初级科学中的原子,分子,光子和声子

David Wood
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摘要

传统的科学教育智慧表明,抽象概念超出了大多数小学生的能力范围。这包括引入原子和分子。“爱因斯坦第一”课程通过歌曲、角色扮演、用橡皮泥和嵌有磁铁的球制作的简单原子模型,向三年级学生介绍原子和分子。他们使用这些模型和类比,将他们在宏观层面上看到的东西与原子和分子的微小结构以及将它们结合在一起的电力联系起来。在这个早期阶段,我们特别注重让学生熟悉现代科学的语言:原子、分子和光子。我们面临的挑战是引入一个原子模型,这个模型既要忠实于原子的量子和概率性质,又要避免几乎主导所有入门化学的行星型轨道的误解。相反,我们展示了从互联网上容易获取的电子轨道美丽复杂的图像。我们把原子描绘成一个由质子和中子组成的微小原子核,原子核周围环绕着电子云,而电子云中的电子“就在那里的某个地方”。本演讲将简要概述我们的螺旋学习方法,在这种方法中,三至六年级的学生将在四年的小学教育中重新审视和发展概念。他们将在小学毕业时,对光子和声子、状态变化(三年级)、材料的物理性质(四年级)、物质的状态(五年级)以及材料的简单可逆和不可逆变化有清晰的概念。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Atoms, molecules, photons and phonons in primary science
Traditional science education wisdom suggests that abstract concepts are beyond the majority of primary-school aged students. This includes introducing atoms and molecules. The Einstein-First curriculum introduces atoms and molecules into Year 3 via songs, role plays and simple atomic models made from plasticine (modelling clay) and balls with embedded magnets. They use these models and analogies to relate what they see at a macroscopic level to the miniscule structures of atoms and molecules, and the electrical forces that hold them together. At this early stage, we concentrate particularly on students becoming familiar with the language of modern science: atoms, molecules and photons. The challenge is to introduce an atomic model that is faithful to the quantum and probabilistic nature of atoms and yet avoids both the misconceptions of planetary type orbitals which dominate almost all introductory chemistry. Instead we show easily accessible images from the internet of the beautiful complexity of electron orbitals. We present atoms as a miniscule nucleus of protons and neutrons surrounded by an electron cloud in which the electrons are ‘in there somewhere’. This presentation will concisely outline our spiral learning approach in which students in Years 3 to 6 will revisit and develop concepts throughout four years of primary education. They will leave primary school with clear concepts of photons and phonons, changes of state (Year 3), physical properties of materials (Year 4), states of matter (Year 5) and simple reversible and irreversible changes to materials.
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