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This is a pretty neat concept! Users can scroll through various organic reagents and have them react with the inorganic compounds above. Once a reaction occurs, a new set of reagents will appear and the process repeated. I find that if an activity involves a time-crunch or a score, that students are more competative and then become more focused on the activity. Speeds can be adjusted to change difficulty.
The system is rather simple and only pertains to reactions involving inorganic reagents with organic reagents (i.e. LiAlH with a ketone).