Equipment for a Laboratory Exercise in Geochemical Kinetics

小行星9351010 一套配备有热台的显微镜正在被用来开发和校准一个简单的，创新的实验室活动的矿物溶液反应的温度依赖性（阿克里乌斯活化能）。 该练习使本科矿物学/地球化学课程的学生能够直接测量不同温度下的反应速率，同时使他们能够观察反应过程中颗粒表面形态的演变。 这大大提高了学生对与地质科学直接相关的化学动力学的几个基本原理的理解，包括扩散、反应速率的温度依赖性以及限速机制与晶体表面形态之间的关系。 实验练习是生成动态（实时）地球化学速率数据，然后学生使用这些数据来增强传统的定量作业练习。此外，该设备正被用于校准技术上复杂得多的演习版本。 任何拥有显微镜、热板、烧杯、温度计和秒表的地质部门都可以进行同样的工作，而无需对专用设备进行大量投资。 *y

9351010 Velbel A suite of microscopes equipped with thermal stages is being used to develop and calibrate a simple, innovative laboratory activity on the temperature dependence (Arrhenius activation energy) of mineral-solution reactions. The exercise is enabling students in undergraduate mineralology/geochemistry courses to directly measure reaction rates at various temperatures while simultaneously allowing them to observe the evolution of grain-surface morphology during the reaction. This is greatly improving student understanding of several basic principles of chemical kinetics directly relevant to the geological sciences, including diffusion, the temperature dependance of reaction rates, and the relationship between rate-limiting mechanisms and crystal-surface morphology. The lab exercise is generating dynamic (real-time) geochemical rate data which students then are using to augment traditional quantitative homework exercises. Furthermore, the equipment is being used to calibrate a technologically much less complicated version of the exercise. Any geology department with microscopes, hot plates, beakers, thermometers, and stopwatches can perform the same exercise without the necessity of massive investments in dedicated equipment. ***y