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Physical and Chemical Properties Lab

Explore the physical and chemical properties of different substances and solve a mystery using evidence and data collection.

jcynthia
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Physical and Chemical Properties Lab

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  1. September 5, 2018 • Warm Up: Take out data collection sheet from Friday’s Lighthouse Diamond Lab • Use information sheet to complete data table • Review your “Hot Suspects” list • Homework: USA Test Prep & online textbook work due Friday.

  2. Physical vs Chemical Properties • Physical properties can be observed without changing the identity of the substance • They include size, color, texture, solubility, malleability, ductility, conductivity, and magnetism • Chemical properties are observed by how a substance reacts with another substance • This changes the substance chemically • They include reactivity, combustibilityand flammability

  3. Sugar • Small crystals • Melts over heat (turns brown, then black) • Dissolves in water • Does not react to vinegar or iodine

  4. Salt • Small crystals • Does not melt over low heat • Dissolves in water • Does not react with vinegar or iodine

  5. Flour • Fine powder • Will brown and then burn over low heat (may smell like burnt toast) • Will not dissolve in water • Reacts to iodine by turning purple or black • Does not react to vinegar

  6. Cornstarch • Fine powder • Will brown and then burn over low heat (may smell like burnt popcorn) • Does not dissolve in water • Reacts to iodine by turning purple or black • Does not react to vinegar

  7. Plaster of Paris • Fine powder • Little reaction to low heat (may turn gray) • Does not dissolve in water • Does not react to vinegar or iodine

  8. Baking soda • Fine crystals/powder • Does not react to low heat • Dissolves in water • Does not react to iodine • Reacts to vinegar with bubbling and fizzing

  9. Next Steps • Identify your six mystery powders, A – F • Identify the thief's mystery powder • Using the clues from the “Hot Suspects” list and the evidence from your data table, determine who stole the Lighthouse Diamond • Complete your affidavit with a claim of who is guilty, evidence that supports this claim, and reason that your group believes this person is guilty • Make sure you mention physical & chemical properties to test the thief's powder! • Turn in the completed data table and the affidavit when complete

  10. September 5, 2018 • Warm-Up: Use the first 15 minutes of class to finish your insulating box • Be sure to clean-up after yourself! • Mystery items will be placed in boxes in 15 minutes • Work will be returned while you are working – keep it out for review • Homework: Study for test. Chapters 5 & 14 in the online textbook. Complete online assignments (textbook & USA Test Prep) by Friday (may need to upload when through).

  11. Test Standards: • SPS5. Obtain, evaluate, and communicate information to compare and contrast the phases of matter as they relate to atomic and molecular motion. • a. Ask questions to compare and contrast models depicting the particle arrangement and motion in solids, liquids, gases, and plasmas. • b. Plan and carry out investigations to identify the relationships among temperature, pressure, volume, and density of gases in closed systems. • SPS7. Obtain, evaluate, and communicate information to explain transformations and flow of energy within a system. • b. Plan and carry out investigations to describe how molecular motion relates to thermal energy changes in terms of conduction, convection, and radiation. • c. Analyze and interpret specific heat data to justify the selection of a material for a practical application (e.g., insulators and cooking vessels). • d. Analyze and interpret data to explain the flow of energy during phase changes using heating/cooling curves

  12. Returned work • Phase Change GIZMO – previously reviewed • Gas Law GIZMO – previously reviewed • Radiation Lab • Specific Heat Lab – previously reviewed • Gas Law quiz • Specific Heat quiz

  13. Radiation Lab • The black can should’ve heated up AND cooled off more • The primary type of heat transfer we observed was RADIATION (there was no contact between the lamp & the cans • The black can absorbed more heat and the silver can reflected more • This was NOT about conductors and insulators • Bestreasons connected the claim and evidence with the science idea that black absorbs more heat than silver.

  14. Specific Heat Quiz • Some partial credit was given

  15. 3-2-1 Reflection – complete sentences • Tell me THREE items you chose for your box and why. • Tell me TWO changes you would make if you did this again • Tell me ONE thing you learned about heat transfer in doing this activity • Draw a diagram illustrating heat transfer between your ice cream sandwich and the air in the room

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