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12/9/11

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12/9/11

  1. 1. 12/12 B DayLEQ: How can we use density to tell ifan element is pure?1. What is one element that has similarproperties to hydrogen?2. Would you expect sodium (Na) to bemalleable?3. Why or why not? (Explain your answer!)4. Would you expect xenon (Xe) to be ductile?5. Why or why not? (Explain your answer!)
  2. 2. Today’s LEQ: How can we use density to tell if an element is pure?By the end of today, you should be able to…1. SOLVE to find the density of an object using the density equation.2. Use data on density to determine if an element is pure
  3. 3. Focus Vocabulary:77. Mass78. Volume
  4. 4. Activating Strategy14-carat 24-caratWhich ring would you rather have?
  5. 5. Draw this in your notes: =
  6. 6. Draw this in your notes:MASS = how muchmatter is in an object(how many ATOMSare in something) =
  7. 7. Draw this in your notes:MASS = how muchmatter is in an object(how many ATOMSare in something)VOLUME = how =much space an objecttakes up (how BIG isthe object?)
  8. 8. Volume: how much space an object takes up
  9. 9. Draw this in your notes:MASS = how muchmatter is in an object DENSITY(how many ATOMS (how manyare in something)VOLUME = how = atoms there are in a certainmuch space an objecttakes up (how BIG is space)the object?)
  10. 10. More Dense Less Dense
  11. 11. BrainPop: Density
  12. 12. MASS = grams (g)VOLUME = milliliters (mL) OR 3centimeters cubed (cm )DENSITY = grams per milliliter(g/mL) OR grams per centimeter 3cubed (g/cm )
  13. 13. SOLVE: D= MMass: 15 g VVolume: 3 mL 15 g = 5 g/mL 3 mL
  14. 14. SOLVE:Mass: 24 g 3Volume: 4 cm 24 g 3 3 = 6 g/cm 4 cm
  15. 15. SOLVE:Density: 4 g/mLMass: 12 g WHAT NOW?! 12 g = 4 g/mL ?
  16. 16. Density Triangle: M ÷ ÷ D V x
  17. 17. How to use the triangle… 1. When given mass and volume: D 2. When given mass and density:÷ M V= S D 3. When given density and volume: x D×V=M
  18. 18. SOLVE:4 g/mL12 g 12 g 12 g =V 4 g/mL 4 g/mL V = 3 mL
  19. 19. SOLVE:16 g4 mL 16 g 16 g =S 4 mL 4 mL S = 4 g/mL
  20. 20. SOLVE:8 g/mL4 mL 4 mL x 8 g/mL = M M = 32 g 4 mL 8 g/mL
  21. 21. 1. 200 g 3 4,000 cm2. 100 g 0.8 g/mL3. 625 mL 0.64 g/mL4. 16,000 g 625 cm 3 35. 150 g 0.75 g/cm
  22. 22. LAB TIME!Using a triple beam balance scale:http://www.youtube.com/watch?v=jknT_OKb6yM
  23. 23. LAB TIME!1. Write the formula for density2. Fill in the density triangle3. Use the scale to measure and record the MASS of each object4. Use your calculator to calculate the density or the volume of each object (don’t forget the units!)
  24. 24. EVERY ELEMENT HAS ITS OWN UNIQUE DENSITY!
  25. 25. WE CAN USEDENSITY TO IDENTIFYELEMENTS!
  26. 26. HOT Q:Unknown substance:Mass: 12.96Volume: 4.8 2.7Density:________What is the unknown substance?!ALUMINUM!
  27. 27. Summarizer: 3Density of pure gold: 19.3 g/cmDensity of a 14-carat gold ring: Mass: 157 g 3 Volume: 13.8 cm Is 14-carat gold pure gold? Why or why not?!

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