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Physical Science: Chapter 3 sec3

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Notes from 10/04/10

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Physical Science: Chapter 3 sec3

  1. 1. Chapter 3, Sec 3 Chemical Properties Page 91 10/04/10
  2. 2. Warm Up 10/01/10 <ul><li>An object is measured using the displacement method. </li></ul><ul><li>The graduated cylinder measures 25mL of water before the object is added. </li></ul><ul><li>The cylinder measures 50mL after the object is added. </li></ul><ul><li>What is the volume of the object in cm 3 ? </li></ul>
  3. 3. Chemical Properties <ul><li>Property of matter that describes a substance’s ability to participate in a chemical reaction. </li></ul>
  4. 4. Reactivity <ul><li>The ability of a substance to change into one or more new substances. </li></ul><ul><ul><li>Flammability </li></ul></ul><ul><ul><ul><li>Wood has flammability (ability to burn) </li></ul></ul></ul><ul><ul><ul><li>Ash does not have flammability </li></ul></ul></ul>
  5. 5. Comparing Physical and Chemical Properties <ul><li>Physical property – can be observed without changing substance. </li></ul><ul><ul><li>Density, thermal conductivity </li></ul></ul><ul><li>Chemical property – substance needs to change to observe a chemical property. </li></ul><ul><ul><li>Wood needs to burn to know its flammable. </li></ul></ul>
  6. 6. Signs of a chemical change: <ul><li>If there is a change in the following it is most likely a chemical reaction: </li></ul><ul><ul><li>Color </li></ul></ul><ul><ul><li>Odor </li></ul></ul><ul><ul><li>Fizz and foam (creating gas) </li></ul></ul><ul><ul><li>Sound </li></ul></ul><ul><ul><li>Light </li></ul></ul><ul><ul><li>Sudden heat (or cold) </li></ul></ul>
  7. 7. Irreversible <ul><li>You can not un-burn a piece of paper, or un-rust a nail. (not easily) </li></ul>
  8. 8. Practice <ul><li>Chemical or Physical change? </li></ul><ul><li>___ Iron rusts </li></ul><ul><li>___ Sugar dissolved in water </li></ul><ul><li>___ Burning match </li></ul><ul><li>___ Cube of ice that melts </li></ul><ul><li>___ Water changing into steam </li></ul><ul><li>___ Sour milk </li></ul>
  9. 9. Homework <ul><li>Section Review: page 95, Numbers 1-5 </li></ul><ul><ul><li>Read Chapter 3: Section 3 </li></ul></ul>

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