Friday October-1-2010

To start class Mr. Paek went over the previous days scribe post. Then he started giving us notes in the papers labeled Atomic Models. Then we started the fireworks lab.

PreLab: when electrons drop DOWN an energy level, they give off a specific amount of energy in the form of electromagnetic radiation. This energy then strikes our eye, causing chemical reactions in the eye that excite neurons and thus we perceive color. The electrons for metals in particular have energy levels far enough apart to cause colors in the visible spectrum

What does the statement, “Electrons can become excited,” mean?

The purpose was to observe the different quantum leaps of electrons in several metal salts. Basically at each lab station, there were cups of different salts, metal splints and a Bunsen burner. When we got the splint wet, we covered the end with salt, and stuck it into the flame. Depending on the salt, the flames changed colors like bright red, blue/green and others.

On the lab sheet, you had to describe the specific color given off by each metal salt and the go to the front of the room where Mr. Paek had 3 different unknown salts that he showed us on the bunsen burner and depending on the color and our resulfs from the other lab stations, had to deduct what they were. the bell rang before we finished the post lab questions so Mr. Paek just said we'd go over those on Monday. Happy Homecoming!