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Search results 10521 - 10530 of 12257 matching essays
- 10521: The Giraffe
- The Giraffe My science project is on Giraffes. The Giraffe is the tallest mammal in the world. Giraffes have very long necks with a short, upstanding mane, high shoulders which slope steeply, and long legs that are nearly equal in length. The male weight can range to 2420-4250, and the female can range to 1540-2600. The Giraffes can stand up to ...
- 10522: The Lowell Observatory
- ... to be moved back to Mars Hill in Flagstaff, Arizona. Because the sight was a better place to see the sky then it was while in Mexico City. The site in Mexico City was not high enough; therefore Dr. Percival was forced to move back and tear done his dome that was built in Mexico. He had tried many locations in North America for which was the best location for the ...
- 10523: Oxygen
- ... 2 State of matter - gas Non-metal Discovered in 1774 by Joseph Priestly Boils at -183 °C, melts at -218.4 °C Notes: Oxygen is commercially prepared by the fractional distillation of liquid air. At high temperatures oxygen combines with most elements and many compounds, esspecially those containing carbon and hydrogen, to form oxides of all elements. Oxygen is necessary to sustain human life. A substance combining with oxygen is always ...
- 10524: Tin
- ... has been around for many years. Proof is in the fact that tin is mentioned in the old testament of the bible. Tin had a great effect on the world because of its low price, high electric conductivity, and because tin protects against rust and weak acids in food if the can is made out of tin instead of aluminum. Some common compounds of tin are organtin a combination of carbon ...
- 10525: The History of Carbon
- ... Kinoshita 119-127). Amorphous carbon is a deep black powder that occurs in nature as a component of coal. It may be obtained artificially from almost any organic substance by heating the substance to very high temperatures without air. Using this method, coke is produced from coal, and charcoal is produced from wood. Amorphous carbon is the most reactive form of carbon. Because amorphous carbon burns easily in air, it is ...
- 10526: Thallium
- ... in Sweden and the Former Yugoslav Republic of Macedonia. It is also extracted from the mud produced in lead chambers that are used in the manufacturing of sulfuric acid. Thallium is also used in Thallium high-Tc superconductors. Just recently, Thallium is beginning to be used to visualize the reduced flow of blood into the heart muscle. It is injected into the veins and then a camera records the thallium penetration ...
- 10527: Technetium
- ... the reduction of ammonium pertechnetate with hydrogen. Techne tium is a silvery-gray metal that tarnishes slowly in moist air. Until 1960, techne tium was available only in small amounts and the price was as high as $2800/g. It is now commercially available to holders of O.R.N.L. permits at a price of $60/g. The chemistry of technetium is said to be similar to that of rhenium ...
- 10528: Quarks
- ... principal. Second, quarks appear to not be able to be separated from the particles they make up. Although the force holding the quarks together is strong it is improbable that it could withstand bombardment from high energy and neutrinions in a particle accelorator(1985 Quarks). Quantum chromodynamics(QCD) ascribes colours red, green, and blue to quarks and minus-red, minus-green, and minus-blue to antiquarks. Combinations of quarks must contain ...
- 10529: Plutonium
- ... artificially in a lab. The official chemical symbol for plutonium is Pu, coming from its first and third letters. Its atomic number is ninety-four. Plutonium is able to maintain its solid state until very high temperatures, melting at six hundred and forty degrees Celsius, and boiling at three thousand four hundred and sixty degrees. The density of Plutonium, at twenty degrees centigrade, is 19.86 grams per cubic centimeter. Plutonium ...
- 10530: Ozone
- ... labored breathing, sore throat, nausea, rapid breathing, and eye and nose irritation. The symptoms occur when the levels of ozone are only slightly higher than the legal standard. Living in San Diego during my elementary school year, I personally felt the effects of ozone; the tightness of the chest, wheezing, and labored breathing on certain hot, humid days. Days would be labeled "smog days", and children wouldn't be able to ...
Search results 10521 - 10530 of 12257 matching essays
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