1/4/12

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1/4/12

  1. 1. 1/4/12 A/B DayLEQ: How can we use physical propertiesto identify different substances?1. What does the word “malleable” mean?2. Which elements do we consider malleable:metals, nonmetals, or metalloids?3. Is aluminum malleable?4. A scientist wants to do an experiment and heneeds something that is a conductor. Should hepick a metal, a nonmetal, or a metalloid?5. Explain your answer to number 4!!!
  2. 2. AGENDA:1. Quick Chemistry Review2. Lecture (Notes, Videos, and Demos)3. Practice today’s material4. Summarizer5. Finish Review Stations
  3. 3. Lets Review: WRITE THIS IN YOUR NOTES!1. MALLEABLE:2. DUCTILE:3. CONDUCTOR:4. INSULATOR:5. MAGNETIC:
  4. 4. SORT IT OUT!!!
  5. 5. EOG QUESTION:What characteristic of aluminum allows itto be made into aluminum foil?a. It is denseb. It is ductilec. It is magneticd. It is malleable
  6. 6. Today’s LEQ: How can we use physical properties to identify different substances?By the end of today, you should be able to…1. Explain the difference between a boiling point and melting point specific heat, and solubility2. Define specific heat3. Define solubility4. Identify substances with these properties
  7. 7. FOCUS VOCABULARY75. Boiling Point76. Melting Point77. Specific Heat
  8. 8. Physical Characteristics:
  9. 9. COPY THIS IN YOUR NOTES:BOILING POINT: MELTING POINT: PHYSICALSOLUBILITY: PROPERTIES SPECIFIC HEAT
  10. 10. BOILING POINT: Thetemperature where aliquid changes to a gas-Ex: Water turns towater vapor at 100 ° C
  11. 11. Water is turningfrom a liquid to agas at 100 ° C
  12. 12. DEMO:Beaker 1: Beaker 2:100 mL of water 500 mL of water1. Which one took LONGER to boil?2. At what TEMPERATURE didBeaker 1 boil?3. At what TEMPERATURE didBeaker 2 boil?
  13. 13. HOT Q!!A beaker with 100 mL of water isplaced on a hot plate and heated.The water boils at 100°C. Atwhat temperature would 90mL of water boil?
  14. 14. MELTING POINT: Thetemperature where asolid changes to a liquid-Ex: Ice turns to waterat 0° C (32 ° F)
  15. 15. Water is turning from asolid to a liquid at 0 ° C(32 ° F)
  16. 16. DEMO:
  17. 17. HOT Q:WHICH ONE DO YOU THINK HASTHE HIGHEST MELTING POINT? WAX GOLD ICE
  18. 18. VIDEO:Boiling, Melting, Freezing, and Sublimation(Discovery Ed)
  19. 19. BOILING POINT ANDMELTING POINT CAN BE USED TO IDENTIFY ELEMENTS AND COMPOUNDS!
  20. 20. MYSTERY Melting Point1) Boiling Point3) SubstanceSUBSTANCE: - Tm - - Tb - (1 atm) (K) (K)BOILS at 630degrees Hydrogen 13.8 20.3 Oxygen 54.4 90.2MERCURY! Nitrogen 63.3 77.3 Ethyl Alcohol 156 351MYSTERY Mercury 234 630SUBSTANCE:MELTS at 1,359 Water 273.15 373.15degrees Lead 600 2,023 Aluminum 932 2,740 COPPER! Gold 1,336 2,933 Copper 1,359 1,460 Iron 1,808 3,023
  21. 21. SPECIFIC HEAT: amount ofheat needed to raise 1gram of something by 1degreeEx: Low S.H. = easy to heat High S.H. = hard to heat
  22. 22. VIDEO: SPECIFIC HEATSpecific Heat capacity(Discovery Ed)
  23. 23. Specific Heat Chart: HIGH SPECIFIC HEAT: Hard to heat up (takes a lot of heat to get hot!) LOW SPECIFIC HEAT: Easy to heat up! (Doesn’t take a lot of heat to get hot!)
  24. 24. Specific Heat Chart: IN YOUR NOTEBOOK… LIST these elements from EASIEST to heat to HARDEST to heat!
  25. 25. LETS PRACTICE!!! Use the chart provided to answer questions 1-20 in your notebook.(Complete sentences NOT required) Let’s check our answers…
  26. 26. SUMMARIZER:1. What is the difference between a boiling point and a melting point?2. What is specific heat?3. How can we use boiling points, melting points, and specific heat to identify different substances?
  27. 27. FINISH REVIEW STATIONS!
  28. 28. SOLUBILITY: how much ofa substance dissolves inanother substance-Ex: We can only dissolvea certain amount of Kool-Aid mix into a cup ofwater.
  29. 29. DEMO
  30. 30. SOLUBILITY OF SUBSTANCESCHANGES WITHTEMPERATURE!!
  31. 31. Reading Solubility Graphs
  32. 32. HOT Q: If 10 grams of water boils at100 ° C, what temperature cause 50grams of water to boil?

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