Chem 106: Class/ Lab Week 4

1. Chem 106: Class/ LabWeek 4 Sign in: Roster @ front of lab Pick up graded papers

2. https://chem.libretexts.org/LibreTexts/Diablo_Valley_College/DVC_Chem_106:_Rusayhttps://chem.libretexts.org/LibreTexts/Diablo_Valley_College/DVC_Chem_106:_Rusay

4. DATAProcessing Data & Reporting Results What number best represents the respective VAT class result? How much does the class vary in each? Average Deviation or Standard Deviation of each, Maximum & Minimum of each. Average of each. Using a spreadsheet as a very useful tool.

5. Reporting ResultsStatistics & Rules Using a spreadsheet as a very useful tool. Chem 106 VAT Survey Results Should Max and Min be eliminated from the Data set and the Average recalculated to better describe the class?

6. MOOCs: “Free” CoursesLearning to Use a Spreadsheet (Excel) https://www.edx.org/course/analyzing-visualizing-data-excel-microsoft-dat206x-4

11. Popcorn Science: Analytical ChemistryHow good is your popcorn? Industry’s Quality Standards: Expansion Kernel Size Moisture Content cm3 / g Kernels / 10 g Percent H2O Describe how would you measure each of these experimentally with lab equipment in your lab drawer.

12. Which is better? Industry’s Quality Standards: Expansion Kernel Size Moisture Content cm3 / g Kernels / 10 g Percent H2O higher lower higher

13. Which is better? Industry’s Quality Standards: Expansion Kernel Size Moisture Content cm3 / g Kernels / 10 g Percent H2O higher lower higher

14. Which is better? Industry’s Quality Standards: Expansion Kernel Size Moisture Content cm3 / g Kernels / 10 g Percent H2O higher lower higher

15. Popcorn ScienceHow good does it taste?Follow Dr. R’s instructions Rank red, white, and blue bowls of popcorn. Taste each and rank them #1 or # 2 or # 3. Do not taste the popcorn if you have food allergies or don’t wish to. Write down your ranking.

16. Popcorn ScienceHow good does it taste?Follow Dr. R’s instructions Take out your i-clicker. Enter your rankings with your i-clicker as the questions appear. Ranking Questions: Which tasted the best; rank #1? Red=A White =B Blue = C D= Cannot Tell E=Allergic/DNT Which tasted the next best; rank #2?Red=A White =B Blue = C D= Cannot Tell E=Allergic/DNT Which ranked #3?Red=A White =B Blue = C D= Cannot Tell E=Allergic/DNT

18. Red = X White =Y Blue = Z

19. Chem 106 Lab: Density Turn in Course/ Lab Manual pp. 12-14 by the end of lab

20. Chem 106 Lab: Density Processing & Reporting Data from Measurements Complete pp.15-16 and turn by the end of lab

21. Add your unknown data to the set. Plot the entire data set. Turn in by the end of lab

22. Worksheet: Due TodayWork Collaboratively: Turn in Individually Write your name, then list the name(s) in parentheses of anyone who you worked with in doing the worksheet

23. Density http://www.density.com/what.htm Density = Mass / Volume [g/mL or g/cm3; g/L; kg/m3]

24. Density http://www.density.com/what.htm Density = Mass / Volume [g/mL or g/cm3; g/L; kg/m3] mass = extensive; volume = extensive

25. mass = extensive; volume = extensive

26. Elements = Scientifically observable atoms Atoms combine to form molecules (compounds) Do you know the names of the final four: 113, 115, 117 and 118? Nihonium, Moscovium, Tennessine, Oganesson

28. CHEMISTRY of Observable Stuff: Atoms & Molecules https://www.youtube.com/watch?v=xANGsTqxdUw&feature=em-subs_digest&spfreload=1 • Have you had a caffeine fix today? • The universe, atoms & molecules, in a cup of coffee…. or tea.

29. CHEMISTRY of the Atom FUNDAMENTAL PARTICLES: MassChargeSymbol Nucleus: • PROTON 1 amu +1 H+, H, p • 1.67 x 10 -27 kg • NEUTRON 1 amu 0 n • 1.67 x 10 -27 kg _________________________________________ • ELECTRON very small -1 e - •  2000 x smaller than a proton or neutron This particle is said to “hold” or “bond” atoms together in molecules.

30. CHEMISTRY of the Atom • Atoms (neutral electrostatic charge: # protons= # electrons) • # Protons = Atomic Number • Atomic Mass = # Protons + # of Neutrons • Isotope: same atomic number but different atomic mass (different # of neutrons)

31. CHEMISTRY of the Atom https://phet.colorado.edu/sims/html/build-an-atom/latest/build-an-atom_en.html

32. Atomic Symbols 39 K Mass number   Element Symbol 19 Atomic number  39 K Also written as 

33. CHEMISTRY of the Atom • Atomic Number = 6 (atom’s identity) • Carbon • Atomic Mass = 13 (isotope 13) • 6 protons; # neutrons = 13 - 6 • neutral atom has 6 electrons

34. Nuclear ParticlesEmitted from unstable nucleii (Isotopes) • Emitted Particles: Mass Charge Symbol • alpha particle 4 amu +2 • beta particle very small -1 • gamma very very small 0 HIGH Energy: “particles”

35. Nuclear Penetrating Power • alpha particle: low • beta particle: moderate • gamma: high • X-rays? Water

36. Nuclear Penetrating Power • alpha particle: low • beta particle: moderate • gamma: high • X-rays? Water

37. Exposure to Radiation 100 mrem = 1 mSv

38. Nuclear Reactions / Fission President Truman / Hiroshima http://hiroshima.mapping.jp/ge_en.html August 6, 1945 http://hiroshima.mapping.jp/ge_en.html

39. Worldwide Nuclear Power Plants Fission: Uranium Fuel

41. Nuclear Plant Disaster March 2011 Fukushima, Japan

42. Nuclear Reactions / Fusion National Ignition FacilityLawrence Livermore National Laboratory

43. ITER: International Thermonuclear Experimental Fusion Reactor Research and engineering project which is currently building the world's largest and most advanced experimental tokamak nuclear fusion reactor in the south of France. http://www.iter.org/