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FROM BED BUGS TO BIG BUGS (actually both terms are incorrect)

FROM BED BUGS TO BIG BUGS (actually both terms are incorrect). Kyle’s Girlfriend’s Hands. http://www.emedicinehealth.com/slideshow_black_widow_brown_recluse_spiders/article_em.htm. Physical Properties.

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FROM BED BUGS TO BIG BUGS (actually both terms are incorrect)

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  1. FROM BED BUGS TO BIG BUGS (actually both terms are incorrect)

  2. Kyle’s Girlfriend’s Hands

  3. http://www.emedicinehealth.com/slideshow_black_widow_brown_recluse_spiders/article_em.htmhttp://www.emedicinehealth.com/slideshow_black_widow_brown_recluse_spiders/article_em.htm

  4. Physical Properties Knowledge of physical properties allow substances to be observed and tested without changing the nature of the substance (chemical composition) Example: melting ice and boiling water still leaves you with H2O Also salt and water are easily mixed and separated and the salt and water still retain their physical characteristics. Alloys (see handout) and solutions (salt water; air) Other physical mixtures from the lab…. Physical mixtures are characteristically non-uniform

  5. Chemical Properties These properties require the substance to “react” or be inherently altered so that it is different after the change. Consider the “Observation Lab” reactions All required the combination of different substances such that physical properties after the change were very different than those before the change. Chemical mixtures (compounds) are always uniform

  6. Mixture Separation Lab The mysterious mixture was separated by taking advantage of the physical properties of the components of the mixture. Iron - magnetic Iodine – sublimed and deposited on the cold surface Sand – did not dissolve in water (insoluble) and particles were large enough to be trapped by the filter paper Salts – were all soluble and passed through the filter paper and were collected by rapid evaporation.

  7. Based on your collected masses, calculate the percent composition of your mixture. Magnetic material: Sublimed material: Filtered material: Dissolved material: Hint: divide your individual masses by the original mass of your mixture and multiply by 100! You’re welcome!

  8. Mixture Separation Lab Analysis Compare your data to the data of classmates and the “true” values. What do you think about the data? Is it reliable (can we be confident that the data can be trusted?) Explain the differences by identifying possible errors (human error is not allowed – be more specific) as you carried out the lab. Identify the components of the mixture and the properties used to separate the mixture.

  9. 9) Holding the silver penny on the edges with tongs, place it in the hottest part of a burner flame. Pass it slowly through the flame. 10) When the color changes again, plunge the penny into a beaker of water. Metals are hot. 11) Make more coins. 12) Clean up without sin (be impeccable). Questions • Did you make gold? How could you prove it? • What element gives the penny its silver color? • What temperature does zinc melt? Look it up, lazy bums. • What is an alloy? • What is an alloy of copper and zinc? Copper and tin? • Why are alloys helpful/useful? • Draw a picture of what the particles of zinc did with the particles of copper.

  10. Matter Classification Assessment EvaluationHonors Chemistry You will complete assessments prepared by your classmates. Please evaluate it based on the following criteria (1-4 scale with 4 being most like and 1 being least like) Visually pleasing appearance (easy to read and understand) Challenging (it made you think) Length (it was great, not too short not too long) Accuracy (it effectively tested my level of knowledge of the content) Reliability (as an assessment tool, students with a similar understanding would get a similar score) Enjoyment Other complements and criticisms:

  11. Mixture Practice Spark • Complete the worksheet with your lab group, you will turn in whatever you have completed. • Use the flowchart if you need it. It distinguishes matter by particle size and how materials are combined.

  12. DOES IT LOOK LIKE ONE THING? Is there only one ingredient in the composition? Is it not on the periodic table? Is it made of more than one element?

  13. Matter Classification based on particle size!primary questions • Does it look like one thing? • Yes? • Homogeneous - from the same/one origin (homo – genesis) • Mixtures (solutions and alloys) and Pure Substances • No? • Heterogeneous - from different/multiple origins (hetero – genesis) • Mixture (suspensions and colloids)

  14. No Heterogeneous(mixture) Matter Primary Question:Does it look like one thing? Yes Homogeneous

  15. No Solution (mixture) Homogeneous QuestionIs it made of one ingredient? Yes Pure Substance

  16. No Colloids (From the Greek word for glue) Heterogeneous QuestionDoes it always look like more than one thing? Are the components easily observed? Yes suspensions

  17. Colloidal Dispersions Dispersed particles 1-100 nanometers in size

  18. Tyndall effect – helps distinguish between colloids and solutions (mixtures distinguished by the size of particles). Gold in water

  19. B • This liquid has particles that are big enough to disperse light. • Positive Tyndall Effect • Colloid

  20. No Compounds Pure Substance Question:Is it unable to be separated into simpler forms of matter? Yes Elements (Is it on the periodic table)

  21. No Solution Question:Is it made of metal? Yes Alloy (see handout)

  22. No nonmetal Element Question:Is it conductive, shiny, malleable, ductile?(periodic table) Yes metal Kind of? Metalloid/Semimetal

  23. No Nonelectrolyte (covalent or insoluble) Compound Question: After mixing with water, is it conductive? Yes Electrolyte (ionic and soluble)

  24. No Bases pH >7 or Neutral pH = 7 Electrolyte Question:Is the pH of the solution less than 7? Yes Acids pH < 7 pH = 7 Water and Salts

  25. No No Inorganic Nonelectrolyte Question:Is it a carbon based compound? Yes Organic There are entire years of college chemistry curricula devoted just to these two categories of chemical compounds

  26. Alchemy 101

  27. Chromatography

  28. SparkMeasurethe line on your measurement packet (in cm). Do not just copy the measure of your neighbor

  29. http://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10/http://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10/

  30. ALL Measurements in Science use the Metric System - The International System NOT the English System

  31. Systems of Measurement The U.S. English System The rest of the World Metric System - The International System

  32. SI Base Units Mass kilogram Length meter Time second Energy Joule Temperature Celsius o Amount of substance mole

  33. Derived Units Derived units involve multiple base units.

  34. Derived Units Area = length 2

  35. Derived Units Area = length 2 Volume = length 3

  36. Derived Units Area = length 2 Volume = length 3 Density = mass / volume

  37. SI Prefixes

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