Wagner,+Amy

I think the first graphic is very helpful because it shows the different branches. It also has pictures to show examples of the different steps. The second graphic shows the different branches, but has no examples. Therefore, I believe the second graphic is the least helpful because it doesn't show what the different branches mean. The third graphic is helpful, but not as good as the first because there are no examples.

I think the graphic of the distillation from a lab is interesting. I've never seen an image of how to distillate something. I've heard of distillation before, but I didn't really know much about it. I also didn't know the evaporation from the ocean was a type of distillation. I knew that the water evaporated, and the salt stayed in the ocean, but I never realized that was distillation. I think it is interesting that something that took scientists years to figure out, happens in nature all the time. We used chromatography last year in my biology class, using cabbage leaves. I think it is interesting to see all the different colors that make up the pigment. Amy, Perhaps not surprisingly a lot of human ingenuity comes from observing things that already happen in nature. Good post! MW

Measurements are very important when doing a lot of things. One time I need measurement to be exact is for costumes. I dance, and they measure us so that they know what size costumes to order. If I were measured wrong, my costume wouldn't fit. Then, it would look bad, and I might not be able to dance as well. Also, I think the world record fish story would be a time that you really need to get correct measurements. That guy's mistake cost him a lot.

The article said that the kilogram is the only form of measurement that still has a physical standard. I think that is very interesting. I didn't even know measurement had physical standards. I agree that they should change it. It is unsafe to have a physical standard. They have it well protected, but there are%Proxy-ConProxy-Connection: keep-alive Cache-Control: max-age=0 oxy-Connection: keep-alive Cache-Control: max-age=0 ction: keep-alive Cache-Control: max-age=0 Proxy-Connection: keep-alive Cache-Control: max-age=0 Proxy-Connection: keep-alive Cache-Control: max-age=0 many different things that could happen to iProxy-Connection: keep-alive Cache-Control: max-age=0 If they change the kilogram's standard to Avogadro's number, it will help students understand Avogadro's number a little bit more, and it makes the kilogram more secure.

I think those technologies are very interesting. It is good that there are so many different ways to detect any harmful objects. I've been to airports, and the inspection is rather quick. It is surprising that they do so much, so fast. I think IMS is very interesting, also. I never thought about most explosives having different densities then typical items in a suitcase. That is a smart way to detect if there is anything dangerous in a bag. It is cool that x-rays can determine density.

One thing I learned is that mole day was started by a teacher in Wisconsin. She wanted to make her students more excited about chemistry. I learned that the mole is one of the basic measuring units in chemistry. I also learned that mole day is celebrated around the world. The mole is the mass (in grams), which is equal to the atomic mass of that molecule. I also learned that Avogrado didn't receive credit for his discovery until after his death. I learned that there is two different mole pledges, in which you should face the earth while saying them, out of respect for the mole. People create many different things, with mole day, to get students excited about chemistry. There are theme songs, projects, jokes, and more. I like that mole day is a combination of learning about the mole and other aspects of chemistry, but also having fun playing games and telling jokes.

That is very interesting. I would definitely not think of sugar being explosive. I think the factory should just keep it clean. If they had a cleaning crew come and get rid of the dust, they wouldn't have to worry about it. I would like to now what they do to help the situation. The article talked about two companies. I've never heard of CSB or OSHA. I don't know how you would prevent this type of accident from reoccurring. I don't fully understand the change in the stoichiometry from when it is on the ground to when it is in the air. However, maybe the companies could use this to help prevent these explosions from happening.

Amy, The airborne dust literally mixes with air to create a stoichiometric ratio of oxygen and fuel that is explosive. MW

I think that is the cool that the balloon will actually get larger over time. The air flows in more quickly than the Sulfur Hexafluoride flows out, so the balloon gets bigger. I didn't know that you feel suffocated because you don't get rid of the carbon dioxide. I always thought it was triggered when you don't have enough oxygen. I also think it is very interesting that two compounds, which are both so dangerous, create something to stable. It is odd that the gas can be dangerous, because it has impurities, not that the gas is dangerous itself.

Amy, Looks good! MW

The article on motion detectors was very fascinating. I did not know that there were different types of motion detectors. I knew that bats could bounce sound waves off of insects to find food. However, I did not know that this same idea could be applied to waves of light as well. Also, I think the information in the article about opaque and translucent objects. Glass allows visible light to pass through very easily, however, it blocks the IR type of infrared light. Also, polyethylene, what milk jugs are made out of, does not let a lot of visible light to pass through. Polyethylene allows the IR waves to pass through easily. The article also said that the IR waves are very similar to visible light waves.

Amy, Good observations! MW