This study analyzed cognitive representations of knowledge from the chemistry of matter unit in a ninth-grade science textbook--the only authorized textbook in Saudi Arabia. It examined textual and visual information from two lessons in order to identify the textbook's introduction of concepts, linguistic context, integration of concepts, and the…

This study presents an analysis of alternative conceptions (ACs) on acid--base chemistry harbored by grade 9 students in Singapore. The ACs were obtained by the development and validation of a 4-tier diagnostic instrument. It is among the very few studies in the science education literature that have focused on examining results based also on…

This paper synthesizes research on the value of writing in learning science at all grade levels. Breakthroughs and barriers to the effective use of writing to learn science are discussed. Differences between elementary and secondary teachers are considered with regard to background in language arts, understanding of the writing process, and the…