Teo Tang Wee

There is increasing interest in the research of alternative conceptions in electrochemistry as it is ranked as one of the most difficult topics in chemistry (Garnett & Treagust, 1992a, b). This study is the first to be carried out within the Singapore context which specifically diagnoses students' understanding in electrochemistry. It aims to identify Singapore junior college students' alternative conceptions of redox processes in electrochemistry. Its primary purpose is to bring the curriculum planners', teachers' and students attention to the existence of alternative conceptions on electrochemistry, so as to improve the teaching and learning of this topic.

This study replicated and extended the research done by Garnett et. al. (1995), Sanger and Greenbowe (1997a, b), Ogude and Bradley (1994) and other researchers. A list of conceptual and propositional knowledge statements adapted from previous studies by Garnett and Treagust (1992a, b) helped to identify the knowledge base necessary for students to understand electrochemistry. Alternative conceptions that had been reported in several other studies were also consolidated to give a more comprehensive list of alternative conceptions related to electrochemistry.

The list of conceptual and propositional knowledge statements and alternative conceptions provided the framework for the development of an open-ended questionnaire which was administered to about sixty second year junior college students (17 to 18 years old). This was followed by semi-structured interviews with four selected students to further probe their understanding of electrochemistry.

The alternative conceptions identified in the study were very similar to those identified in previous related studies. The areas of alternative conceptions surfaced from this study include the charge law, electric current, standard half-cell, current in an electrochemical cell and charges on the electrodes of electrochemical cells.

Interestingly, one new alternative conception was surfaced from this study :

The electrodes of the electrochemical cell must be placed in two solutions of different concentrations.

The study also revealed that the textbooks used in junior colleges may be inadequate teaching and learning materials. The two highly recommended A-level textbooks by Briggs and Ramsden were scrutinised and found to have excluded content knowledge that would aid in the understanding of electrochemistry. In addition, they were found to contain information that could mislead students and cause them to develop alternative conceptions. Some of these information include stating that the charges assigned to half-cells were identified from their positions in the diagram and assigning oxidation numbers by changing covalent bonds into 'electrovalent bonds'.

Competency in making inferences is an important aspect of student learning in the 21st Century, for making better-informed decisions. The purpose of our study is to investigate the type of science capital that can predict the science inference competencies of lower track students. Science capital comprises diverse social capital, cultural capital, and mental schema. A total of 1,397 Normal Academic (NA) and 637 Normal Technical (NT) Grade 7 students from 37 public secondary schools in Singapore participated in the study. Three separate science inference tests were administered to the students over one academic year, and test scores were calibrated and equated using Rasch analysis. The relationship between students’ perceptions of science capital and their development in science inference competencies was investigated using Ordinary Least Squares regression analysis. The results indicated that NA students’ self-views in science learning and their views about the nature of science were significant predictors of their scientific inference competencies. For NT students, their views about science teachers was the only significant predictors of their performance on making scientific inferences. Based on the research design and findings, we draw implications for local and international science curriculum policy. Additionally, we demonstrate the usefulness of Rasch analysis.

The underrepresentation of women in STEM (science, technology, engineering, and mathematics) fields is a problem that plagues many places in the world. According to the U.S., Department of Commerce, Economics and Statistics Administration (2009), women held less than 25-percent of the STEM jobs, and are disproportionately fewer women having earned STEM undergraduate degrees, especially in engineering. In the U.K. (Kirkup, Zalevski, Maruyama, & Batool, 2010), women represented less than 12.3-percent of the workforce in all science, engineering, and technology occupations. Only one in five countries in the world have achieved gender equality in research careers (UNESCO, 2012). While Singapore is well-known for its excellent student performance in international mathematics and science tests such as Trends in International Mathematics and Science Study (TIMSS) and Programme for International Student Assessment (PISA), women make up less than 30-percent of the total researchers in 2012 (UNESCO, 2014). This worldwide phenomenon is often metaphorically described as the leaky STEM pipeline (Blickenstaff, 2005) which posed problems for developing and developed nations looking to harness more diverse ideas, increasing the number of productive workforce, and improving the quality of women's lives. Currently, there are no published studies in the Singapore context that specifically examine how feminist approaches to STEM teaching impact girls' attitudes (e.g., interest, self-concept, STEM career and post-secondary education decisions, and participation) towards STEM, and the construction of STEM-related identities. This is a proposal for a research study about the Singapore Committee for United Nations Women, Girls To Pioneer programme, which is aimed at promoting more women and girls in STEM fields. The programme adopts feminist pedagogies in actively engaging girls to participate in diverse STEM activities so that positive attitudes towards STEM may be developed. Using pre- and post-programme surveys, lesson videos, and interviews, we examine the impact of the Girls To Pioneers programme on diverse participants' attitudes and STEM identities. The participants are girls aged between 10-15 and recruited from schools or private centres (e.g., after school study centres) that have signed up for the Girls to Pioneers programme. The findings will have implications for Singapore STEM educators as they develop greater awareness about gender inequity issues in STEM, and learn about informal STEM efforts that can help to shape girls' attitudes and constructed STEM identities so that they can also emulate and promote such efforts in their everyday teaching.

United States’ education reform document like the new A Framework for K-12 Science Education discussed a more scientific way of learning – the emphasis of scientific inquiry through Science Practices, which include both specific scientific skills and cognitive processes. Likewise, in Singapore, the importance of Science Practices is reflected as desirable learning outcomes in the secondary (Grade 7 – 11) science syllabuses. With the significance of Science Practices in education, this study serves to identify the challenging types of Science Practices for students, specifically those from the lower secondary (Grade 7 – 8) Normal streams in Singapore. In this research, these students were collectively known as the Low Progress group due to their weaker academic abilities. Three science inference tests with 35 individual items assessing various Science Practices were administered and responses were analysed with Rasch analysis. Thereafter, Science Practices were categorised into higher-order, middle-order and lower-order to reflect the students’ difficulty in applying them. Results showed that students struggled the most with Science Practices that required them to decipher information that were beyond their language abilities. These findings will be useful towards teaching, assessing, curriculum planning and research studies involving the academically weaker students.