远程学习:瑞利散射的跨学科实验

IF 2.2 Q2 EDUCATION, SCIENTIFIC DISCIPLINES Chemistry Teacher International : best practices in chemistry education Pub Date : 2022-06-01 DOI:10.1515/cti-2022-0006
Hortensia Natalia Pérez-Vallejo, M. A. Contreras-Ruiz, J. G. Ibanez
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引用次数: 3

摘要

为应对新冠肺炎疫情,我校采取了保持社交距离的措施,将化学试剂送到学生家中进行远程实验。这使得在选修化学课程的2020年秋季和2021年春季学期中,每人可以进行~ 25次实验。学生们被要求设计一些他们自己的实验,然后让整个小组复制它们。其中一个实验是通过溶液酸化使胶体硫阳极间接发电产生硫代硫酸盐歧化。众所周知的瑞利散射现象证明了这一点。在这里,光的轨迹和偏振状态是通过它与含有直径小于入射光波长的粒子的介质的相互作用而改变的。如果白光与这种介质相互作用,波长较短的光(如蓝色、紫色)就会呈放射状散射,而波长较长的光(如橙色、红色)则会穿过悬浮液。这种散射是美丽的日落和蓝天的原因,它是通过间接的电化学过程产生的,这种过程会产生胶体硫。学生们证明了简单的手机手电筒发出的光的散射。整个过程在一个2小时的课堂上完成。主要的学生成果呈现。
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Distance learning: an interdisciplinary experiment on Rayleigh scattering
Abstract As a result of social distancing measures in response to the Covid-Sars 2 pandemic, our school sent chemistry kits to the students’ homes for remote experimentation. This allowed the performance of ∼25 experiments per person in each of the Fall 2020 and Spring 2021 semesters in an elective chemistry course. Students were requested to design some experiments of their own and then have the entire group reproduce them. One such experiment consisted of the anodic indirect electrogeneration of colloidal sulfur by solution acidification to produce thiosulfate disproportionation. This was evidenced by the well-known Rayleigh scattering phenomenon. Here, the trajectory and polarization state of light are modified by its interaction with a medium containing particles of smaller diameter than the wavelengths of incident light. If white light interacts with this medium, the smaller wavelengths (e.g., blue, violet) are radially scattered while the longer wavelengths (e.g., orange, red) pass through the suspension. Such scattering is responsible for beautiful sunsets and blue skies and is produced here by an indirect electrochemical process that generates colloidal sulfur. Students evidence the scattering of light shone from simple cell phone flashlights. The entire procedure is performed in a 2-h class session. Key student outcomes are presented.
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