We have investigated how chemistry textbooks use models of redox reactions in different subject areas, how they change models between and within the topics, and how they deal with specific learning difficulties identified in the literature. The textbooks examined were published for use in the natural science programme in Swedish upper secondary schools and in the UK A-level course. As a starting point, the defined redox models found in the literature were used to investigate the textbooks. The results show that all redox models are used with the addition of alternative representations. Authors exclusively use the electron and the oxidation number models in inorganic chemistry. In organic chemistry, the oxygen and hydrogen model are used, and in biochemistry mainly hydrogen and alternative representations. There is no guide to changes of models between the subject areas. However, within the inorganic chemistry, authors guide model change which was not identified in either organic or biochemistry. Regarding the learning difficulties, the authors dealt with just a few of them.
Explanations for a decline in the number of students studying chemistry at advanced level all over the world have been sought for quite some time. Many students do not find chemistry relevant and meaningful and there have been difficulties in developing school chemistry courses that engage students sufficiently and tempt them to further studies in the field. In this study, Swedish upper secondary school students (N s =372) and their teachers (N t =18) answered a questionnaire on their experiences of the content and the working methods of their chemistry course. They were also given the opportunity to express ideas on how to make chemistry courses more interesting and meaningful. The results point out some subject areas as both easy and interesting, e.g. atomic structure; while other areas are hard to understand but still interesting, e.g. biochemistry. The students find chemistry lessons teachercentred, something they appreciate. When teachers and students gave suggestions on how to improve the relevance of chemistry education at upper secondary level, more laboratory work and connections to everyday life were the most common proposals. But on the whole, these students seem quite satisfied with their chemistry courses. BackgroundIn many countries, as in Sweden, there has been a decline in the number of students studying chemistry at the university level. Many studies have tried to explain why students, when leaving upper secondary school, are not interested in taking chemistry at the tertiary level. The low interest has, of course, not only one cause but is attributed to a number of different reasons. Twenty-five
This article reports on a study of how teenagers made their decision on whether or not to vaccinate themselves against the new influenza. Its purpose was to identify connections between how teenagers talk about themselves and the decision they made. How do the teenagers construct their identities while talking about a specific socio-scientific issue? Seven teenagers between 17 and 19 years of age participated in the study. The informants were requested to document in video diary situations in which their decisions about the vaccination were discussed. All the teenagers recorded their diaries during the weeks of the vaccination programme. The students were also interviewed 1-4 weeks after completing their diaries. A discourse psychology framework (Potter and Wetherell 1987) was used to analyse the video diaries and the interviews. In this context, decision-making on a socioscientific issue must be understood as an appropriation and use of discursive repertoires, and also as meaning-making in relation to other fields, such as society and identity. It must also be understood in relation to the use of science repertoire-or actually, the school science repertoire-how available is this discourse in different contexts outside school? The repertoires were categorised into two main types; experienced emphases and important actors. The first included the categories of risk, solidarity and knowledge. The second included family and friends, media, school and society. The school repertoire was seldom used by the students, indicating that school and science education seem not to be an interpretative repertoire available to them. Instead, the risk, solidarity, family and friends and the media repertoires were available in their talk about vaccination. These results indicate the need to use media reports in dealing with scientific literacy and also in risk assessment discussions in school. It also indicates the importance of relating school science closely to the students' daily life.
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