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Introduction to Density Day 2

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Introduction to Density Day 2

  1. 3. Quick Review <ul><li>The metric unit for mass is? </li></ul><ul><li>What effects the mass of a substance? </li></ul><ul><li>If the volume is different for two pieces of Silver will the mass be different? Why? </li></ul><ul><li>If you have two pieces of Calcium with the same volume will their masses be different? Why? </li></ul><ul><li>If you have a piece of Platinum and a piece of Gold with the same volume will their density be the same? Why? </li></ul>
  2. 4. Quick Review <ul><li>If you have a unit label of kg/m 3 what kind of number do you have? </li></ul><ul><li>What are at least 2 volume units? </li></ul><ul><li>Same or different densities? Why? </li></ul><ul><li>What is the mass? </li></ul>Magnesium Magnesium
  3. 5. Quick Review <ul><li>What is volume? </li></ul><ul><li>What unit can identify a density number? </li></ul><ul><li>Same or different densities? Why? </li></ul><ul><li>What is the significant difference between a physical & chemical change? </li></ul><ul><li>When will a substance float in water? </li></ul>Copper Brass
  4. 6. Copy chart onto Cornell Notes Sample Chemical Symbol Density g/cm3 Physical Attribute Lead Pb 11.3 Heaviest Mass Copper Cu 8.9 Orange Iron Fe 7.9 Magnetic/Rusts Brass Cu & Zn 8.6 Yellow Aluminum Al 2.7 Lightest Mass Zinc Zn 7.1 Dull Gray
  5. 7. Substance Mass g Volume cm 3 Density g/cm 3 4. Cube 1 5. Cube 2 6. Cube 3 <ul><li>Cube 4 </li></ul>8. Cube 5 9. Cube 6
  6. 8. Density Problems <ul><li>Identify the type of numbers you have. (unit labels) </li></ul><ul><li>Understand what the problem is asking. </li></ul><ul><li>It is a one step problem or two step problem ? </li></ul><ul><li>Which formula should you use? </li></ul>
  7. 9. The following formulas are for finding different variables in density problems. Density Formulas m m v D = = = D v x m D v
  8. 10. <ul><ul><li>Please Circle EITHER Same or Different ….then complete the Sentence. </li></ul></ul>
  9. 11. Answer in complete sentences : 8. How is Density useful in identifying substances? Explain why a substance, such as gold, cut into different sizes, would have the same density.
  10. 12. Sample Chemical Symbol Density g/cm3 Physical Attribute Aluminum Al 2.7 Not Heavy Copper Cu 8.9 Orange Methane CH 4 .668 Strong Odor Gold Au 19.3 Yellow Ice H 2 0 .917 Crystalline Iron Fe 7.8 Rusts Lead Pb 11.3 Very Heavy Seawater H 2 0 + 1.4 Heterogeneous Wood (average value) Cellulose 0.8 Can Float
  11. 13. <ul><li>Introduction to Density + Problems due tomorrow. </li></ul><ul><li>Correct/ Signature on Test #2 – Due Friday </li></ul><ul><li>End of the Quarter is Friday. </li></ul>

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