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Experimentelle Anwendung der Extraktion des grünen Blattfarbstoffs aus einer Textilie

Experimentelle Anwendung der Extraktion des grünen Blattfarbstoffs aus einer Textilie

          
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About the Book

Unterrichtsentwurf aus dem Jahr 2002 im Fachbereich Chemie - Didaktik, Note: gut, Sprache: Deutsch, Abstract: Bezüglich der Unterrichtsgestaltung in der Hauptschule sind gemäß Lehrplan NRW/HS insbesondere wichtig: Die erzieherische Intention des Unterrichts ist zunächst darauf gerichtet, die erkundende Eigentätigkeit der SuS zu fördern. Außerdem wird die Ausbildung sogenannter "sekundärer Tugenden" angestrebt, wie (zunehmend) genaues Experimentieren, unvoreingenommenes Beobachten, Behutsamkeit bei Schlussfolgerungen und Bereitschaft zur kritischen Diskussion der eigenen Position. In der Unterrichtsreihe werden die Trennverfahren Filtration, Extraktion und Chromatographie am grünen Blattfarbstoff vertiefend bearbeitet. Die heutige Unterrichtsstunde liegt im mittleren Teil der Unterrichtsreihe, d.h. die SuS verfügen demnach über Vorkenntnisse, die sie an Hand einer weiteren Anwendung der Extraktion vertiefen. In der heutigen Stunde geht es schwerpunktmäßig um eine Vertiefung des Herauslösens (extrahieren) vom grünen Blattfarbstoff aus dem vom Lehrer vorbereiteten vorgefärbten Hemd. Aus einer alltäglichen Situation heraus, z.B. Fußball spielen, klettern auf Bäumen usw., soll dieses Trennverfahren als ein Beispiel der Reinigung für eine Anwendung der chemischen Industrie vorgestellt werden, so dass die SuS das Gelernte aufs tägliche Leben übertragen und zuordnen können. Die Wahl von Plakaten zur Präsentation von Ergebnissen hat zwei wesentliche Vorteile. So kann bei Zeitmangel ohne größere Wiederholung in der nächsten Stunde angeknüpft werden und schließlich ist die Sicherung auf dem Plakat für alle SuS weiterhin präsent und damit jederzeit abrufbar. Im weiteren Verlauf der Unterrichtsreihe sollen die SuS ihre Beobachtungen und Ergebnisse in einer Gruppenarbeit präsentieren und auf Plakaten in der Schule veröffentlichen. Probleme könnten sich bei der Verbalisierung der fachlichen Beschreibung der Trennverfahren ergeben. In diesem Fall wird der Lehrer hierbei den S


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Product Details
  • ISBN-13: 9783656661863
  • Publisher: Grin Verlag Gmbh
  • Binding: Paperback
  • Language: German
  • Returnable: N
  • Spine Width: 1 mm
  • Width: 178 mm
  • ISBN-10: 3656661863
  • Publisher Date: 10 Jun 2014
  • Height: 254 mm
  • No of Pages: 12
  • Series Title: German
  • Weight: 41 gr


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Experimentelle Anwendung der Extraktion des grünen Blattfarbstoffs aus einer Textilie
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Experimentelle Anwendung der Extraktion des grünen Blattfarbstoffs aus einer Textilie
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