Students will be detectives and decide whether matter is a solid, liquid, or a gas.
Have 12 stations set up with various matter in jars (you decide what to put in them). Students will go around with this list and use what they know about the three states of matter to determine which category each jar belongs to. Then they will write evidence of properties for each.
The second investigation is to build vocabulary around the properties of translucent, transparent, and opaque. Give students 3 squares of different material (plastic Ziploc material, construction paper, and wax paper). They will determine which material matches the font and give a definition for what they have discovered.
The third investigation will be using the new terms to decide which of the jars are which, in a similar manner to the first investigation.