Conceptual resources for learning science: issues of transience and grain-size in cognition and cognitive structure

Many studies into learners' ideas in science have reported that aspects of learners' thinking can be represented in terms of entities described in such terms as alternative conceptions or conceptual frameworks, which are considered to describe relatively stable aspects of conceptual knowledge that are represented in the learner's memory and accessed in certain contexts. Other researchers have suggested that learners' ideas elicited in research are often better understood as labile constructions formed in response to probes and generated from more elementary conceptual resources (e.g. phenomenological primitives or 'p-prims'). This 'knowledge-in-pieces perspective' (largely developed from studies of student thinking about physics topics), and the 'alternative conceptions perspective', suggest different pedagogic approaches. The present paper discusses issues raised by this area of work. Firstly, a model of cognition is considered within which the 'knowledge-in-pieces' and 'alternative conceptions' perspectives co-exist. Secondly, this model is explored in terms of whether such a synthesis could offer fruitful insights by considering some candidate p-prims from chemistry education. Finally, areas for developing testable predictions are outlined, to show how such a model can be a 'refutable variant' of a progressive research programme in learning science

College students' conceptions of chemical stability: The widespread adoption of a heuristic rule out of context and beyond its range of application

This paper reports evidence that learners commonly develop a notion of chemical stability that, whilst drawing upon ideas taught in the curriculum, is nevertheless inconsistent with basic scientific principles. A series of related small-scale studies show that many college-level students consider that a chemical species with an octet structure, or a full outer shell, will necessarily be more stable than a related species without such an electronic configuration. Whilst this finding is in itself consistent with previous research, the present paper shows how students commonly apply this criterion without consideration of chemical context, or other significant factors such as net charge. Species that would seem highly unstable and non-viable from chemical considerations, such as Na7-, C4+ and even Cl11-, are commonly judged as being stable. This research shows that many college level students are privileging a simple heuristic (species with full outer shells will be stable) when asked about the stability of chemical species at the submicroscopic level, to the exclusion of more pertinent considerations. Some students will even judge an atom in an excited state as more stable than when in the ground state, when an electron is promoted from an inner shell to 'fill' the outer shell. It is suggested that the apparently widespread adoption of a perspective that is so odds with the science in the curriculum is highly significant for the teaching of chemistry, and indicates the need for more detailed studies of how such thinking develops and can be challenged

Exploring conceptual integration in student thinking: evidence from a case study

Two reasons are suggested for studying the degree of conceptual integration in student thinking. The linking of new material to existing knowledge is an important aspect of meaningful learning. It is also argued that conceptual coherence is a characteristic of scientific knowledge and a criterion used in evaluating new theories. Appreciating this 'scientific value' should be one objective when students learn about the nature of science. These considerations imply that students should not only learn individual scientific models and principles, but should be taught to see how they are linked together. The present paper describes the use of an interview protocol designed to explore conceptual integration across two college level subjects (chemistry and physics). The novelty here is that a single interview is used to elicit explanations of a wide range of phenomena. The potential of this approach is demonstrated through an account of one student's scientific thinking, showing both how she applied fundamental ideas widely, and also where conceptual integration was lacking. The value and limitations of using this type of interview as one means for researching conceptual integration in students' thinking are discussed

Coordinating procedural and conceptual knowledge to make sense of word equations: understanding the complexity of a ‘simple’ chemical task at the learner’s resolution

This paper discusses the conceptual demands of an apparently straightforward task set to secondary level students – completing chemical word equations with a single omitted term. Chemical equations are of considerable importance in chemistry, and school students are expected to learn to be able to write and interpret them. However, it is recognized that many students find them challenging. The present paper explores students’ accounts of their attempts to identify the missing terms, to illuminate why working with chemical word equations is so challenging from the learner’s perspective. 300 secondary age students responded to a 5-item exercise based on chemicals and types of reactions commonly met at school level. For each item they were asked to identify the missing term in a word equation, and explain their answers. This provided a database containing more than a thousand student accounts of their rationales. Analysis of the data led to the identification of seven main classes of strategy used to answer the questions. Most approaches required the coordination of chemical knowledge at several different levels for a successful outcome; and there was much evidence both for correct answers based on flawed chemical thinking, and appropriate chemical thinking being insufficient to lead to the correct answer. It is suggested that the model reported here should be tested by more in-depth methods, but could help chemistry teachers appreciate learners’ difficulties and so offer them explicit support in selection and application of strategies when working with chemical equations

