Davies,+Seth

= = =**Tattoo Ink:**= =** Tattoo ink can relate to chemistry because the ink itself is a heterogeneous mixture of different minerals to make the pigment color. Black pigments are made from carbon or iron oxides while blue pigments are made from salts or cobalt oxides and white is made from titanium dioxide, zinc oxide, or lead carbonate. I found this interesting because I never really thought about what or how the pigments for tattoos are made and then I realized that every thing is made from different types of elements. I also wonder how much time and effort it takes to create tattoo inks and pigments. Seth, Good job! Well written. 5 big stars. MW **= = = =Crude Oil:= This video is relevant to our discussions in class because we have been talking about mixtures, distillation, and other things like that. This video gives a more in depth description and real life examples of distillation and why it is important to our every day lives. It’s very interesting to me to find out how all of this information relates to me and helps in my life. One of the main things distillation is used for that affects everybody was the distillation of crude oil in which we get gas, oil, and other necessities.

Seth, Good points! 5 stars. MW

=Redefining the Kilogram:= I think that they should change the kilogram being the only actual object still being a base unit. I think that it should be the equation that they came up with because the actual matter of the kilograms will deteriorate little by little over time. Right now it is hard to be certain if something is actually a kilogram, but with the equation there will be no doubt or uncertainty. This is why they should switch the equation.

Seth, Yes once defined the standard can't be tampered with. MW

=Where Do Elements Come From?:= A supernova is something that occurs when a star explodes. When a star%Proxy-Connection: keep-alive Cache-Control: max-age=0 explodes, it releases more light than 1 billion suns. 26 different elements scatter from the explosion and eventually end up in planets. Just about every element was made in a star in the beginning of time. Eventually these elements matured and changed into other elements and were distributed among the universe. Elements are able to decay into other elements as well.

Seth, Any reaction to the article? A decent synopsis but nothing more. Connections to our classroom? 4 stars. MW

=Mole Day:= Avogadro was a scientist who was one of the founders of physical chemistry. He was a physics professor but he experimented in both physics and chemistry using mathematics to base most of his findings. He was not recognized during his lifetime because he didn’t have impressive display of experimental results to back up his hypothesis and because his work was very isolated from mainstream chemistry done in his time. I found this was very interesting.

Seth, OK. Use Safari next time. MW

=Helium balloons Sulfur hexafluoride:= I learned that breathing sulfur hexafluoride makes your voice very deep. I also learned that these two very reactive elements create a very stable bond that is almost enert as a noble gas. I did not know that the gasping reflex you feel when you hold your breath is not from lack of oxygen but actually from the build up of carbon dioxide. However I did know that when you breath in helium your voice gets very weird and high pitched. I also knew that fluorine atoms are very attracted to electrons. Finally I knew that helium balloons get small faster than regular balloons because the helium atoms are moving so fast and are so small that the can leak out of the microscopic holes in the balloon.

Seth, Good post. 5 stars! MW

=Motion Detectors:= I learned that one of the ways motion detectors work is by sending out pulses and monitoring the reflection pattern. I also learned that some even use infrared radiation and can see when warm things walk in front of it. The final thing I learned is that red light doesn't cause electrons to be ejected but a weak blue light could send them flying. I knew that one way detectors work is by having a light source aimed at a photo sensor and when that space is blocked the light goes on. I also knew that photo sensors rely on light's ability to initiate and electron current. Another thing I knew is that sensors can be made for almost every light. This relates to class because we were learning about different lights and the chemistry behind them.

Seth,

OK. 5 stars! MW