SG/Chem Blog 5

Over the last week in sustainable green chemistry I will be honest, we didn't do that much. For the first half of the week, we were very busy with our unit one exam and the PSAT. In the second half of the week we started unit two, unit two is focused on energy and movement of molecules.

Part 1: Testing

On Monday we spent the day reviewing everything that we have learned. This included histograms, significant figures, and how to read graphs to name a few.

*The board we made with everything we have learned*

To do our review, each table filled out a whiteboard with everything that we did. We then compared whiteboards and presented then to the class, I think that this form of review was very successful because it made us think of everything and then if we didn't remember something we were able to see what it was, and how it relates to the other stuff we learned. My groups whiteboard had everything it needed and I think my table and class did a good job overall on the unit one exam.

Part 2: Energy and molecules 

To start off our second unit we began studying the movement of molecules and how the movement is affected by energy.

The first experiment we did showed that heat energy affects the speed that particles move. To do this, we had a glass of hot water and a glass of cold water. We used a dropper to place green food coloring into both glasses. We then watched the dye spread through the cups, we found that the due spread faster through the hot water than the cold water. This leads us to believe that the heat energy increases the speed at which particles move. After we did the experiment, we created whiteboards of what we believed happened. Every groups model showed the spread of dye in a slightly different way.

On Friday, we watched a series of videos called Eureka, the videos explained the movement of molecules (Latin for "Little Lumps") as a dance where the particles are attracted be repulsed. The videos also talked about how liquids turn into gasses at high temperatures. Liquids do this because as the temperature increases, so does the speed at which the particles move, the speed increases until they break free of their bonds with the other molecules. The same process also happens when going from solids to liquids.

Part 3: Conclusion

This week, we were really busy but, we didn't get a lot of science done. I hope we get to get a lot more done next week. What we did learn is very important and will help us understand the rest of unit two.

What we learned:

-particles move faster when they have more heat energy

-molecules move at all times