Multiple representations in web-based learning of chemistry concepts

A new chemistry curriculum for secondary schools is currently under construction in the Netherlands, in which chemical knowledge will be embedded in contexts that show applications of chemistry in the society. Several research groups develop such modules and a committee appointed by the Dutch Ministry of Education advises about the chemical content and concepts.\ud A central issue in chemistry education is the relation between the real, molecular and symbolic world. Skilled chemists switch easily between these worlds, but beginning students do not. They could get better results and will be more able to solve problems if they would make better connections between the three chemical worlds. The University of Twente has developed a series of lessons about the particle model. Included in this instruction material are animations of chemical processes at the molecular level. In the lessons students are supported and stimulated to make connections between the three chemical worlds. Students are shown the importance of new chemical knowledge in society. The mental images and the knowledge schemata of the students are investigated in this research. The students were interviewed before they received instruction, and after they received about half of the instruction. At the end of the instruction they were asked to make a concept map.\ud It appeared that the links between the real, molecular and symbolic world are not strengthened after the instruction. The students make more links between the real and symbolic world, but hardly connect these world to the molecular world or vice versa. There is still a gap between the students’ mental models and scientifically accepted models as represented in animations and illustrations in the instruction. Most students liked the animations in the instruction and mentioned them as strong point. It is therefore surprising that some students could not remember the animations when they were interviewed, whilst others their representations were about the same as the animations. Clearly, the effectiveness of the animations must be enhanced and more research is needed for this

Assessing teachers’ beliefs to facilitate the transition to a new chemistry curriculum: what do the teachers want?

In this article, we describe the results of a study of chemistry high school teachers’ beliefs (N = 7) of the chemistry curriculum and their roles, their beliefs on the teacher as developer of materials, and their beliefs about professional development. Teachers’ beliefs influence the implementation of a curriculum. We view the use of a new curriculum as a learning process, which should start at teachers’ prior knowledge and beliefs. The results reveal that it is possible to develop a new curriculum in which teachers’ beliefs are taken as a starting point. Promising approaches to prepare teachers for a new curriculum is to let them (co)develop and use curriculum materials: It creates ownership, and strengthens and develops teachers’ pedagogical content knowledge (PCK)

The effects of the design and development of a chemistry curriculum reform on teachers’ professional growth: a case study

A curriculum innovation requires new learning material for students and a preparation program for teachers, in which teacher learning is a key ingredient. In this paper we describe how three experienced teachers, involved in the development and subsequent classroom enactment of student learning material for context-based chemistry education, professionalized. For data collection a questionnaire, three interviews and discussion transcripts were used. Our results show that: (a) teachers, cooperating in a network under supervision of an expert, can develop innovative learning material; (b) the development of learning material can be seen as a powerful program to prepare teachers for an innovation; and (c) teachers’ knowledge increased in all five pedagogical content knowledge domains during the development and class enactment phases

A Model for In-service Teacher Learning in the Context of an Innovation

When curricula change, teachers have to bring their knowledge and beliefs up to date. Two aspects can be distinguished: what do teachers learn and how is it learned. Two groups of teachers were involved during the preparation of a new chemistry curriculum. One group developed student learning material and subsequently enacted this in class. Another group only class-enacted this. Based on teacher learning, a model to understand teacher growth is presented. As the combination of a development phase with a class enactment phase proved instrumental, an existing model, the interconnected model of teacher professional growth, was extended. The consequence is that for teacher learning for a renewal a (re)development phase followed by a class enactment phase is essentia

The effects of prior education and engagement on success in engineering studies: do women and men differ?

Background In Dutch engineering education, female students outperform male students. Using an interactionalist framework, this study explores factors that contribute to this gender-based difference. Purpose This study aims to answer two questions: Do female and male students differ in background characteristics, engagement factors, and academic success? Are differences in the relationships among background characteristics, engagement factors, and academic success gender-specific? Design/method Data on male and female engineering undergraduate students from five Dutch universities were subjected to linear structural modeling to compare potential gender differences in the relationships among the focal variables. Two structural models were considered. Results Female students spent more time on independent study, reported more social inte- gration, completed more credits, and were more likely to stay in engineering than were male students. Academic integration and intention to persist were important for comple- tion of credits for both genders. Social integration was only important for men’s academic success. Females seemed to benefit less from good preparation through active learning during secondary education, and the effect of a high grade point average on math was neg- ative for females but positive for males. Conclusions Interactionalist concepts can explain academic success, but the relationships among concepts vary by gender. Males’ intentions to persist in engineering are an outcome of engagement processes during the first year, whereas females’ intentions to persist in engineering are manifest at the start of the first year

Een algemene benadering werkt niet:disciplinaire verschillen als verklaring van studievoortgang in het hoger beroepsonderwijs

In dit artikel combineren we concepten uit Tinto’s interactionele theorie over de oorzaken van studie-uitval en Becher’s theorie over wetenschapsgebieden ter verklaring van studievoortgang van eerstejaarsstudenten in het hoger beroepsonderwijs. De data zijn verzameld via een online-vragenlijst, afgenomen bij ruim 8.000 eerstejaarsstudenten van vijf ho- gescholen (respons 30%). Eerst is voor een selectie van de totale responsgroep (N = 1.876) een lineair structureel model getoetst waarin voorbereiding, ervaringen en studiegedrag in het eerste jaar studievoortgang verklaren. Vervolgens zijn modellen voor de sectoren Economie (N = 920), Techniek (N = 313), Gezondheidszorg (N = 284), en Gedrag & Maatschappij (N = 359) ontwikkeld en vergeleken. De ‘intentie om te blijven’, gemeten na drie maanden in het eerste jaar, blijkt in alle sectoren de belangrijkste voorspeller van studievoortgang. Goede voorbereiding op actief leren en academische kennis en vaardigheden in de vooropleiding beïnvloeden tevredenheid over aansluiting en studievoortgang. De factoren geslacht, vooropleiding, voorbereiding op actief leren in de vooropleiding, contacturen en zelfstudie laten per sector belangrijke verschillen zien in effecten op eerstejaarservaringen en studievoortgang. De resultaten impliceren dat een generieke benadering voor het verklaren van studievoortgang, rendementsanalyses, kwaliteitszorg en verbetering van de aansluiting onvoldoende is. Meer aandacht is gewenst voor verschillen tussen sectoren