Susan makes the following entry in her notebook: “On Friday we were given a blue liquid in a shallow container. We placed it on the windowsill over the weekend. On Monday morning, there was no liquid left, but the dish had some solid blue stuff in it.” a. Was the blue liquid in the dish a heterogeneous mixture, a solution, or a pure substance? Explain your choice.

b. Write a few sentences about what you think happened in the dish.