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Chemical and physical properties of aluminum flashcard
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1. Aluminum: Aluminum is a silvery-white metal which is a chemical element of boron group represented by symbol Al and have atomic number 13. It has soft ductile nature. Aluminum is abundantly available (third most abundant element). It makes about 8% of the total mass of earth crust. It is very chemically reactive and present with the combination of 270 different minerals. Previously it was produced in 1924 for the first time. Bauxite is the chief ore of aluminum. Aluminum is famous because of its low density and its ability to resist corrosion by using the phenomena of passivation. Alumina is an integral part of an aerospace industry, electrical engineering, and transportation with its other alloys. It is also used in building and window …show more content…
High malleability and corrosion resistance and traditional acoustic characteristics of brass have made its use as a metal of choice in the construction of musical instruments, because acoustic resonators possess long, narrow tubing in the form of folds and coils for compactness. Gold and silver with its alloys are also used for the same purpose but brass is the most economical metal of choice. Musical instruments which are also known as brass instruments include tuba, trombone, trumpet, euphonium, French horn, baritone horn and …show more content…
Synthetic plastics are used widely in food packaging, detergents, cosmetics, pharmaceuticals and other chemicals’ packaging. Almost 30% of the synthetic plastics are used for packaging applications in the world and this rate is expanding at 12% per annum. They have replaced traditionally used papers and cellulose products for packaging purposes because of owing better physical and chemical properties. Polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyurethane, poly(ethylene terephthalate), poly(butylene terephthalate) and nylon are most commonly used plastics. Plastics possess not only suitable thermal and mechanical properties but also better stability and durability. Plastics have attractive more public and media attention because of its durability and visibility in a litter as compared to other solid components. In 1993, total world consumption of this material was 107 million tons and it reached to 146 million tons in
Aluminum is the third most abundant element and most abundant metal in the Earth’s crust. Aluminum is never found in the free element state in nature. It
Piringer, O., & Baner, A. (2008). Plastic packaging: interactions with good and pharmaceuticals. New York: Wiley-VCH.
The brass section is a collective term for the trombone and trumpet sections. Quite often these sections play the same phrases and rhythms, for a powerful, brassy sound. These instruments can also make use of sound-changing mutes, which are widely used in jazz.
Today’s unprecedented technological advancement has accelerated the pace at which everyone is living. Time becomes a limited resource that every person tries to make the most use of. Therefore, convenience is the major quality highly valued in today’s world. Plastics strongly demonstrate such quality; plastics are light-weighted and disposable. Consequently, the use of plastics is prevalent, from simple objects, such as bags and bottles, to more complex components, such as computer boards. The benefits of plastics are countless; for instance, plastics are disposable and waterproof. However, many critics have raised questions regarding the threats posed by phenomenal plastics. What are the downsides of plastics? How should we cope with the plastic pollution around the globe? Susan Beraza has the answers to
Aluminum is a lightweight, silvery metal. The atomic weight of aluminum is 26.9815; the element melts at 660° C (1220° F), boils at 2467° C (4473° F), and has a specific gravity of 2.7. Aluminum is a strongly electropositive metal and extremely reactive. In contact with air, aluminum rapidly becomes covered with a tough, transparent layer of aluminum oxide that resists further corrosive action. For this reason, materials made of aluminum do not tarnish or rust. The metal reduces many other metallic compounds to their base metals. For example, when thermite (a mixture of powdered iron oxide and aluminum) is heated, the aluminum rapidly removes the oxygen from the iron; the heat of the reaction is sufficient to melt the iron. This phenomenon is used in the thermite process for welding iron .
Over the course of the past 60 years, an increasing amount of the current population is using plastic and reusable products to try and reduce the amount of waste that is being thrown away. Bisphenol A (BPA) is used to manufacture polycarbonate #7 plastic which have help strengthen plastic bottles, food containers and epoxy resins (University of Minnesota, 2008). BPA is used in a range of products from every day plastic beverage containers and plastic dinnerware, to compact disks, impact-resistant safety equipment, automobile parts, and toys (Centers for Disease Control and Prevention, 2013). The CDC (2013) also states that BPA epoxy resins are used in the protective linings of food cans, in dental sealants, and in other products (Centers for Disease Control and Prevention, 2013).
Stainless steel is a type of alloy that has a very strong lattice structure (an arrangement/ shape of the crystals or other objects) which in some case can be more beneficial than others depending on the type of application it may be used for. In many cases this structure will make the material more suited to being used in engineering applications such as tools for instance a hammer (stainless steel alloys) , also they can be used for gears, engines, electrical motors and hydraulic systems because the structure makes the material so strong. So when the arrangement of the structure is as above it makes the overall material even stronger which makes it a good for all the applications stated above. I believe its strength and durability are its main properties as these are commonly needed in the engineering industry, although it is also very well known to be used for its corrosion resistance as it is resistant to many types of corrosion. It is used for these properties because the components such as gears need to be strong in order to keep transferring and altering the rotary motion and torque exhibited in the machine that it may be used in, durable to withstand any loads or pressure put onto it and also corrosion resistance to give the components a bigger life span and increase its rate of work throughout its required use.
