1. Department of Chemistry, Institute for Science Education, University of Konstanz, 78464 Konstanz, Germany
2. Chair of Science Education, Thurgau University of Education, 8280 Kreuzlingen, Switzerland
3. Department of Biology and Chemistry, Institute for Science Education, University Bremen, 28359 Bremen, Germany
4. Department of Mathematics and Natural Sciences, Universitas Negeri Malang, 65145 Malang, Indonesia