Chemistry Reference
In-Depth Information
chemistry lessons to assist the students in understanding and critically reflecting on
scientific issues, which are presented in the media [
22
]: a demanding goal for
teaching chemical terminology.
Problems and Exercises
P7.1 Different types of symbols or formulae exist in chemistry. State different
types (a) for three crystalline solids, (b) for three volatile substances. Which
information hides behind the different symbols or formulae?
P7.2 For the introduction of chemical symbols it is reasonable to teach the students
in everyday language first, then switch to scientific terminology and later to
chemical symbols. Describe this way using three different examples.
P7.3 Chemical symbols can look very different on different levels of the spiral
curriculum: there may be words, empirical formulae or structural formulae.
Choose three different reactions and formulate the reaction equations on these
three levels.
P7.4 Theoretically combine “ions left and right in PSE” (see Fig.
7.7
). Write down
the formulae of three different salt crystals and draw corresponding models of
ionic structures. Determine chemical symbols on the basis of ionic charge
numbers: use the worksheet in Fig.
7.12
.
P7.5 Theoretically combine “metal atoms left and left in PSE” (see Fig.
7.7
). Give
three examples of alloys and draw your mental models. Determine chemical
symbols for the metal structures from unit cells, using the examples of the
worksheet in Fig.
7.13
.
References
1. Zahn Pv (1981) Freund und Helfer oder heimlicher Feind ? Chemie im Kreuzfeuer der
offentlichen Meinung. CU 12:1
2. Dorrenbacher A (1995) IUPAC-Regeln und DIN-Normen im Chemieunterricht. Aulis: Koln
3. Langer S (1979) Philosophie auf neuen Wegen. Mittenwald
4. Barke H-D (1988) Chemiedidaktik zwischen Philosophie und Geschichte der Chemie.
Frankfurt
5. Jackel M et al (1998) Chemie heute Sekundarstufe II. Schroedel, Hannover
6. Sumfleth E et al (1989) Stoffe: Eigenschaften und Reaktionen. Modelle: Teilchenanordnungen
und -umordnungen. Eine mit Lernhilfen gestutzte Einfuhrung in die Chemie. MNU 42:411
7. Behrendt H (1997) Concept mapping. Schulerinnen und Schuler konstruieren eigene
Begriffsnetze. NiU-Physik 8:18
8. Schmidkunz H, B
uttner D (1985) Chemieunterricht im Spiralcurriculum. NiU-P/C 33:19
9. Steinbuch K (1977) Denken in Modellen. In: Sch
€
€
afer, G., u.a.: Denken in Modellen.
Westermann, Braunschweig
10. Scheible A (1969) Ist unser Chemieunterricht noch zeitgem
€
aß ? MNU 22:449
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€
ur Quereinsteiger. Sch
€
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unster
