Is one better than two


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International Conference of Chemical Education - ROME - July 2012

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Is one better than two

  1. 1. Alfredo Tifi ITT Divini, San Severino Marche (MC) a.tifi@divini.orgICCE – ECRICE - ROME July19° 2012
  2. 2. So, it is one better thantwo?Less lab time has stimulated reflections:1. What the laboratory is for? Beyond fun2. Talk & Reflect more on past experiments vs claiming for "next episodes"3. Relevance for the syllabus4. Adapting the syllabus to lab concreteness5. More emphasis on evidences from everyday life plus class demonstrations
  3. 3. 1/6 adaptable IBSE principlesAny important chemical concept should be referable to experimental evidenceAtoms emitting lightAtoms having nuclei having charges
  4. 4. 2/6 adaptable IBSE principlesfew meaningful experiments acting as milestones in the syllabus, e.g.:combustion of magnesiumflame testdistillation of Coca Coladiffusion of potassium permanganatereaction Zinc plus Iodine...
  5. 5. 3/6 adaptable IBSE principlesLanguage first: talk in advance about instruments, tasks, prepare the imaginerypreview certain phenomenause background dictionaryelicit focus questions, investigationsask to plan the experimentcompare different plannings…
  6. 6. 4/6 adaptable IBSE principlesPrepare everything in advance: your students have 30 minutes to do the experiment.So they cant waste time to make the queue at the balance to weigh, to search for materials, to prepare solutions or to accomplish lengthy filtering or evaporation tasks.
  7. 7. 5/6 adaptable IBSE principlesThings to scaffold:• reporting,• discussing• testingthe experiment and related contents through in-school and out-of-school web2 environment permit extended interactions, as in Google Apps
  8. 8. 6/6 adaptable IBSE principlesContinue to scaffold and practice the use of concepts, repeating simulated experiments and descriptions and reviewing past experiments,Accepting that the students wont master those concepts, wont be autonomous problem-solver.
  9. 9. An example of IBSE syllabus Diaryat: ACTIVITY CONCEPTS1. Sep. 21. Evaporating Investigation DI-water & tap water Volume units,2. Oct.5-26. Measuring absolute/relative mass & volume error, sig. figs. density, atoms distributions in solids, liquids and gases3. Nov. 5-7 Mixing subs Property, chem/phys transfs. Substance
  10. 10. 4. Nov. 25, 28 Mg Chemical combination, combustion elementary and compound substances5. Dec. 5 Zinc + Iodine Atomic weight ratio, composition ratio, formula.6. Dec. 19 Decompos. Decomposition, of Zinc iodide element vs elemental substance.7. Dec. 19-Jan. 26 forming/separating identity of a substance mix. Cu/CuSO4 homo/heterog.
  11. 11. 8. Jan. 23-30 Solubility Solubility, saturated of salts in water/NaCl solution, causes of 30% different solubilities9. Feb. 27 Diffusion Molecular motion (KMnO4, HCl-NH3) Temperature brownian motion, Dynamic models of soccer ball pressure, solution formation T-shirt air drying. and evaporation. Chemical reaction as molecule collisions
  12. 12. 10. Mar 2 - 9. Weigh the more on pressure, pressure of air with a other insights on kinetic syringe, Boyle law model (qualitative) with syringe plus body balance, hampered straw sucking investigating real atoms11. Mar 12-19. plus challenging models Rutherford experiment
  13. 13. 12. Mar. 26. Light from Electromagnetic wawes atoms (light from wawelenght & frequency gases H, He & Planck equation: emission spectra) frequency/energy relation, photons.13. Apr. 2, 4. Flame test Symbols & formulas as problem solving: spectral lines and likeness which element atoms of electronic structures of are responsible for same elements. the observed colours? Bohr model, levels & electronic transitions
  14. 14. 14. Apr. 16. Game: Bohr model, levels & "How the atom electronic transitions works" Planck equation: ronomy/applets/Bohr/frame.html wavelenght/frequency/ energy,photons, spectra. Nucleons, Isotopes, Z, N, A, noble gas element, octet, charged atoms (ions) +15. Apr. 18, 20, 23; May ionisation energy, 2, 4. Game: "Build an dimension, core/valence Atom" shell model, periodic /build-an-atom trend, atomic weight
  15. 15. 16. May 7. Investigate: PTE Group-familya) "recognize alkali equal number of different metal atoms“ atomsb) "calculate masses of Ions, ionic solid, LiCl, NaCl, KCl". ion volume or radius chemical reaction 17. May 14, equation. Investigate: "Differences in Li, Na Core effective charge, reacting in water" valence electrons, atomic radius, Ionisation energy.
  16. 16. 18. May 21. Investigate: PTE Group-family"Halogen tug of war" oxidation-reduction electron-affinity chemical reaction equation. Octet Core effective charge, valence electrons, atomic radius. Electron config. Periodic trends. Formula weight, relative19. May 25. Atom atomic weight ratios; mass/number calculations balancing ionic compound formulas.
  17. 17. 20. May 28 - June 7. Periodic Table: metals, Demos: oxidations of nonmetals, semimetals. elemental electron configurations, substances (Ca, Mg, ions; ionic bond, covalent Fe, Cu, C, S) in bond, metal bond; water, HCl, air. formulas of ionic compounds, LewisEnd of Year notation; covalent... molecules and formulas; octet rule; redox reactions.To be contd. in 2012-13 All that was less than any textbook proposes.
  18. 18. Thank you very muchfor your attention Alfredo Tifi Website to access the diaries Email address