Homework: Webassigns due Wednesday, September 21st
Lab: The server was down on Friday, so we didn't end up watching the videos Mr. Paek had planned for us, so we went straight to the lab.
In the lab, entitled "Matter Lab Stations", we drew a picture of what we saw at each station (black, yellow, and green spheres that represented elements and molecules), wrote the chemical formulas of what was present (black=carbon, yellow=hydrogen, green=oxygen), and then compiled a list of which terms applied to that station.
Demo: After the lab, Mr. Paek did a demo to introduce the concept of physical and chemical changes -
This demo is an example of a chemical change, because (iodine) molecules are being broken apart. Wikipedia's definition of a physical change is changes that occur when objects or substances undergo a change that does not change their chemical nature. Another trick that Mr. Paek tought us when contemplating whether it is physical or chemical is to ask: "Can you get it back?" For instance, when you rip a piece of paper in half, you can simply get it back by taping the two pieces together (physical change). In contrast, if you were to burn the piece of paper, (chemical change) you can't get it back. This is an example of how combustion always results in a chemical change.
**We have that science test that everyone has to take on Tuesday, September 20th. Don't worry, it's not for a grade!
Next scriber is John B! (Sorry, completely random)
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