Web-based Interactive Organic Chemistry Homework

化学（12）基于网络的程序有可能改变科学的教学方式，但教师投资所需的时间和资源，采用他们，这样的程序必须有更大的教学价值比传统方法。基于Web的交互式有机化学程序，ACE有机（以前的EPOCH），是独特的有用的几个方面。ACE通常要求学生画出一个化学结构或一系列化学结构，如果学生的回答不正确，ACE会提供反馈，解释为什么回答不正确，并提出建议，指导学生找到正确的答案。 在过去的2.5年中，ACE增加了许多新的问题类型，并于2007年初纳入ACE的商业版本。 问题类型包括机械问题，学生现在可以像在纸上一样画出化学结构的序列和代表电子流动的弯曲箭头;构象问题，学生现在可以用三维信息画出或修改化学结构;其中刘易斯结构题的标准绘图工具MarvinSketch（注册商标），自动添加未共享电子和隐含的H原子，并提醒学生注意化合价错误，同时开发了一种新的，化学意识更低的绘图工具，允许学生绘制（正确和不正确）刘易斯结构;标记原子的问题，学生现在可以标记结构中的原子，最酸性，最亲核性等，或者他们可以标记每个立体原子，或者他们可以根据其杂化或立体定向性标记每个原子;以及多项选择、填空（具有下拉菜单）和按顺序排列的问题。 在该项目下，正在将多步综合问题添加到ACE中。 给学生一个目标，一个允许的起始材料的描述，和一组允许的试剂，他们设计和绘制一个多步合成方案。 此外，正在进行一项扩大的评估，以确定这些问题类型在提高学生的课程成绩方面的有效性。第三方对ACE的初步评估表明，ACE确实对学生的有机化学理解和能力产生了可衡量的积极影响。智力价值：本项目继续开发和评估基于Web的有机化学家庭作业程序，该程序已经具有比迄今为止开发的任何程序更大的功能。更广泛的影响：ACE计划是一个独特的有价值的教学和学习工具，适用于各种学科的大量学生学习的困难课程。 这个项目将ACE的范围扩展到有机化学课程材料的关键部分。 与培生教育的普伦蒂斯霍尔分部的伙伴关系将允许广泛传播ACE的未来版本。

Chemistry (12)Web-based programs have the potential to change the way science is taught, but for instructors to invest the time and resources required to adopt them, such programs must have greater pedagogical value than traditional methods. The Web-based interactive organic chemistry program, ACE Organic (formerly EPOCH), is uniquely useful in several ways. ACE generally requires a student to draw a chemical structure or a sequence of chemical structures, and, if a student's response is incorrect, ACE provides feedback that explains why the response is incorrect and makes suggestions to guide the student to the correct answer. Over the last 2.5 years, a number of new question types were added to ACE, and these were incorporated into the commercial version of ACE in early 2007. Question types included mechanism questions for which students can now draw a sequence of chemical structures and curved arrows representing electron flow, just as they do on paper; conformation questions for which students can now draw or modify a chemical structure with three-dimensional information; Lewis structure questions for which the standard drawing tool, MarvinSketch (trademarked), adds unshared electrons and implicit H atoms automatically and alerts students to valence errors, while a new, much less chemically aware drawing tool has been developed that permits students to draw (correct and incorrect) Lewis structures; label-the-atom questions for which students can now mark the atom in a structure that is most acidic, most nucleophilic, etc., or they can mark every stereogenic atom, or they can label every atom according to its hybridization or stereotopicity; and multiple-choice, fill-in-the-blank (with pulldown menus), and rank-in-order questions. Under this project multistep synthesis questions are being added to ACE. Students are given a target, a description of permissible starting materials, and a set of permissible reagents, and they design and draw a multistep synthetic scheme. In addition, an extended evaluation is being carried out to determine the effectiveness of the question types in improving students' performances in courses. Preliminary evaluations of ACE by third parties have suggested that ACE does have a measurable and positive effect on students' understanding of and ability in organic chemistry.Intellectual merit: This project continues the development and evaluation of a Web-based homework program designed for organic chemistry that already has far greater capabilities than any program heretofore developed. Broader impacts: The ACE program is a uniquely valuable teaching and learning tool for a difficult course that is taken by large numbers of students across a wide variety of disciplines. This project expands the scope of ACE to a critical portion of the organic chemistry course material. The partnership with the Prentice Hall division of Pearson Education, which funded much of the initial development of ACE and continues to invest in its support and evaluation, will permit wide dissemination of future versions of ACE.