Focuses on the idea of chemical change and reports data from a study exploring the development of the concept of substance in children aged 11-14. Examines the use of the idea of elements, compounds, and bonding between atoms to explain chemical change and the intersection of these ideas with "basic" particle ideas. (Contains 21 references.)…

Considers substance identity and pupils' interaction with the scientific idea of melting and boiling behavior as a means for identification and assessment of purity. Presents evidence that suggests that children do not naturally have a concept of substance identity that allows them to recognize chemical change as a possibility. (Contains 31…

Reports the findings of a three-year study that explored the development of children's concepts of evaporation at room temperature and condensation of atmospheric water vapor. (DDR)

Explores the development of children's conception of a substance and reports the findings in relation to children's understanding of boiling water and particle ideas. Argues that boiling water should have a broad significance in the curriculum. Contains 23 references. (DDR)

Reports the findings of a study that suggest that alternative ideas can form part of a progression toward a scientifically acceptable model. Argues that teaching may be inadvertently promoting alternative ideas as endpoints. Contains 38 references. (DDR)