Learners’ mental models of the particle nature of matter: a study of 16 year-old Swedish science students

The results presented here derive from a longitudinal study of Swedish upper secondary science students’ (16-19 years of age) developing understanding of key chemical concepts. The informants were 18 students from two different schools. The aim of the present study was to investigate the mental models of matter at the particulate level that learners develop. Data was collected using semi-structured interviews based around the students’ own drawings of the atom, and of solids, liquids, and gases. The interview transcripts were analysed to identify patterns in the data that offer insight into aspects of student understanding. The findings are discussed in the specific curriculum context in Swedish schools. Results indicate that the teaching model of the atom (derived from Bohr’s model) commonly presented by teachers and textbook authors in Sweden gives the students an image of a disproportionately large and immobile nucleus, emphasises a planetary model of the atom and gives rise to a chain of logic leading to immobility in the solid state and molecular breakdown during phase transitions. The findings indicate that changes in teaching approaches are required to better support learners in developing mental models that reflect the intended target knowledge

Secondary students' thinking about familiar phenomena: learners' explanations from a curriculum context where 'particles' is a key idea for organising teaching and learning

Particle models of matter are widely recognised as being of fundamental importance in many branches of modern science, and particle ideas are commonly introduced and developed in the secondary school curriculum. However, research undertaken in a range of national contexts has identified significant learning difficulties in this topic, and suggests that notions of particles that match scientific models are generally only attained over periods of some years. The implementation of a National Curriculum in Science in England was followed by increasingly prescriptive guidance to teachers. This culminated in a framework for teaching lower secondary science, which identified ‘particles’ as one of five key ideas for organising teaching and learning of science to all 11-14 year olds. In this curriculum context, a basic particle model is introduced at the start of secondary education, and consolidated by being revisited in various contexts over three years. However National Tests suggest that only a minority of pupils attain levels of understanding matching target knowledge. The present paper reports an interview study that explored how a sample of English secondary students explained phenomena commonly met in school science. It was found that students generally used the notion of particles, although most of their particle-based explanations reflected alternative conceptions that have been reported in previous research. It is concluded that a curriculum strategy of early introduction and regular application during the early secondary years is not of itself sufficient to support the desired progression in thinking with particle models, and more sophisticated research-informed pedagogy is needed

The insidious nature of ‘hard core’ alternative conceptions: Implications for the constructivist research programme of patterns in high school students' and pre-service teachers' thinking about ionisation energy

The present study contributes to the constructivist research programme (RP) into learning science by comparing patterns in responses from two groups of learners - senior high schools students and pre-service teachers - in the same educational context (Singapore), to a diagnostic instrument relating to the topic of ionisation energies. This topic is currently included in the curriculum for 16-19 year-old students studying chemistry in Singapore (and elsewhere). The comparison shows that although (a) graduate pre-service teachers offered some types of incorrect responses less frequently than high school students; (b) they retained high levels of alternative conceptions commonly found among high school students; and - of particular note - (c) certain alternative conceptions were found to be more common among the graduates. This suggest the intuitive appeal of certain alternative conceptions is such that they can readily be reproduced down ‘generations’ of learners. The findings are explored in terms of a range of conceptual resources that have been developed within the constructivist RP. The analysis suggests that the curriculum sets out inappropriate target knowledge for senior high school students, given the nature of the subject matter and the prior learning of the students. It is also suggested that it may be fruitful to consider conceptual learning in terms analogous to the RP found in science, and that from this perspective certain insidious alternative conceptions can be understood as derived from commitments that are taken-for-granted and protected from explicit challenge by a protective belt of refutable auxiliary conceptions

