English,+Jacob

Motion Detectors: This article has revealed a lot of things that I already knew and did not know. I already new that Albert Einstein won the Nobel Prize for photoelectric effect. I was also aware of two types of the motion sensors. I knew about the photosensors and infrared radiation, but i was unaware of the pulse detector. Another thing that i knew was that snakes have infrared vision. I did not know that radar guns used radio waves or how our vision worked. It turns out that it works kind of like a photosensor.

Jake, Pretty sketchy but OK. MW

Sulfur Hexafluoride: I read the sulfur hexafluoride article and found to to be very interesting. Many of us know about the helium gas that makes your voice high pitched and funny; who knew that sulfur hexafluoride is a gas that can make your voice as deep as the ocean. I also knew that breathing in too much of either gas could make you pass out but i never knew why. It turns out that when you breath the gas in and talk and then breath it in again, you are limiting your oxygen intake, which causes you to pass out. That last thing in the article that i knew was that the helium in balloons leak out quickly, which makes them deflate. What i did not know is that a balloon with sulfur hexafluoride actually gets bigger because outside air leaks into it.

Skipper, I like the deep as the ocean phrase. 5 stars. MW

Dust Explosion Who knew that sugar could be an explosive? In the article it reports an explosion in a sugar plants that killed seven people. It talks about a burning fire ball moving throughout the plant, which would seem amusing in a movie but now that it's reality, it seems scary. Once it can react to the oxygen in the air, BOOM! it does not take much dust to start such a reaction either. Occording to the article it only takes one eighth of an inch to start one and once that starts it stirs the rest of the dust into the air and reacts with that. We might want to grab our broom sticks and start sweeping.

Jake, Good suggestion. but don't wait too long or sweeping will kick up the dust and blow us up! 5 stars. MW

Mole Day The mole is so cool, because it has a day celebrating it. The National Mole Day Foundation was founded in 1991, after an article appeared in __The Science Teacher__ about a science teacher who wanted to celebrate the day. The foundation grew increasenly popular and became a self-supporting organization. The mole was founded by Avogadro, an Italian scientist. An interesting fact about Avogadro is that he was not considered very smart in his lifetime. His work was not really recognized with his work until 50 years after he made his hypothesis. So don’t be dismole and hate on mole day.

Preach on mol man!! MW

Where do Elements Come From? I really enjoyed reading this article. It talks about the birth of the foundation of chemistry. When stars go supernova, it creates many elements, such as hydrogen, helium, and iron. This article showed me that there are different sciences like astronomy, chemistry, and physics, but they are all connected in many ways. I never thought about chemistry having to do with stars, but starts are the things that created the foundation of chemistry. It really fascinated me.

Jake, OK. Cool. 5 stars. MW

Tattoo ink This article talked about the constributions that modern chemistry made to the art of tattoos In the article it talked about how a solid pigment is suspended in a liquid carrier, which could contain various liquids. This can be classified as a mixture. But the real science behind tattoos has to do with the coloration. Various and compounds are used to change the color of the pigment, like cobalt oxides or copper salts. By use compounds, there are many different colors that could be used. Jake, OK. Looks good. 5 stars. MW

Crude Oil 1/27: Crude Oil is related to Chemistry because it is a heterogeneous mixture made out of hydrocarbons, which consists of hydrogen and carbon. The oil is useless as a mixture, so its contents are separated by distillation. Some of the hydrocarbons have different boiling points so the oil can be separated into several substaProxy-Connection: keep-alive Cache-Control: max-age=0 es. This is called fractional distillation. The oil industries use this but on a much larger scales in large distillation towers. The bottom of the tower is heated at 330 degrees Celsius. Hydrocarbons with a lower boiling point condense at the top while the ones with higher boiling point condense toward the bottom.

Jake, OK. Oil is a homogeneous mixture though.

Redefining the Kilogram 1/28: The second, meter, kelvin, and mole are all SI units defined defined by an unvarying physical property of nature. The Kilogram is a very unique SI unit. It is the only one that is still defined by a physical artifact. However the problem is that the standard kilogram lost 50 micrograms of mass. This is a big problem because it wont only through of the mass of a kilogram but all the units based off of the kilograms and through off the measurements of important objects. So, many scientists have discussed using constant standards such as Planck's Constant or Avogadro's Constant, which are both related to the mole measurement. It is widely accepted but has little significance to the rest of the world.

Jake