Enhancing Student Chemistry Learning by Changing Instructionand Assessment Practices: A Proposal for a Computer Laboratory

建立计算机实验室，对普通化学和有机化学的学生进行化学前、化学后的交互式评估和指导，并为职前高中化学教师提供计算机实验室教学经验。计算机实验室使教师能够通过向学生展示如何将“湿”实验室经验与讲授的概念和实践的实验室技能相结合，从而加强学习。Quicktime电影允许学生展示和质疑那些在实验室里太危险的反应。学生观看，并在Quicktime视频剪辑安全使用实验室设备进行测试。对于实验前的教学，计算机环境为学生提供了一个参与互动提问的机会，以确定他们是否具备成功完成实验所需的知识。“湿”实验室环境是化学的重要组成部分，是计算机设备无法取代的。作为这个项目的一部分，学生们使用计算机接口的实验室方法从“湿”实验室实验中获取和分析数据。实验后的计算机实验室可以作为一个评估学生对实验材料学习情况的地方，以扩展他们的学习，并在发现不足时指导进一步的工作。该设施还为职前教师提供了开发和使用教学和评估材料的途径，以促进化学学习。为期两年的实施期间包括形成性和总结性评估，以加强项目中使用的教学和测验实践。该项目的材料正在通过计算机（万维网）、研讨会和印刷品向其他人提供。

A computer laboratory is being developed for interactive pre- and post-chemistry laboratory assessment and instruction of students in general and organic chemistry, and to provide computer laboratory teaching experiences for preservice high school chemistry teachers. The computer laboratory enables teachers to reinforce learning by showing students how "wet" laboratory experiences can be integrated with lecture ideas in terms of concepts being covered and laboratory skills being practiced. Quicktime movies allow presentation of, and questioning about, reactions that are too dangerous to have students do in the laboratory. Students view, and are quizzed on, Quicktime video clips on safe use of laboratory equipment. For prelaboratory instruction, the computer environment provides an opportunity for students to take part in interactive questioning to determine whether they have the knowledge needed to complete the laboratory successfully. The "wet" laboratory environment is an important part of chemistry that is not to be replaced by computer facilities. Students are using calculator interfaced laboratory methods of acquiring and analyzing data from "wet" lab experiments as a part of this project. The postlaboratory computer lab can be a place for students to be assessed on their learning of the laboratory material, to extend their learning, and to be guided by further work if deficiencies are revealed. The facility also provides preservice teachers an avenue for developing and using instructional and assessment materials to facilitate chemistry learning. The 2-year implementation period includes both formative and summative evaluations that enhance instruction and quizzing practices used in the project. Materials from the project are being made available to others through computers (World Wide Web), workshops, and print.