Chemistry Unit 2 Part 2 - Changes in Matter

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Chemistry Unit 2 Part 2 - Changes in Matter

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

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