Ilko,+Jessica

=Tattoo Ink= I read the article about tattoo ink. Tattoos relate to chemistry because there are a lot of chemicals and minerals that are in tattoos. Chemistry is needed in tattoos for finding all of the chemicals that can be used and cannot be used. When reading about all of the minerals that have to go into your body when getting a tattoo, I realized that I really do not want a tattoo. I do not want to have all of those different kinds of minerals in my body if they were not there originally.

Jessica, Looks good. MW

DISTILLATION

I learned that distilling crude oil is a long process. You have to boil the crude oil at a high temperature. At some point the different chemicals go through a glass spiral, where they start to cool down. The higher the chemicals get, the more cooled down they will be. Hydro Carbons condense to liquids in the glass spirals. The different kind of Hydro Carbons will turn to liquid at different temperatures.

Jessica, OK. MW


 * Redefining the Kilogram**

We have been learning the SI units and this article brought up some more units that we have not really gone over yet. Time, Kelvin, Kilograms, Meter, Ampere, Mole, and Candela were the seven units in the SI. I thought it was interesting to see the different units that are used to measure different things. There are two different kinds of constants: Planck’s constant and Avogrado’s constant. Planck’s constant describes the quantization of energy in matter and is related to mass. Avogrado’s constant is the number of entities in a mole of any material.

Jessica, Yes we spend a lot of time with the Avogadro one! MW


 * Where Do Elements Come From?

Scientists believe that elements formed when there was a star explosion. When the proton and electron from Hydrogen separates, then Proxy-Connection: keep-alive Cache-Control: max-age=0 e star squeezes together protons. Sometimes a proton and electron will form together and create a neutron. Depending on how many neutrons, protons, and electrons there are, a different element is formed. Stars are able to%Proxy-Connection: keep-alive Cache-Control: max-age=0 Proxy-Connection: keep-alive Cache-Control: max-age=0 make elements that are heavier than iron, as well. When and iron nucleus captures nuetrons, a nuclei is made. There can be different versions of an element in the nuclei, which are called isoptopes. This process is called the "s" process and is very slow. When a star goes into a supernova the light shoots off an extremely high number of neutrons. The neutrons form with nuclei. This is the "r" process. Scientists believe that the elements have been around for billions of years and then released when there is a supernova.

Jessica, Looks good! 5 big stars. MW **

**MOLE DAY!**

I learned that Avogadro's Law states that at a fixed pressure and temperature, equal volumes of gases have the same amount of molecules. Avogadro was not honored during his living. He never came up with a good hypothesis and enough information to show that his findings were true. It was not until many years after his death when someone else helped with the findings for 6.022 x 10^23. I also learned the reasoning behind why the abbreviation for mole is mol. M is already used for meters, mo is used for months, ml is used for milliliters. I think they could have abbreviated mole to m.e. though.

Jessica, Good post! Interesting suggestion on the abbreviation. 5 stars. MW


 * Dust Explosion

I thought it was interesting that sugar can actually be used as an explosive. A sugar plant can create dust from the sugar in the plants. It seemed very dangerous to me that there was a sugar plant that had a half an inch of dust coating their floor. If even a small spark is ignited in that factory, the whole place will explode. What I do not understand is why the factories do not have people cleaning the place regularly. It would seem more safe if there was less dust in the air and coating the floors and machines. I would think that with all of the deaths and injuries that have occurred in the past twenty-five years, factories would try to clean out the dust more often. I am glad that Georgia has reopened debates on how to reduce the explosions from combustible dust. Stoicheometry is used in the dust exlosion. If you were to have dust and oxygen, and you heated it, it would create fire (an explosion).

Jess, I guess people ignored the dust since it's probably expensive to clean it up. I wonder about people breathing that dust! 5 stars!! MW **


 * Helium Balloons**

I knew that all objects contained mass and that gas molecules exert pressure in all directions because they hit the surrounding surfaces. I also new that the metric unit of force was newtons (N). I did not know, or must have forgotten, that there was a greater force on the opposite direction so that the object would stay where it was. I was surprised to learn that we weigh more than we think because of the buoyant force. I also learned that when a person takes in helium, they are not taking in oxygen. I did not know that people could actually be loosing oxygen when they take in helium.

Jess, Hmm... I'm not sure on your last statement. If you are not breathing O2 but He instead than you would deprive your body of oxygen. MW

Oh. I kind of figured that if they were taking in He so much, they could not breathe in O2 at the same time. Therefore, they are not taking in O2. I do not know why I said losing oxygen. Sorry!


 * Motion Detectors**

I knew that there was such a thing as a motion detector, but I never understood how it could detect body movement. I have a motion detector outside of my house and I remember asking myself how in the world they worked. Now I know that there are three different kinds: detectors where a beam of light can be broken by an object, when a signal bounces off an object, and when it detects the infrared light given off by warm blooded beings. I thought it was interesting that there was such a motion detector that could detect when there was a change in temperature by a couple of degrees. I also learned that when the light of sufficient energy is shined on a surface, electrons can be ejected. I remember hearing that in class on Friday. It was also interesting that a high-intensity, low-frequency beam of light would not cause electrons to be ejected, but a low-intensity, high-frequency beam could.

Jess, I suspect that there are motion detectors for all sorts of applications. Good post! 5 stars. MW