Upper secondary French students, chemical transformations and the "register of models": a cross-sectional study

The purpose of this study is to identify how upper secondary school French students (grade 10 to 12) interpret chemical transformation with regards to the changes within molecules and atoms and in terms of intramolecular and/or intermolecular bond breaking. In order to identify and describe the students' assimilated knowledge, four questions were asked to 930 students using a written questionnaire submitted a long time after the related teaching took place. There is much research into student learning in the concept areas discussed here (atoms and molecules, chemical change, chemical bonding) as reviewed in the paper. The present study presents data from an educational system where limited work has been reported in the international literature. The French system has its own unique curriculum, and is taught in the national language (where much of the existing research has concerned learning in Anglophile systems). The research reported here found that French secondary students experienced many similar difficulties in understanding these key scientific concepts to those that have been reported elsewhere, showing the cross-cultural nature of the key educational issues. However, it is also suggested that some of the specific characteristics identified here are linked to the ordering and language used in the French curriculum, and such cultural idiosyncrasies may offer useful insights into both problematic and valuable aspects of science pedagogy

A global experiment on motivating social distancing during the COVID-19 pandemic

Finding communication strategies that effectively motivate social distancing continues to be a global public health priority during the COVID-19 pandemic. This cross-country, preregistered experiment (n = 25,718 from 89 countries) tested hypotheses concerning generalizable positive and negative outcomes of social distancing messages that promoted personal agency and reflective choices (i.e., an autonomy-supportive message) or were restrictive and shaming (i.e., a controlling message) compared with no message at all. Results partially supported experimental hypotheses in that the controlling message increased controlled motivation (a poorly internalized form of motivation relying on shame, guilt, and fear of social consequences) relative to no message. On the other hand, the autonomy-supportive message lowered feelings of defiance compared with the controlling message, but the controlling message did not differ from receiving no message at all. Unexpectedly, messages did not influence autonomous motivation (a highly internalized form of motivation relying on one’s core values) or behavioral intentions. Results supported hypothesized associations between people’s existing autonomous and controlled motivations and self-reported behavioral intentions to engage in social distancing. Controlled motivation was associated with more defiance and less long-term behavioral intention to engage in social distancing, whereas autonomous motivation was associated with less defiance and more short- and long-term intentions to social distance. Overall, this work highlights the potential harm of using shaming and pressuring language in public health communication, with implications for the current and future global health challenges

Understanding Chemical Bonding: The Development of A Level Students' Understanding of the Concept of Chemical Bonding.

A level chemistry students’ developing understanding of the chemical bonding concept was investigated using a grounded theory approach. Sequences of in-depth interviews with individual students were supplemented by a range of complementary data sources. The thesis presents case studies of two of the students, as well as describing general features that emerged during the research. It was found that several aspects of the orbital concept were not well understood by the students. Students were found to have alternative conceptions of how electrostatic charges interact, and they often failed to appreciate the role of such electrostatic interactions in the formation and breaking of chemical bonds. It was also found that there was widespread use of inappropriate explanatory schemes based upon the notion of a 'full [electron] shell' or 'octet' as the rationale for the occurrence of chemical bonds and chemical reactions. Progression in understanding chemical bonding amongst these A level students largely concerned the transition between this alternative ‘octet thinking and the electrostatic explanatory schemes of curriculum science. This finding is used to provide advice to teachers, text-book authors and science curriculum planners. This thesis contributes to a number of contemporary debates concerning the nature of learners’ alternative ideas in science. It is demonstrated that individual learners do hold coherent and stable explanatory schemes that are inconsistent with curriculum science. Moreover, learners hold multiple frameworks in cognitive structure to explain the same phenomena. It is also shown how, in learning chemistry, alternative conceptions deriving from intuitive theories about the physical world may be less significant than those based on material that is taught incorrectly, or that is presented to learners who do not have the prerequisite knowledge to construct the intended meaning