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This study explores the mental images at the microscopic level of matter created by 22 preservice science teachers in Oman. Participants were encouraged during a guided imagery session to construct mental images for a scenario written about the explanation of the reaction of sodium in water. They were then asked to describe what they envisioned in their own imagination. Participants had images that were based on textbook illustrations, modeling kits, a solar-system model, physical properties, and humanized animations. 3D mental images represented 33.36% of participants' mental images at the microscopic level, while images in 2D format formed 39.15% of the overall created mental images. Several factors shaped the participants' mental images, such as their imaginative ability, attention mode, and the nature of their old images stored in their long-term memory. Most of the participants experienced image transformation from one form to another as they were progressing in the GI session. This unstable reliance on different models might indicate unorganized conceptual networks in learners' LTM: a feature that characterizes novices' mental networking. On the contrary, past research has revealed that experts have more organized and sophisticated conceptual networking. This study argued that participants lacked the homogeneous and reliable mental model of the atom that is required to carry out advanced cognitive processes for mental exploration of chemical phenomena. The absence of this mental model might explain the overwhelming finding in literature that many learners fail to explain and predict chemical phenomena.

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The purpose of the current study was to explore learners' evaluation of the credibility of scientific models that represent natural entities and phenomena. Participants were 845 students in grades 9-11 (aged 15-17 years) and 108 prospective science teachers in Oman, totaling 953 students. A survey called Epistemologies about the Credibility of Scientific Models was designed to explore participants' epistemological positions regarding the credibility of scientific models. This instrument was based on a credibility taxonomy proposed by the author. This taxonomy was composed of four epistemological levels: certainty, imaginary, suspicious, and denial; thus, it was called the CISD taxonomy. Findings revealed that natural entities and phenomena were assigned to CISD levels according to their level of abstractness. This level of abstractness is usually constructed by the most frequently used models to represent each natural entity or phenomenon. For instance, entities, which were usually represented by photographs or micrographs, such as meteors and meteorites, blood cells and bacteria, fell at the certainty level. On the other hand, theoretical entities such as electron cloud and photons had a high suspicious-denial combinational level. Some entities, with possible competing concreteabstract parallel nature of the scientific models that represent them, had both high certainty and suspicious-denial levels. The overall students' epistemological perceptions across grade levels showed a decrease in the certainty level and an increase in the imaginary level. It might also be plausible to conclude that new, detailed microscopic and more abstract knowledge raised the suspicious and denial levels of some entities. Further research based on qualitative research methodologies is needed to explore these findings.

The school system in Oman faces a problem in educating students in integrated science, technology, engineering and mathematics activities. This statement, in part, stems from science teachers' preparation programs. This study was aimed to close a research gap in Oman by investigating science pre-service (trainee/student) teachers' self-efficacy beliefs for teaching science by using engineering design processes. A self-efficacy beliefs for teaching as engineering design questionnaire was developed and utilized for measuring science trainee teachers' self-efficacy beliefs for teaching science by engineering design methods. A descriptive approach with quantitative data collection was used as a design of the study. A sample of 73 students at Sultan Qaboos University participated voluntarily. The results showed that student teachers believed themselves to be highly successful in teaching science. BSc program trainee teachers had higher perceptions of themselves as highly successful in teaching science with regard to personal self-efficacy beliefs and in two scales in outcome expectations for science teaching in the new manner than did trainee teachers with a teacher qualification diploma. Regarding gender and major, there was no statistically significant difference in trainee teachers' self-efficacy beliefs. Contributions to research and future perspectives of the study findings on improving science teaching and learning are discussed.

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