Brass itself is a metal alloy combination of copper and zinc. Yellow brass, which is 70 percent copper and 30 percent zinc, is the most common metal used to manufacture trombones and gives the instrument its characteristic warm metallic color, but other types of brass such as rose brass and red brass, which each use higher levels of copper than zinc, can also be used.
Copper and copper alloys, such as bronze, brass, leaded brass are commonly used in friction parts of machines, as bearing liners, bushings, and water with gas fittings. Properties such as high strength and ductility, fatigue strength, wear resistance and machinability are necessary for these materials. Obtaining such properties is possible by creating submicrocrystalline and nanocrystalline structures in the materials [1]. The most common copper alloys are the brasses for which zinc, as a substitutional impurity, is the superior alloying element. Some of the common brasses are yellow, naval, and cartridge brass and gilding metal. Some of the common uses for brass alloys include jewelry, cartridge parts, automotive radiators, musical instruments,
Aluminum is one of a number of soft metals that scientists call "poor" metals. It can be shaped and twisted into any form. It can be rolled into thick plates for armored tanks or into thin foil for chewing gum wrappers. It may be drawn into a wire or made into cans. Aluminum is a generally popular metal because it does not rust and it resists wear from weather and chemicals. (Bowman, 391) Aluminum is an element. Its atomic number is thirteen and its atomic weight is usually twenty-seven. Pure aluminum melts at 660.2ºC and boils at 2500ºC. Its density is 2.7 grams per cube centimeter. Aluminum is never found uncombined in nature. (Bowman, 391) Aluminum is a very useful metal that is light, easy to shape and can be strong. This makes aluminum one of the most used metals in the world, right behind iron and steel. (Geary, 185) In its pure state, aluminum is quite weak compared to the other metals. However, its strength can be greatly increased by adding small amounts of alloying elements, heat-treating, or cold working. Only a small percentage of aluminum is used in its pure form. It is made into such items as electrical conductors, jewelry, and decorative trim for alliances and cars. A combination of the three techniques has produced aluminum alloys that, pound for pound, are stronger than structural steel. Some common metals used in alloys for aluminum are copper, magnesium and zinc.(Walker, 31) The added elements give the aluminum strength and other properties. (Newmark, 41) Aluminum is one of the lightest metals. It weighs about 168.5 pounds per cubic foot, about a third as much as steel which weighs 487 pounds per cubic foot. (Neely, 214) As a result, aluminum has replaced steel for many uses. For example, some ...
I was able to teach trombone to Hector. During this lesson, I taught him how to buzz and the first five notes of the Bb concert scale. We went through a few of the section in the Brass Method book. We got this goal accomplish within our lesson.
Aluminum is number thirteen on the periodic table and it’s atomic weight is twenty seven. The melting point of aluminum is 660.2 degrees Celsius. The density of Aluminum is 2.7 grams per cubic centimeter. In nature, aluminum cannot be found uncombined.
There are many different types of alloys; some are so common that they carry on a life beyond their metal bases. For example, 65-90% of copper mixed with 10-35% of zinc create the well known alloy brass, which provides increased resistance to corrosion in things like instruments and
We go on a day to day basis trying to make sound choices, but we all intentionally fool ourselves from time to time by engaging in wishful thinking. Despite how illogical this pattern of reasoning is, our human nature leads us to it and repeats this action even though we usually see its failure time after time. Although most wishful thinking is something we should attempt to avoid, there are also some types of wishful thinking that we can benefit from. According to Howard Kahane and Nancy Cavender, authors of Logic and Contemporary Rhetoric, wishful thinking is neither cogent nor
Aluminum is an element in the boron group with a symbol of Al, and an atomic number of 13. Aluminum is a very soft metal when pure but becomes strong and hard when alloyed, a malleable metal with a silvery gray color. Aluminum is a very reactive element so it is found in nature combined with other elements. Aluminum resists corrosion by the formation of a self-protecting oxide coating. Aluminum is the third most abundant element in the Earth’s crust, following oxygen and silicon. It makes up approximately 8% by weight of the Earth’s surface. Although this is evident, it is also apparent that aluminum is never found by itself in nature. All of the earth’s aluminum has combined with other elements to form compounds and in order to create new aluminum products; it has to be taken out of that specific compound. Aluminum does not rust like other elements, therefore it always remains strong and shiny, which means reused aluminum is almost identical to a brand new piece of metal. An electrochemical process creates aluminum. An electrochemical process is “the direct process end use in which electricity is used to cause a chemical transformation” ( E.I.A. Government). Major uses of electrochemical processes occur in the aluminum industry in which alumina is reduced to molten aluminum metal and oxygen, where than the aluminum can be used into making several different materials. Electrochemical processes, although very useful, can have serious environmental consequences. To help reduce the consequences that the production of aluminum creates, the idea of aluminum recycling comes into play.