Physical Science has activities for Solids, Liquids and Gases. Working through the properties of each state of matter. On the MAP test students will have to be able to describe and compare properties of matter. Being able to find attributes of objects and sort other objects according to their attributes. One and more than one attribute are usually involved.
Teachers usually have the students sort objects by using the five senses.
I would suggest you put the chocolate in a baggie first. I can give you other activities, but this should get you started.