absolute zero (-459 degrees Fahrenheit‚ 0 degrees Kelvin‚ -273 degrees Celsius) to liquid nitrogen temperatures (-321 F‚ 77 K‚ -196 C)‚ they have no electrical resistance. The temperature at which electrical resistance is zero is called the critical temperature (Tc) and varies with the individual material. For practical purposes‚ critical temperatures are achieved by cooling materials with either liquid helium or liquid nitrogen. The following table shows the critical temperatures of various superconductors:
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prevent any disease. I believe that the claims made by DVX Pro Liquid are too good to be true‚ and it is truly not that effective. I believe that products similar to this have just taken advantage of a sudden increase in popularity and demand for deer antler spray and are covered by the Dietary Supplement Health and Education Act of 1994 to sell their product without backing up their claim. In order to prove my hypothesis‚ DVX Pro Liquid would need to be
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Corporate Finance Case Discussion : ‘Diamond Chemicals Plc (A)’ 1. Purpose: This case presents the capital investment decision under consideration by executives of a large chemicals firm in January 2001. This involves a go/no-go project evaluation regarding improvements to a polypropylene production plant. A critical assessment of a capital investment evaluation system is the focus of this case. The case also enables discussion on conflicts of interest and other ethical dilemmas that may arise
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Chemical Bonding Chemical compounds are formed by the joining of two or more atoms. A stable compound occurs when the total energy of the combination has lower energy than the separated atoms. The bound state implies a net attractive force between the atoms ... a chemical bond. The two extreme cases of chemical bonds are: Covalent bond: bond in which one or more pairs of electrons are shared by two atoms. Ionic bond: bond in which one or more electrons from one atom are removed and attached to
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Chemical Weapons Chemical weapons use the toxic properties of chemical substances rather than their explosive properties to produce physical or physiological effects on an enemy. Although instances of what might be styled as chemical weapons date to antiquity‚ much of the lore of chemical weapons as viewed today has its origins in World War I. During that conflict "gas" (actually an aerosol or vapor) was used effectively on numerous occasions by both sides to alter the outcome of battles. A significant
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Liquid Gold “The sounds of gunshots rang out throughout the town‚ piercing the veil of quiet like a hot knife through butter. Bushranger PJ Sebastian winced at the sound of every shot‚ keeping his fingers crossed and begging that none of the shots hit their mark. Desperately‚ he limped towards the tree line‚ as if he had any other choice in the matter‚ begging that the tall‚ menacing oak and gum trees could protect him from his assailant. Blood was pouring out of his thigh. He clutched at the wound
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CHEMICALS IN COSMETICS (OVERVIEW) FACTSHEET A cosmetic is a substance or preparation that is designed to be used on any external part of the human body – including in the mouth – to change the odours of the body‚ to change its appearance‚ cleanse it‚ keep it in good condition‚ perfume it or protect it. Cosmetics include soap‚ shampoo‚ moisturiser‚ hair dye‚ perfume‚ lipstick‚ mascara and many other products‚ but do not include products regulated as therapeutic goods (medicines). Cosmetics are made
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Chemical Reactions Chemical Change • reorganization • original substances form new substances with different formulas • may or may not involve a change of state • symbols used to describe chemical reaction are known as a chemical equation • Chemical equations do not have equal signs (=) they have an arrow Chemical Equations • Must follow the Law of Conservation of Matter • atoms can neither be created or destroyed during a chemical reaction • What
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changes are used to describe matter. A property is a trait of matter‚ when that sample of matter is in a fixed state. There are two different types of properties: physical properties and chemical properties. A change is something that alters the properties of a substance. There are two types of changes: chemical changes and physical changes. A physical property is a property that can be observed without changing the makeup (or composition) of a substance. Some examples of a physical properties
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Chemical Formula Principles Chemical Formula is a system of chemical notation that was invented in 181 by John Jakob Berzelius. The system is based on the law of definite proportions”‚ states that all samples of a given chemical compound have the same elemental composition. It is also a way of expressing information about the proportions of atoms that constitute a particular chemical compound‚ using a single line of chemical element symbols‚ numbers‚ and sometimes also other symbols‚ such as
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