Salt Crystal Lab

In the salt crystal lab, the students are growing crystals from three types of salt: iodized table salt, un-iodized table salt, and Epsom salt. Each group prepared a saturated salt solution, added food color, and then poured each solution into each half of a Petri dish (one half contained a sponge and the other was empty). See pictures from one group from each class.

For this lab, I gave an overview of the procedure while the students were at their desks. I also had them answer three questions before the could get the boiling water that they needed to make the salt solutions. My goal was to get them to listen, read, and pay attention. I think the lab went well, but it's difficult to get everyone to listen to and/or read the instructions before they start the lab. Hopefully everyone will have salt crystals next Monday.

Slime Lab

The planning and execution of my first chemistry lab was an experience. The planning went well, I had enough supplies for both classes, but I didn't factor in that some of the students would make mistakes and have to start over.

For this lab, the students were organized into eight groups of four. Each group had to make four types of slime: floam, silly putty #1, silly putty #2, and slime; each student in the group made one type of slime.

Overall, the students were excited to do the lab and they had fun making something that they could take with them. They students were able to take their slime home in a resealable sandwich bag. Quite a few of them didn't follow the instructions, so their slime, floam, or silly putty didn't come out right.

I think next time, I'll go over the procedure before I send them back to their lab stations.

Planning a slime experiment

The students have finished a section on the periodic table and are moving into chemical and physical changes. Next week I am planning a slime lab, where the students will be divided into eight lab groups and each person in the group will make a different type of slime. Differences in the properties of the slime are determined by the added materials beyond the basic materials of borax and white glue solutions. Slime variations are created by adding polystyrene beads, cornstarch, soluble fiber (such as metamucil) or cornstarch and vegetable oil.