Hofecker,+Abigail

MEASUREMENT: Measurement is very important to me in many parts of my life. One example is in sculpture class. We are making shapes out of cardboard that have to fit together exactly. The pieces of cardboard have to be measure precisly or they will not fit together properly. I measured a shape incorrectly and it threw off the entire thing. I was angry and had to start over on that shape completly. It is very frustraing and could be avoided by measuring bettter. You also have to be sure you are measuring in the correct units. If you accidently mess up CM and IN, it will also throw off your entire thing. Overall, all of this frustration could be avoided by measureing presicly. Abby, I feel your pain. We have all messed up like that. The carpenter's creed is "measure twice, cut once." Good! MW

SEPARATION OF MATTER: Something I didn't know was how the distillation process works. It involves heating up a mixture and eding up with a separated product. In distillation, when it is a certain temperature, all the things with that boiling point vaporize. One of the things that I found interesting was how distillation was used to separate the different parts of crude oil. I think that the video did a good job of explaining the preocess. Overall, there were many interesting things I learned and did not know about the separation of matter.

Abby, This post is good but you were a little late posting it. MW

GRAPHICS: There are both similarities and differences in the graphics. For example, the first graphic shows a picture of what the matter may look like, while neither of the other graphics do. The last graphic gives examples of things that fall into each category. The last two graphics show how the different categories branch off of each other. The first picture shows how to classify the different types. I think the most helpful graphic is either the third one because if gives examples or the first because it shows pictures.

KILOGRAM: The one thing in this article that I found to be tProxy-Connection: keep-alive Cache-Control: max-age=0 oxy-Connection: keep-alive Cache-Control: max-age=0 most interesting was how the kilogram is Proxy-Connection: keep-alive Cache-Control: max-age=0 e only meaurment that still uses an artifact to represent it's weight. I also see how there would be troubles and difficulties with changing this. Another thing that I found out in the article was that there are seven base units in the SI, and they are kilogram, meter, second, ampere, kelvin, mole, and candela. I can also see why the kilogram has to be protected so much, If it were to be stolen/lost/etc. all the kilogram measurments would be off. Overall, I learned a lot about base measurments and the kilogram from this article.

AIRPLANE SECURITY: This article was basically about how airport security can detect explosives and other materials in bags. The bags go through a scanner, which uses probes to find the density of items in the bag. That is then compared to known densitys of explosives and such to see if it is the same. during this process, they try to detect a threat quickly and as soon as possible. The may also swab the luggage or manually search the bag if they need a better view of something suspicious. Also, if an explosive or something matching one of the pre calculated densitys is detcted in the bag under the scanner, it will appear red.

MOLE DAY: Mole Day is celebrated on October 23, from 6:02 am to 6:02 pm because Avagadro's number is 6.02x10^23. This number is a basic unit to measure with in chemistry. Mole day helps keep an interest in chemistry while doing fun activities involving the mole. One mole is equal to an element's atomic mass. Ex.: Oxygen has an atomic mass of about 16.00 therefore one mole on oxygen weighs about 16.00 grams. Amadeo Avagadro is crediting with discovering this. Every year, a theme is made for mole day.

DUST EXPLOSIONS AND STOICHIOMETRY: The smaller particles are the ones that are to be considered explosive. They only need a small spark for them to explode. When the particles of sugar break down into smaller particles, then those are the ones that are explosive. I think this is an example of stoichiometry because certain amounts of the explosive particles need certain amounts of the air to react with. If there isn't enough air to react with, they probably will not. This is a problem that seems very easy to prevent. However, it seems like not many people are aware this can happen, so they don't take steps to prevent it.

Abbey, You really seem to understand the essence of stoichiometry and this issue. MW

SULFUR HEXAFLOURIDE: I found it interesting that two very reactive elements could combine into something that is fairly harmless to breathe in when there are no impurities in the tank that it is stored in the the elements may have reacted with. I also found it interesting that the buildup on CO2 in our body is what "tells" us to exhale. When someone breathes in helium or even sulfur hexaflouride they don't get that signal to exhale the CO2 and are, as the article said, basically suffocating. One more interesting piece on information that I learned from this article was that a balloon from sulfur hexaflouride will not shrink or stay the same size, but over time will actually grow larger!

Abby, Good post. You captured the essence of this article in a well written paragraph. MW

MOTION DETECTORS: I was surprised to find out how motion detectors really work and how much they have to do with what we are learning in class now. The motion detectors work when a light initiates an electric current. This is the photoelectric effect and in simpler terms, means when light with enough energy is shined on something, it causes electrons to be ejected or expelled. The particles of light only depended on the frequency the came in, not the energy the had. Other types of motion detectors I read about were one that requires a light source and censor, one using echo and sound to detect motion, and ones that detect infrared radiation.

Well done Abbey! MW