Authenticity has recently become a popular term in science education. A study focusing on authenticity in the sense of making chemistry lessons better resemble chemistry practice is carried out at the University of Cologne in the Institute of Chemical Education, where prospective chemistry teachers are trained. In the long run an innovative module shall be developed, which challenges teacher students' pre-conceptions about characteristics of chemistry practice and supports them in translating their conceptions into authentic learning environments. This paper presents the first part of the project in which course elements to stimulate reflection on students' attitudes were evaluated. Moreover the students were given an opportunity for teacher students to create a practical activity for pupils in order to detect aspects in which the students need more support, for example possible ways for this transformation or more experience with inquiry-based learning.