such as metals and mineral building material by surrounding media‚ which are usually liquid (i.e. corrosive agents)." Most metals corrode. During corrosion‚ they change into metallic ions. In some cases‚ the product of corrosion itself forms a protective coating. "For example‚ aluminium forms a thin protective oxide layer which is impervious to air and water. In other cases (e.g. iron)‚ however‚ the coating either flakes off or is pervious to both air and water. So the whole piece of metal can corrode
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ELECTROPLATING Electroplating is the application of electrolytic cells in which a thin layer of metal is deposited onto an electrically conductive surface. Electroplating is a plating process that uses electrical current to reduce cat ions of a desired material from a solution and coat a conductive object with a thin layer of the material‚ such as a metal. Electroplating is primarily used for depositing a layer of material to bestow a desired property (e.g.‚ abrasion and wear resistance‚ corrosion
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Lab design –Voltaic Cells Aim Of Experiment In this experiment‚ we are going to make a battery by making an electron current between the metals Zinc and Copper. We aim two study the voltaic cells and the transfer of electrons from the metal to the ion. The tendency for the electrons to flow from one chemical to another‚ such as from the zinc metal to the copper ion as shown here‚ is something that can be channeled and controlled. Channeling the flow of electrons is what we will take up in this
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times the mass of all the heavier elements‚ combined. 3. Lithium Name: Lithium Atomic number: 3 Atomic Weight: 6.941 grams/mole Group in periodic table: 1 Group name: Alkali metal Color: Silvery white/grey Lithium is solid only about half as dense as water and lithium metal is the least dense metal. Lithium is known as losing its electron‚ so it becomes Li+. Lithium is mixed with aluminum and magnesium for light-weight alloys and is used in batteries‚ some greases‚ some glasses‚ and
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Pg1Pg1 SCIENCE EXPERIMENTS ON FILE ™? Revised Edition 5.40-1 Potato Battery Lois Fruen and Chelen Johnson Topic Construction of a battery Time 45 minutes to 1 hour Safety ! Please click on the safety icon to view the safety precautions. Adult supervision is necessary for the soldering of the alligator
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Relationship between a model and Similitude For a model‚ similitude is achieved when testing conditions are created such that the test results are applicable to the real design. There are some criteria that are required to achieve similitude; 1. Geometric similarity – The model is the same shape as the application (they are usually scaled). 2. Kinematic similarity – Fluid flow of both the model and real application must undergo similar time rates of change motions. (Fluid streamlines are similar)
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applicable to fluids makes even the simplest tests to be a time consuming exercise. However‚ despite all these obstacles‚ over the years‚ people have managed to properly quantify the flow of a fluid. By establishing a dimensionless number called the Reynolds’ number‚ it is possible to divide various flows into three separate regions wherein each region with its governing equations. Introduced by the famous mathematician Stokes and
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Consideration of the basic factors affecting road vehicle drag and their associated affects 0718572 School of Engineering‚ University of Warwick Coventry‚ West Midlands‚ U.K Abstract: It is possible to improve the aerodynamic efficiency of road vehicles and reap many benefits. Fuel consumption being one of them‚ this report identifies how basic theoretical and experimental fluid mechanics can work in harmony to allow one to understand the key mechanisms that affect the aerodynamic properties
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2003. Goddess: The Classical Mode. New Haven and London: Yale University Press‚ Metropolitan Museum of Art. Wendors‚ R.‚ 1996. Sir Joshua Reynolds: The Painter in Society. Harvard University Press‚ National Portrait Gallery Publications. Steegman‚ J.‚ 1933. Sir Joshua Reynolds. London & Southampton: The Camelot Press Ltd. Penny‚ N.‚ 1986. Reynolds. Royal Academy of Arts‚ London: Weidenfeld & Nicolson. Rosenthal‚ M.‚ 1999. The Art of Thomas Gainsborough. New Haven: Yale University
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The equation for the decomposition of potassium chlorate is: 2 KClO3 (s) 2 KCl (s) + 3O2 (g) Other metal chlorates behave similarly when heated; forming oxygen gas and the corresponding metal chloride. The reaction may be speeded by adding some MnO2 catalyst. Metal chlorate Metal chloride + oxygen In this experiment a weighed quantity of potassium chlorate is heated. The oxygen formed in the reaction is driven off and
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