“…To develop an in-depth understanding of the particulate nature of matter, students need to possess related scientiÞc knowledge such as the molecular constitution of a given substance (Abraham, Grzybowski, Renner, & Marek, 1992;Nakhleh, 1992;Nakhleh, Samarapungavan, & Saglam, 2005). Equally important, students need to master certain abilities and skills such as visualizing a chemical reaction at the molecular level, reasoning about a macroscopic phenomenon using chemical representations, and coordinating multiple representations (Ben-Zvi, Eylon, & Silberstein, 1987;Gabel & Samuel, 1987;Hesse & Anderson, 1992;Kozma, 2000Kozma, , 2003Krajcik, 1991;Yarroch, 1985).…”