Harter,+McKenna

Lead Poisoning Lead is an element that is very toxic. The reason we here about lead poisoning in people today is because led can have a sweet kind of flavor to it but it is still toxic and should not be eaten. There is even led found in some candies from Mexico but the led is not put there intentionally. In Mexico they use chili peppers to give the candy a spicy but sweet taste and there is some led found in these peppers. This relates to class because we learned about how different types of elements can be toxic and that you should be careful.

McKenna, OK.BTW It's lead not led. 5 stars. Pr

Distillation of crude oils Fraction distillation is a more simple process than I was expecting. There are three steps in distillation. Step one is to heat the oils until the reach their boiling point. The ones with a lower boiling point collect at the top of the tube and the ones with a higher boiling pint stay towards the bottom. I found this interesting because I know that heat rises so I thought the hotter it was the closer to the top it would be. Step two in the process is to condense it and the third and final step is to collect it. This is done in fractions because not all of the oils boil at the same point. So once the first fraction is collected then they heat the remaining oils to a higher temperature and condense and collect it until all the oils are gone. This relates to our class because we talked abut distillation and we did experiment with the candies and he separations of the colors.

McKenna, Good points. The comment about heat rising is interesting. That is true but the source of the heat in distillation is at the bottom so it is hotter down there. MW

kilogram This relates to the class because we are talking about kilograms and how you measure certain things with them. I learned from this article that it is one of the most commonly used weights for measuring. This was surprising to me because i thought that pounds would be more popular. They have a certain standard for measurements and they haProxy-Connection: keep-alive Cache-Control: max-age=0 oxy-Connection: keep-alive Cache-Control: max-age=0 a model of each one that is securely protected under two glass domes with the air sucked out so it doesn't decay. These are so protected because if anything happens to them the standards are no longer the same. If these standards would change then we would have nothing to base our measurements off of. McKenna, Pounds are really only used in the US. Good thoughts. 5 stars. MW

Where do elements come from

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I think it is really amazing how all of these elements come from the stars! I knew that stars released light when they explode but i never new they released all these elements into space. I also found it very interesting how the elements were formed in the stars. It is a simpler process then i would have expected. From what i understood from the article they were formed from all the heat and pressure in the stars and they all start out as one simple atom and form with other atoms to make the elements. I didn’t really understand the r and s processes though. From what i understand neutrons are added to the nuclei but I thought that only electrons could be gained and lost?=====

McKenna, Well during rather tame chemical reactions electrons are lost and gained but some crazy nuclear stuff happens in the stars! good thoughts 5 stars. MW

__**MOLE DAY**__ I never even knew the mole existed until this year. It is actually very clever that we can measure things by quantity instead of one by one. The person who came up with the measure of the mole was named Amadeo Avogadro. His law stated that //at// a fixed temperature and pressure, equal volumes of gases contain the same number of molecules. His law, or hypothesis, wasn’t recognized until about 50 years later but is now used today.

McKenna, Pretty basic but OK. 5 stars. MW

Dust Explosion

This article really surprised me. When i think of dust I don't think of anything explosive at all. I also found it interesting that the smaller the dust particles, the more explosive they are. The explosion occurs because all of the different particles that break down on the surface react with each other even such products like sugar. This really surprised me that sugar can be part of such a big explosion. Also after the dust creates one reaction the dust goes into the air and makes more explosion so it sounds like it could be a never ending cycle. This relates to our chemistry class because we are learning that it takes just the right amount of different things for a reaction to occur just like it did here.

McKenna, Well done. The chain reaction is scary! 5 stars!MW


 * Helium Balloons Sulfur Hexaflouride**

I love to play with helium and make my voice high pitched but now i might think twice about it because i learned that you could suffocate without even knowing it. I never thought that you could suffocate without knowing it. That is a really scary thought for me. The whole process is really kind of confusing to me because it says that you don't get any oxygen but after i suck in the helium i don't still hold my breathe i breathe in and out. But when i reread the article and i think its saying that if you just breathe out and then suck the helium right away again i not giving your body the chance to breathe. I also never knew that there was a gas that could make your voice lower.

McKenna, Yes! Scary indeed. You're a little short on things you knew/learned. 4 stars. mw

__**Motion Detectors**__ This article was very interesting and kind of cool too. something that i did not know was that some motion detectors could use infrared radiation to detect humans. I did not understand this at first but i reread the article and realized that they probably used this so that it doesn't recognize other object other than humans. Something else i learned was that automatic door and radar gun could use radio waves to pick up different objects. The last thing that i did not know was the process the eye uses to view things with the photon-electron connection. This is still a little bit confusing to me though. Something that i already knew was that rattle snakes could see a humans infared body heat. Another fact mentioned in this article that i already knew was that Einstein won the Nobel Prize in 1921. I also knew that they had motion detectors that used light beams or some kind a light source to detect motion.

McKenna, I learned some of the same things you did. Good post! 5 stars! MW