Zhang,+Yueshuai

The first graphic was a bit more information and more confusing then the other graphics. The second graphic it looks much better and clean information. It tells you what is matter and identify what is break down too.The second one was my favorite till i see the third graphic. It show a little more information then the other ones. It shows what is everything breaks up too, can give a little example on what it is. For example: Pure substance goes too element and compound. and element goes to iron, compound goes to hemoglobin. Mixture goes to homogeneous then go to plasma. So overall the third graphic is my favorite.

Separation of Matter The movie about distillation was interesting for me. Like when different temperature can make different colors. This is my 3rd times doing distillation and overall is really fun to do. The question I have is what things can be filtered, and how many types of distillation is out there? I learned that It is used to separate crude oil into more fractions for specific uses such as transport, power generation and heating.

Jason, Interesting that you have had some experience with distillation. This technique is used and improve upon by frequently by chemical engineers. MW

Measurement can be important in many ways, like cooking, cloth, or in chemistry you have to measure something to make a chemical you have to get the right measurement or something bad will happened. Or in math class same thing will happen. for me, numbers are like a measure. some forms of numbers are more useful for rendering values than others; hence the importance of significant figures and scientific notation in measurements. The process of learning how to measure reveals not only a fundamental component of chemistry, but an underlying if arbitrary and man made order in the quantifiable world.

Jason, We will find there is a difference between exact values and measured values.

Redefining the kilogram After reading the article,I did get a little conProxProxy-Connection: keep-alive Cache-Control: max-age=0 Connection: keep-alive Cache-Control: max-age=0 sed about some fact but I found out some interesting fact about the international prototype. First of all is that the kilogram is the last of the SI base units that is still defined by a physical artifact rather than by an unvarying physical property of nature. But it seems thats gonna change. If they change that is not just change the definition of kilogram is much more then that. Second thing i find was pretty good was the international prototype cannot be modified after is it created. what that means is from the past year the prototype have been lost about 50 micrograms compared to its copies! Some scientist said that is not good for an SI base unit like the kilogram. To solve this problem, is to using two different equation one is Avogadro's constant and Planck"s constant. I don't know which one they will pick. But it will be a shocking news to some peoples.

Good post Jason! MW

__**Airport Security**__

I have been to an airport several times, and every country make there security system very seriously. When I was reading this article i was thinking how can those people put the bomb inside the doll? another thing I learned is that they use densities to detect the bomb.(which is a physical property) If goes up to a certain point they use X-ray to do a deeper search or if necessary they just search the bag.If there is any item like a bomb or something will show up on red color. Another thing I know before reading this article is that after the 9/11 American have been improing there security system much better then other country. Like you said Mr.William if the theft got better so is the police.

__**Mole Day!**__

//Every October 23 is a special holiday for all the scientist out in the world. Because that day is the mole day. Which know a the number 6.02x10^23. or the Avgadro's number. This number can't be counted because is much to big. If you real want to do something extreme count 1 sextallion and maybe you can get some reward. but anyways in chemistry, mole equal to the atomic mass of an atom. Consider the measurement of one mole of silicon. As silicon is a solid at room temperature, the convenient method of measurement is weighing. By consulting published tables, it can easily be found that the tatomic mass of silicon is 28.0855.[8 Multiplying by the molar mass.// M//u gives the molar mass in any desired mass units: assuming the measurement is to be made in grams,// M//u = 1 g/mol, and so the molar mass of silicon is 28.0855 g/mol. Hence, 28.0855 g of silicon is equivalent to one mole of silicon, without the Avagdro's constant ever having come into play. Another Important information is carbon is a main mole and have a atomic mass of 12.00 even.//

The probable cause is the sugar dust that would have been present in the factory. How could sugar dust cause an explosion? It is due to the size of particles and hence the surface area available to be burned.When exposed to oxygen and a source of heat it will burn. Kinetic theory states that the rate of reaction will increase as particle size decreases because there is more surface area available to react. This means that when sugar dust or flour is dispersed in the air and a source of ignition is applied, the dust will burn very rapidly, causing an explosion. Jason, Good post!! MW
 * //__Dust explosion__//**


 * __Sulfur Hexafluoride__**

Sulfur Hexafluoride is six time light then air. When you breath helium your voice goes higher. For sulfur hexafluoride your voice goes deeper. Because is lighter then air. which means the sound travels much much slower. Helium goes higher because is travels faster then higher. both can make you lightheaded from breathing them instead of air with oxygen, so use common sense. Don't keep breathing either gas. This gas is very interesting like when you buy a ballon and set it over night. The ballon will expand and grow till it explode. BUT!!! REMEMBER NOT TO BREATH THE GAS. and you will be ok.

Jason, A little late with your post. 4 stars.


 * __Motion Detectors__**

Infrared radiation exists in the electromagnetic spectrum at a wavelength that is longer than visible light. It cannot be seen but it can be detected. Objects that generate heat also generate infrared radiation and those objects include animals and the humans. When light of sufficient energy is shined on a given surface, it can cause electrons to be ejected. So basically, the sensors can be made for just about any type of light. This relate to what we are learning this unit is the electron give off different color of light when the electrons move around. Some examples of motion detector can be like motion detector door in wal-mart, hand dryer at your bathroom. So even you want to go to a friend house. come home early before they use the "Motion detecor" on ya!

Jason, Good advice! MW