes in Matter Presentation Transcript

  • 1. Matter and Change Part 2 – Changes in Matter
  • 2. TAKS Student Expectation
    • 11.8 Integrated Physics and Chemistry (8) Science Concepts. The Student knows that changes in matter affect everyday life. The student is expected to:
      • (A) distinguish between physical and chemical changes in matter such as oxidation, digestion, changes in state and in the rock cycle
    • Here’s what you have to do if you want to pass this part of the TAKS:
    • Look at an observed change and know if it was physical or chemical.
    • Know what the heck a rock cycle is!
    • Know what “oxidation” means.
    • Understand the basic ideas of digestion.
  • 3. Physical Change
    • A change in the physical appearance of a substance that does not change the identity of the substance.
    LIQUID SOLID GAS
  • 4. Physical Changes
    • Phase Change – physical change from one state to another
    LIQUID Between 0°C and 100 0°C SOLID Below 0°C GAS Above 100°C Only the temperature changes Still H 2 O in every form!!!
  • 5. Physical Changes
    • Examples of physical changes:
    • Crushing an aluminum can
    • Cutting your hair
    • Shredding paper
  • 6. Sample Question Source: Spring 2006 TAKS
  • 7. Chemical Changes
    • Chemical changes, or chemical reactions, occur when one or more substances is converted into another substance.
    • Original atoms are preserved
    • New substances are formed
    • Different chemical composition than original substance
  • 8. Chemical Changes
    • Chemical changes are chemical reactions.
    • Indicated by a number of signs
    • formation of a gas,
    • formation of a solid, or precipitate
    • change in temperature
    • evolution of heat and light
    • Change in color
    • Change in odor
  • 9. Chemical Changes
    • When iron (Fe) rusts, you can see it happen over a long period of time.
    • The actual iron molecules change their structure as they react with oxygen and are oxidized.
  • 10. Chemical Changes
    • Examples of chemical changes:
    • Grass growing
    • Frying an egg
  • 11. Sample Question Source: Spring 2004 TAKS
  • 12. The Rock Cycle
    • Lets Look at each part of the rock cycle and
      • Which areas involve chemical change?
      • Which areas involve physical change?
  • 13. Sample Question Source: Spring 2004 TAKS
  • 14. Sample Question Source: Spring 2003 TAKS
  • 15. Digestion
    • Lets Look at each part of the digestion
      • Which areas involve chemical change?
      • Which areas involve physical change?
  • 16. Sample Question Source: Spring 2004 TAKS