Lee,+Amanda

__Classification of Matter:__ The second and third grapics were pretty much the same in how they both broke down the classifications. I liked them both better then the first because it was more organized, and easier to read. I like how the third one gave examples so it was easy to learn the different classifications. The first one was okay, but it would be good if i was trying to classify different things. But overall the third picture was my favorite.

Amanda, Your response to Steph Starr was a bit too short. MW

__Seperation of Matter:__ I liked the lab, I liked how it showed the different color and pigments. My groups pigments didn’t separate as much as some of the others, I don’t think that we put enough pigment on the paper. I also did something similar in Mrs. Rafferty's class a few years ago. In her class, we did a black sharpie and a penny. I didn't know how gas was made. I thought gas was just filtered and sold, not distilled into so many different things.

__Measurement:__ Measurement is important to me because if im driving and someone misjudges the space in between cars, there could be a crash. Also if im parking and i miss the curb or pull too close to a car i will hit my car or somethhing worse. Another example would be if i was getting my hair cut and i asked for 3 cm off and they cut off six i would be very mad.

Amanda, I like the hair thing but I don't think anyone actually measures the distance between cars. MW

__Kilogram:__ I thought that this article was a bit too over my head. I understand and agree that the one standard mass could have room for error. I think like the meter, they should have an easier way to have a standard kilogram, like a laser light or something more accurate then models. I didn't understand how Agravado's constant works, like you have to round it in a number divisible by 12, but i think that is for higher levels of chemistry anyway.

__Airport Security__:

This article showed how important densities are in real life. I thought that it was neat how they use the density to determine if an item was a bomb or not. The only thing i don't like is how they determine if it really is a bomb or not. I don't know anything about bombs... but if a personal item had the same density, they would have to confiscate it. I also didn't know that the xrays were scanning the densities of items when they went through, i thought it was only an xray.

__Moleday:__

I thought that the website was interesting. I didn't know you could do so much with the mole. Like all the mole terms and songs that they had on their website. At first it was hard to find something educational within the site, but looking through they had an extensive article on Avogadro. I didn’t know that Avogadro was actually a physicist, not a chemist. Also it was interesting that it took scientists 50 years after Avogardo’s death to finally begin to recognize the work that he did for chemistry.

Amanda, Some consider physics the only true science all other pursuits are just off shoots of physics. MW

__Dust Explosion__

This article is about an explosion in a sugar factory. According to the experts in the article, an eighth of an inch or more of dust will explode if a spark hits it. This has to do with stoichometry because the specific amount of combustion has to be found using stoichometry. If there is less then an eighth of dust is on the ground then there is not a fire hazard. But if there is more then an eighth of dust on the ground then it will be considered explosive. That is important to factories because the more dust there is the longer the reaction time and the harder it is to be put out. Obviously factories want no or little reaction time so they can put the fire out and keep everyone safe.

__Sulfur Hexafloride__

This article was interesting. I would've thought that a Sulfur Hexafloride balloon would have shrunk just like a helium balloon. It makes sense that the air would escape out leaving the sulfur hexafloride, but i didnt think it would expand until it pops. Its really obvious that if you breathe in helium or sulfur hexafloride too long you will pass out because you don't have enough oxygen, but i thought you passed out because of lack of oxygen, not build up of carbon dioxide.

Amanda, Good post. Some interesting stuff in this article.

__Motion Dectectors__

All the different motion detectors make sense. The way a wave works they can bounce off something and bounce back, just like they said how a bat detects food. I still don't really understand how inferred works. How can a wave detect heat? I already knew about how inferred could go through glass but not other objects because we learned a lot about light and waves in astronomy class. Astronomers use inferred to find stars and galaxies that cannot be seen through a normal telescope or with the naked eye, and to tell how hot or cold a star is. Also, the light of beam being broken makes sense on how it works too, because the detector will know when the light is broken.

Amanda, Awesome how you make connections to prior learning! MW