Carla Morais

Abstract The Beer-Lambert law is a fundamental relationship in chemistry that helps connect macroscopic experimental observations (i.e., the amount of light exiting a solution sample) to a symbolic model composed of system-level parameters (e.g., concentration values). Despite the wide use of the Beer-Lambert law in the undergraduate chemistry curriculum and its applicability to analytical techniques, students' use of the model is not commonly investigated. Specifically, no previous work has explored how students connect the Beer-Lambert law to absorption phenomena using submicroscopic-level reasoning, which is important for understanding light absorption at the particle level. The incorporation of visual-conceptual tools (such as animations and simulations) into instruction has been shown to be effective in conveying key points about particle-level reasoning and facilitating connections among the macroscopic, submicroscopic, and symbolic domains. This study evaluates the extent to which a previously reported simulation-based virtual laboratory activity (BLSim) is associated with students' use of particle-level models when explaining absorption phenomena. Two groups of analytical chemistry students completed a series of tasks that prompted them to construct explanations of absorption phenomena, with one group having completed the simulation-based activity prior to the assessment tasks. Student responses were coded using Johnstone's triad. When comparing work from the two student groups, chi-square tests revealed statistically significant associations (with approximately medium to large effect sizes) between students using the simulation and employing particle-level reasoning. That said, submicroscopic-level reasoning did not always provide more explanatory power to students' answers. Additionally, we observed the productive use of a variety of submicroscopic light-matter interaction models. We conjecture that engaging with BLSim provided new submicroscopic-level resources for students to leverage in explanations and predictions of absorption phenomena.

Abstract Undergraduate arts and design programs have been incorporating computing education into their curricula. Through a documentation analysis of the first cycle (i.e., bachelor’s) curricula of fered by the Portuguese public education subsystem in the 2018-19 academic year, we identified 40 programs from diverse artistic and design areas, attended by around 5,600 students, which contained at least one course covering computer programming. In a subsequent qualitative analysis of the syllabi of those 128 courses we had identified as relevant, we characterized the objectives, the contents, and the teaching and assessment methods for computing in higher arts education. In the face of the skepticism the literature expresses regarding the validity and robustness of brief approaches to computing, we found most undergraduate programs dedicate few courses or credits (i.e., ECTS) to the topic. We also found programs that introduce the topic late in the curriculum, at a stage when it is likely to meet less dedication from the students. At course level, we note the prevalence of the objective of granting autonomous learning skills to students, which often translates into contents too broad to approach in a non-superficial way. Moreover, we alert to the use of project-based assessment methods in ways that do not assure learning of the contents. With this article we hope to provide an overview of the current situation and contribute to a reflection and a debate about the relevance and the way computing is covered within arts and design education. © (2024), (Emerson de Pietri). All Rights Reserved.

Abstract Activities with Parents on the Computer are pedagogical tasks based on socially relevant disciplinary content with the aim of establishing the school-home connection and collaboration between parents and students, to promote digital literacy and literacy in a specific domain. This article addresses a study that aimed to investigate the contribution of the Activity with Parents on the Computer "NanoAPC", both for the development of knowledge of 8th grade students about the area of nanotechnology, and to raise awareness among parents/guardians for the said area. The activities were proposed in a formal learning environment, the school, but were carried out at home by the student and one of the parents or guardian. NanoAPC intended to help students to learn Chemistry contents contextualized with the advances and applications of nanotechnology in society, from a socio-scientific perspective. A quasi-experimental research plan was implemented, with 58 students and 58 parents/guardians participating. Students were divided into two experimental conditions that were tested: groups 1 and 2, subject to NanoAPC, but with a different initial intervention, and group 3, subject to an activity sheet. All groups were subjected to a questionnaire as a pre-test and post-test, respectively before and after the intervention. The results, resulting from the analysis of the pre-test and post-test and the answers given in the respective activity sheets, show that the students in groups 1 and 2 showed a significant improvement in their knowledge of nanotechnology compared to those in group 3. We conclude that the NanoAPC digital resource is useful for teachers who show an interest in addressing nanotechnology but who have time constraints due to curriculum management. In addition, it promotes the parent-student-computer triangulation and, consequently, raises parents' awareness of this area. © 2024 Universidade Federal do Rio Grande do Sul, Instituto de Fisica. All rights reserved.

Abstract In a society heavily influenced by technological advancements, developing scientific and technological literacy among young people is essential. Along these lines, this research describes a STEM activity developed to promote the teaching of chemistry content related to the solubility of potassium nitrate in water. It also facilitated the mastery of technological skills such as programming Arduino microcontrollers and using Microsoft Excel as tools for automatic data acquisition and analysis. Eighty pre-university Chemistry students participated in this research. This pedagogical approach was divided into three main stages: (1) preliminary research on components used in the experimental apparatus; (2) introduction to the assembly of electrical circuits and Arduino programming; (3) experimental investigation of the dependence of potassium nitrate solubility on temperature. The activity allowed the students to successfully achieve the proposed chemistry learning objectives while mobilizing other scientific and technological knowledge and skills. Despite the students' limited prior knowledge of programming and electronics, as well as their limited proficiency in data analysis software, the integration of programming in the Chemistry class proved to be a differentiating factor with a highly positive impact, particularly in terms of motivation and interest among most students.