Then we decided to do an experiment from a Science Experiment Kit that C got for Christmas. The name of the experiment was Rock and Dissolve. The question posed was "Can something as soft as water dissolve something as hard as a rock?"
The end result was that the lemon juice and the vinegar can dissolve chalk, but plain old water cannot. It's the acid in the other two that do the dissolving.
After science time, we worked a little on our Valentines.