Sanchez,+Aaron

Motion Detectors

I know that motion sensored lights are used everywhere. We have many motion detectors in out classrooms for the light. Most motion detectors use infared radiation emitted from out bodies to pick up heat signatures and to place us in the eye of the camera to pick up the motion. I also new about the motion detectors for garages and things like that that use infared radiation to detect the movement of something but the only difference is that instead of a camera picking up a heat signatures it uses the infared to pick up a break in the laser if that may occure. I did not remember what kinda of process the motion sensors used which would be the photoelectric electric effect thought of and produced by Mr. Albert Enstien. I also learned that when a certain frequency of energy hits a sendor like that it knocks one of the electrons off anf out of the eqaution.

Aaron, Looks good. I like your reference to Einstein. 5 stars. MW

Aaron Sanchez

Distillation

I thought the actual technique and distillation method they used was quite interesting. I assumed that to separate oil they would use a straight flame instead of starting it off with a "hot bath" also the design of the flask and connection of the pieces. I knew that change the crude oil into clean oil that can be used to operate machinery such as cars and engines though I did not know that they distilled the oil to make it engine oil especially the fact that the have to do that on such a mass scale and make the process happen over and over again very quickly. The experiment we did in the back of the class took awhile to heat up and get the process going as well the actual drainage of the lower boiling point substance, so I am not entirely sure how they do it so quick and on such a mass scale.

Aaron Sanchez.

Aaron, Well written! This process is a huge and messy industry. Oil refineries are expensive and smelly. :) 5 stars MW

Intro to Chem

I read the article about salting the roads I had obviously seen the local pendot men out laying down salt. I have also seen them out before the storm even hit laying down diceing salt to keep the roads from freezing from the snow but I did not know the chemical change behind the prevention of the formation of ice. I never really thought about it before how the snow that melted into water would dissolve the salt causing the solution to change making the freezing point lower. I also thought it was interesting that the melting process happens only when the reactive surface of the pure ice touches the surface of the salt crystals, reacting in such a way that the ice then melts into water that then forms the solution of salt water making the freezing point lower like when preventing the formation. I know from media and my own prior knowledge that conditions in Alaska are harsh with wintery conditions, however I have learned now that they can't get all of the snow and ice off of the road (previously I had not thought they could) so they use gravel and sand to add traction to the treacherous roadways. My overall all opinion on the article is that I really did enjoy it, I learned some new interesting facts that I didn't know.

Aaron Sanchez

Aaron,

OK. Looks good. That article is one we often read in AP Chemistry. 5 stars. MW