Nemtuda,+Morgan

I prefer the second graphic which is the simple "tree" graph that clearly shows in which direction you should look while trying to classify a certain substance. It is not too complicated and just a quick reminder and refresher so you can decipher a mixture, element, compound, etc. It's pretty easy to understand and doesn't overwhelm me with pictures, arrows, and a lot of words.

Jake- I think that the second "tree" graph doesnt actually show the compounds and picture of what is going on when it states the differences in the classifications. The first graph does and thats why I believe that it is much easier to comprehend at the beginning level that we are at.

Morgan, This is OK but you should post your responses to other people on the discussion tab of their page. MW

August 28th, 2009.

I learned a lot of things I didn't know about separating solutions through filtration, distillation, and chromatography. Basically I knew very little about these procedures so things finding out like how each is performed and the materials needed was new to me. I also didn't realize that a tea bag is an example of filtration. I found distillation to be rather interesting because of how it uses high and low boiling points to separate the solution. I think almost all of this information is relevant to our class because of the experiments we are doing. We already used chromatography with the skittles and m&m's. Filtration is used in our every day life like coffee makers and the water cycle. Distillation is more for oil and other substances but we might be doing experiments later on with it.

September 1st, 2009. Why is measurement important to you?

Well, I am not a very good baker or cook. The most I know how to make is pancakes, mac & cheese, and brownies. When I make these items I have to look off of the directions and re-read them a lot. Usually I make sure I have the exact measurements because I know I'll screw it up if I don't. If I put in too much water to the pancake mix, then I have to add more mix to even it out, and if it gets to thick then I have to add more water. It's better just to take the time tProxy-Connection: keep-alive Cache-Control: max-age=0 oxy-Connection: keep-alive Cache-Control: max-age=0 20measure the ingredients and make tasty pancaProxy-Connection: keep-alive Cache-Control: max-age=0 s the first try!

Morgan, Most chefs do some form of measuring. I think you are wise! MW

9.9.09 Redefining the Kilogram

I found it very interesting that a physical artifact was still used as the prototype of the Kilogram. To me that sounds a lot like olden times. With the technology advances and scientific discoveries we have these days I would have never even guessed a golf ball sized hunk of metal is what the world uses to define the weight of a Kilogram. It sounded like there was a discovery that might make things a little easier and a little more accurate. By using natural things such as light intensity and what not to determine the weight it would prevent the fact that the prototype is losing more and more weight over time.

Morgan, Looks good! MW

9.17.09 Airline Security

This article was very interesting to me. As I was reading it I was realizing how much science is used in the airline security. I go through a major international airport at least twice a year because my family likes to travel and I never really thought about the security. I know that the line is always long and that they check for explosives and other things such as drugs or weapons. This article explained a lot of different steps the officers have to go through just to make sure we are safe to go on our trip. But really, with all the science involved, the officers should be scientists!

10.7.09
 * National Mole Day**

Mole day is celebrated from 6:02 am - 6:02 pm on October 23rd each year. This corresponds with Avogadro's number. The mass of one mole of each molecule on the periodic chart is equivalent to the atomic mass of that pure substance. For example, carbon's atomic mass is 12.011 grams, therefor one mole of carbon weighs 12.011 grams. Scientists use weighing instead of counting to determine the mole. National Mole Day was created to get students more excited about chemistry. The National Mole Day Foundation (NMDF) was formed on May 15th, 1991. The group is self funded and holds the annual competitions such as 'Mole of the Year' award. Turns out Mole Day became a pretty big deal in the science classrooms across America.

11.3.09 Dust Explosion & Stoichiometry I think that this article ties in with Stoichiometry because of the ratios. The amount of dust particles really do matter because the smallest amount could combust. It is important factories take action and regulate these dust particles. Even though a little dust may seem harmless, just the right amount of electric shock and chemicals in the dust can set the whole factory in flames. Scary but real!

December 3rd, 2009 Sulfur Hexaflouride This article was pretty interesting. I think that breathing in this sulfur hexaflouride gas is dangerous when by yourself. It is pretty neat that your brain is tricked into thinking you don't need oxygen but it is also potentially dangerous. Helium and sulfur hexaflouride seem to have similar characteristics though. I wonder why helium makes your voice higher but sulfur hexaflouride makes your voice lower.

I never really thought that motion detectors had anything to do with the electromagnetic spectrum. It is neat that it can be used to do so many things such as the automatic door at your local grocery store. Although, I really doubt my parents could catch me with a motion detecting light after curfew. This was a neat article though. =)

Morgan, A little short. Funny though. 4 stars. MW