Than,+Veasna

This article describes about various tattoo inks that can be used rather then just ordinary ink. Modern chemistry has found a variety of colors that can be used as well as glow-in-the dark ink. Glow-in-the dark are UV activated inks, they can be cancerous because the ink contains phosphorus. Other types of tattoos are temporary tattoos and removable tattoos. Temporary tattoos are pretty much like body paint while removable tattoos use pigments that can be absorbed by the body. Traditional tattoo ink can take months of laser treatments to remove. In conclusion, Chemistry plays an important role in tattoo ink.

Veasna, Good points! 5 stars. MW

I learned that crude oil is actually useless as a mixture. It has to undergo distillation and be separated into separate components for it to be actually worth something. In distillation, the crude oil is separated into useful fractions, which can be used for different reasons. For example, gasoline can be separated from crude oil. Gasoline is important because it can be used as fuel for cars. Chemistry plays an important role in the economy.

Veasna, Looks good. MW

Apparently, the international standard for the kilogram, which is a physical artifact that measures exactly 1 kilogram, has lost approximately 50 micrograms of mass overtime compared to the other copies that were made of the exact same object. This caused uncertainty between the various BIPM committees, the International Bureau of Weights and Measures, because they were recommending that the kilogram be redefined. That means that they would have to change the definition of a kilogram completely. I think that it is possible, but it will be difficult, so they should come up with a different approach.

Veasna, Apparently this is not an easy thing to quantify. 5 stars. MW

//Where do Elements come from?// Our everyday essential elements like oxygen and carbon had to come from somewhere. This article explained it to me with very specific details, claiming that I am made out of the remnants of stellar explosions. During the stellar explosion, the various elements are released and basically stagnates in deep space. These stagnant elements form those cool looking nebulae. Inside these nebulae, a new star forms, then planets, and eventually us. When I was reading this article, I was thinking about the vastness of space and the probability of this occurring. It really makes you feel like you’re not alone in this universe. Nevertheless, chemistry is a never ending search for knowledge.

Veasna, Good points! 5 stars. MW

//Mole Day// A mole is a unit of measurement that is used to find the amount of atoms in a molecule, a compound, or an object. The protons, neutrons, and electrons can also be found using mole. Amadeo Avogadro proposed the mole in 1811 but it was not really accepted until 1860, nearly 50 years later. The mole consists of 6.02x10 23  and was nicknamed Avogadro’s number in honor of Amadeo Avogadro.

Veasna, OK. MW

//Dust Explosion// The article speaks to us about a tragic incident in which several people were killed due to a sudden explosion. The cause of the sudden explosion was unknown for some time, but it was eventually discovered by using stoichiometry. The building that housed the sugar exploded because of the small dust particles that combusted and caused a series of explosions. The reason that the small sugar particles combusted was because they were very tiny and required little energy to begin combustion. The outcome was very tragic and caused many deaths and serious injuries. Maybe learning and understanding Chemistry can help prevent future incidents like this.

Veasna, Sadly, people know about the risks but in this case did nothing to prevent the tragedy. 5 stars! MW

//Sulfur Hexafluoride// I knew three pieces of information prior to reading this interesting article, but I also learned three new pieces of information after reading and contemplating about the article. First, I knew that sulfur hexafluoride can be used to make your voice deeper because it sits in your lungs due to its density unlike helium which rises to the top because it is not as dense. Second, I knew that helium balloons will deflate over time because the element will leak out depending on the situation. Last, I knew that if you inhale too much helium, also known as overdosing, you could possibly pass out because of the lack of oxygen. After reading this intuitive article, I learned various new pieces of information. First, I learned that the human brain does not tell the body to respire because of the lack of oxygen when one holds their breath, but because the body contains too much carbon dioxide that needs to be exhaled. Second, I learned the composition of sulfur hexafluoride and the reason why it is a non-polar molecule. Last, I learned that sulfur hexafluoride does not necessarily deflate over time unlike helium balloons, but it increases in size over time because the molecules inside the balloon leak out slower then the molecules outside the balloon leak in.

Veasna, Good observations! I especially liked your comment on the non-polar nature of SF6. 5 big helios stars! MW

//Motion Detectors// This article is very relative and interesting at the same time. I recognized three attributes that I knew prior to reading this article. First, I knew that motion detectors use a specific light source and monitor the changes that occurred. For example, banks use infrared laser beams and if something passes it, the detector will detect it. Second, I knew that some devices send out sound waves to a particular distance, then calculate the time it takes to receive the sound wave to identify where that particular object is located. I knew this because of sonar and radar. Third, I knew that some devices use heat to detect objects because all humans give off infrared radiation. Three things I learned while reading this article is the process of vision which is still fairly complicated to me, the ability of light to initiate electrical currents, and that the intensity of light only depends on how much photons are impacted rather then how much energy each photon possesses.

Veasna, Looks good! Well done. 5 stars. MW