Stacey Lowery Bretz

A rubric to characterize inquiry in the undergraduate chemistry laboratory

Consensus does not exist among chemists as to the essential characteristics of inquiry in the undergraduate laboratory. A rubric developed for elementary and secondary science classrooms to distinguish among levels of inquiry was modified for the undergraduate chemistry laboratory. Both peer-reviewed experiments in the literature and commercially available experiments were evaluated using the rubric, revealing a diversity of uses for the word inquiry. The modified rubric provides a valid and reliable standard of measure for chemists to examine their laboratory curriculum. [Chem. Educ. Res. Pract., 2007, 8 (2), 212-219.]

Development and Assessment of A Diagnostic Tool to Identify Organic Chemistry Students’ Alternative Conceptions Related to Acid Strength

The central goal of this study was to create a new diagnostic tool to identify organic chemistry students’ alternative conceptions related to acid strength. Twenty years of research on secondary and college students’ conceptions about acids and bases has shown that these important concepts are difficult for students to apply to qualitative problem solving. Yet, few published studies document how students’ prior knowledge of acids influences their understanding of acid strength in organic chemistry contexts. We developed a nine-item multiple-tier, multiple-choice concept inventory to identify alternative conceptions that organic chemistry students hold about acid strength, to determine the prevalence of these conceptions, and to determine how strongly these conceptions bias student reasoning. We identified two significant alternative conceptions that organic chemistry students hold about acid strength. Students who answered items incorrectly were more confident about their answers than peers who answered items correctly, suggesting that after one semester of organic chemistry, students do not know what they do not know. Implications for the teaching of acid strength are discussed.

Impact of a spiral organic curriculum on student attrition and learning

At Miami University, the attrition rate in the year-long organic chemistry sequence for pre-medical majors typically ranges from 30-50%. To decrease attrition, the Department of Chemistry and Biochemistry developed an innovative, spiral curriculum. Unlike a traditional organic chemistry course that moves sequentially through the material, the spiral approach provides students with a broad, general overview of organic chemistry during the first semester, followed by exploration of important topics in more detail during the subsequent semester. A qualitative, case-study approach using interviews and reflective essays documented the experiences of eighteen students as they progressed through this spiral curriculum. This paper describes the strengths and weaknesses of the spiral approach, its impact on student attrition, results from ACS exams, and suggestions to improve the model.

Generating Cognitive Dissonance in Student Interviews through Multiple Representations.

This study explores what students understand about enzyme–substrate interactions, using multiple representations of the phenomenon. In this paper we describe our use of the 3 Phase-Single Interview Technique with multiple representations to generate cognitive dissonance within students in order to uncover misconceptions of enzyme–substrate interactions. Findings from 25 student interviews are interpreted through the lens of multiple theoretical frameworks, including personal constructivism and coherence formation. The importance of classroom teachers engaging students in dialogue about representations is discussed.

Development of the enzyme–substrate interactions concept inventory†

Enzyme function is central to student understanding of multiple topics within the biochemistry curriculum. In particular, students must understand how enzymes and substrates interact with one another. This manuscript describes the development of a 15‐item Enzyme–Substrate Interactions Concept Inventory (ESICI) that measures student understanding of enzyme–substrate interactions. The validity and reliability of ESICI data were established through multiple methods. Results from the administration of the ESICI to biochemistry students across the United States (N = 707) are discussed in terms of instrument quality. The manuscript concludes with suggestions for how to use the ESICI for both teaching and biochemistry education research.

Enhancing the role of assessment in curriculum reform in chemistry

The role of assessment in the chemistry classroom is ultimately tied to the nature of the assessments available for use. Because they provide data that can inform decisions about curricular changes, or new pedagogies, the incorporation of new assessment strategies can play an important role in how educational and curriculum reform is carried out. Several recent developments in assessment have been tied together to investigate the benefits of using multiple assessment strategies in decision making about teaching innovation. These new tools include measures of student problem solving, metacognition, cognitive development within the chemistry content at the college level and evaluation of students in affective aspects of learning. Summaries of how these new tools may be combined and what measures arise from such combinations are presented.

Perry’s Scheme of Intellectual and Epistemological Development as a framework for describing student difficulties in learning organic chemistry

We have investigated student difficulties with the learning of organic chemistry. Using Perry’s Model of Intellectual Development as a framework revealed that organic chemistry students who function as dualistic thinkers struggle with the complexity of the subject matter. Understanding substitution/elimination reactions and multi-step syntheses is consistent with subsequent epistemological development to Perry’s multiplistic and relativistic stages.

An expanded framework for analyzing general chemistry exams

This paper describes an expanded framework to aid chemical educators in constructing exams for their courses. The framework has three primary levels: definition, algorithmic, and conceptual. These primary levels have often been used in chemical education research to analyze and describe exam questions, but in this study the definition, algorithmic, and conceptual primary levels have expanded secondary levels.

Modeling meaningful learning in chemistry using structural equation modeling

Ausubel and Novaks construct of meaningful learning stipulates that substantive connections between new knowledge and what is already known requires the integration of thinking, feeling, and performance (Novak J. D., (2010), Learning, creating, and using knowledge: concept maps as facilitative tools in schools and corporations, New York, NY: Routledge Taylor & Francis Group.). This study explores the integration of these three domains using a structural equation modeling (SEM) framework. A tripartite model was developed to examine meaningful learning through the correlational relationships among thinking, feeling, and performance using student responses regarding Intellectual Accessibility and Emotional Satisfaction on the Attitudes toward the Subject of Chemistry Inventory version 2 (ASCI V2) and performance on the American Chemical Society exam. We compared the primary model to seven alternatives in which correlations were systematically removed in order to represent a lack of interconnectedness among the three domains. The tripartite model had the strongest statistical fit, thereby providing statistical evidence for the construct of meaningful learning. Methodological issues associated with SEM techniques, including problems related to non-normal multivariate distributions (an assumption of traditional SEM techniques), and causal relationships are considered. Additional findings include evidence for weak configural invariance in the pre/post implementation of the ASCI(V2), mainly due to the poor structure of the pretest data. The results are discussed in terms of their implications for teaching and learning.

Investigating the relationship between faculty cognitive expectations about learning chemistry and the construction of exam questions

We have investigated chemistry faculty’s cognitive expectations about learning chemistry and their influence upon the construction of exam questions in a general chemistry curriculum. Faculty cognitive expectations for learning chemistry were measured using QUIMX. Learning objectives and exam questions for a year-long general chemistry sequence were classified according to Bloom’s Cognitive Taxonomy and the Expanded Framework for Analyzing General Chemistry Exams. Analyses revealed correlations between learning objectives and the type of exam questions. Faculty cognitive expectations correlate with the algorithmic or conceptual nature of exam. The findings suggest that incorporating more conceptual assessment requires faculty to articulate explicitly their cognitive expectations and integrate them into the writing of learning objectives.