We have developed computer-based activities for two semesters of introductory or general chemistry that are designed to promote student engagement in the learning process. Although this work was undertaken to enhance collaborative learning in process workshops, the activities contain features that are suitable for use in a variety of teaching and learning contexts. These features include interactive models coupled to critical thinking questions, instant multilevel feedback for exercises and problems, network reporting with utilities for peer assessment, and performance distributions for self-assessment. While the design of these activities is sufficiently general to be employed in a text-based format, student assessments reveal that computers provide significant enhancements to the workshop environment.