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With this in mind we combined four different theoretical approaches: The first theory addresses the experience and the assessment of chemistry teaching: Most of us would not choose a career which deals mostly with a subject we did not enjoy at school. He states that people have to cope with different tasks in teen dimond model free video clip phases of their lives. Schenk (2005) defined six developmental tasks which should be dealt with in chemistry lessons (value, concepts, vocation, tsen, gender, body). Work conducted for example by Chambers (1983) or Narayan (2009) show that students have negative stereotypes of scientists.