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Alfredo Tifi
ITT Divini, San Severino Marche (MC)
ICCE – ECRICE - ROME July19° 2012
So, it is one better than
two?Less lab time has stimulated reflections:
1. What the laboratory is for? Beyond fun
2. Talk & Reflect more on past experiments
vs claiming for "next episodes"
3. Relevance for the syllabus
4. Adapting the syllabus to lab concreteness
5. More emphasis on evidences from
everyday life plus class demonstrations
1/6 adaptable IBSE principles
Any important chemical concept should be referable to experimental evidence
Atoms emitting light
Atoms having nuclei
Ions having charges
http://rcl.physik.uni-kl.de/
2/6 adaptable IBSE principles
few meaningful experiments acting as milestones in the syllabus, e.g.:
combustion of magnesiumflame testdistillation of Coca Coladiffusion of potassium permanganatereaction Zinc plus Iodine...
3/6 adaptable IBSE principles
Language first: talk in advance about instruments, tasks, prepare the imaginery
preview certain phenomena
use background dictionary
elicit focus questions, investigations
ask to plan the experiment
compare different plannings
…
4/6 adaptable IBSE principles
Prepare everything in advance: your students have 30 minutes to do the experiment.
So they can't 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.
5/6 adaptable IBSE principles
Things to scaffold: • reporting, • discussing • testing
the experiment and related contents through in-school and out-of-school web2 environment permit extended interactions, as in Google Apps www.divini.net/chimica/
6/6 adaptable IBSE principles
Continue to scaffold and practice the use of concepts, repeating simulated experiments and descriptions and reviewing past experiments,
Accepting that the students won't master those concepts, won't be autonomous problem-solver.
An example of IBSE syllabus Diary
at: https://sites.google.com/a/divini.org/classe-1e-chimica/home/attivita
1. Sep. 21. Evaporating
DI-water & tap water
2. Oct.5-26. Measuring
mass & volume
3. Nov. 5-7 Mixing subs
Investigation
Volume units,
absolute/relative
error, sig. figs.
density, atoms
distributions in solids,
liquids and gases
Property, chem/phys
transfs. Substance
ACTIVITY CONCEPTS
4. Nov. 25, 28 Mg
combustion
5. Dec. 5 Zinc + Iodine
6. Dec. 19 Decompos.
of Zinc iodide
7. Dec. 19-Jan. 26
forming/separating
mix. Cu/CuSO4
Chemical combination,
elementary and
compound
substances
Atomic weight ratio,
composition ratio,
formula.
Decomposition,
element vs elemental
substance.
identity of a substance
homo/heterog.
mixture
8. Jan. 23-30 Solubility
of salts in water/NaCl
30%
9. Feb. 27 Diffusion
(KMnO4, HCl-NH3)
brownian motion,
soccer ball pressure,
T-shirt air drying.
Solubility, saturated
solution, causes of
different solubilities
Molecular motion
Temperature
Dynamic models of
solution formation
and evaporation.
Chemical reaction as
molecule collisions
more on pressure,
other insights on kinetic
model (qualitative)
investigating real atoms
plus challenging models
10. Mar 2 - 9. Weigh the
pressure of air with a
syringe, Boyle law
with syringe plus
body balance,
hampered straw
sucking
11. Mar 12-19.
Rutherford
experiment
rcl.physik.uni-kl.de/
12. Mar. 26. Light from
atoms (light from
gases H, He &
emission spectra)
13. Apr. 2, 4. Flame test
as problem solving:
which element atoms
are responsible for
the observed
colours?
Electromagnetic wawes
wawelenght & frequency
Planck equation:
frequency/energy
relation, photons.
Symbols & formulas
spectral lines and likeness
of electronic structures of
same elements.
Bohr model, levels &
electronic transitions
14. Apr. 16. Game:
"How the atom
works" http://www.mhhe.com/physsci/ast
ronomy/applets/Bohr/frame.html
15. Apr. 18, 20, 23; May
2, 4. Game: "Build an
Atom"http://phet.colorado.edu/en/simulation
/build-an-atom
Bohr model, levels &
electronic transitions
Planck equation:
wavelenght/frequency/
energy,photons, spectra.
Nucleons, Isotopes, Z, N, A,
noble gas element, octet,
charged atoms (ions) +
ionisation energy,
dimension, core/valence
shell model, periodic
trend, atomic weight
16. May 7. Investigate:
a) "recognize alkali
metal atoms“
b) "calculate masses of
LiCl, NaCl, KCl".
17. May 14,
Investigate:
"Differences in Li, Na
reacting in water"
PTE Group-family
equal number of different
atoms
Ions, ionic solid,
ion volume or radius
chemical reaction
equation.
Core effective charge,
valence electrons, atomic
radius, Ionisation
energy.
18. May 21. Investigate:
"Halogen tug of war"
19. May 25. Atom
mass/number
calculations
PTE Group-family
oxidation-reduction
electron-affinity
chemical reaction equation.
Octet
Core effective charge,
valence electrons, atomic
radius. Electron config.
Periodic trends.
Formula weight, relative
atomic weight ratios;
balancing ionic compound
formulas.
20. May 28 - June 7.
Demos: oxidations of
elemental
substances (Ca, Mg,
Fe, Cu, C, S) in
water, HCl, air.
End of Year
...
To be contd. in 2012-13
Periodic Table: metals,
nonmetals, semimetals.
electron configurations,
ions; ionic bond, covalent
bond, metal bond;
formulas of ionic
compounds, Lewis
notation; covalent
molecules and
formulas; octet rule;
redox reactions.
All that was less than any
textbook proposes.
Thank you very muchfor your attention
A l f r e d o T i f i
Website to access the diaries
www.divini.net/chimica
Email address
