Layered Curriculum Day here in Chemistry class. Four Lab stations, four different labs going on, all kids engaged in science. One pair working on determining which of 5 different ionic compounds are exothermic or endothermic, another is determining the heat of fusion of candle wax. A different group is calculating the number calories consumed by an alcohol burner and a third is prepping a lab for next class by melting mass quantities of wax in a water bath and weighing out equal test tube fulls of the stuff.
I am starting them to clean up and have no grading to take home. Sounds good to me.