2.3 Magnesia-Doloma Refractories: The MgO-CaO system is remarkable for the high liquidus and solidus temperatures over the complete range 100% MgO- 100% CaO‚ as the eutectic for the CaO–MgO binary system occurs at 2370 ºC [3‚ 52]. MgO–CaO bricks are high-value refractories composed of lime (CaO) and periclase (MgO). MgO –CaO refractories has some advantageous and disadvantageous compared to MgO and CaO refractories (Table 1). Table 1 Typically‚ these refractories are composed by 50-80 wt. % of
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AIR POLLUTION Assalamualaikumwarahmatullahiwabarakatuh and a very good morning to my beloved teacher ‚Mr Norhisyam ‚and my fellow friend .Before I begin my speech let I introduce myself.Hello my name is Amirul Zharfan . I am from 102 class. My college number is CM131027‚ and my science teacher is Mr Norhisyam.Alright ‚ Today I would like to talk about air .Dear friends‚everyone know air is very important for us.As we know‚it is one
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be rolled into thin foil (N/A‚ 1996-2012). It is a good conductor of heat and electricity‚ and it is a solid in its standard state. One of Aluminums chemical properties is that in moist air‚ it combines slowly with oxygen to form aluminum oxide. The aluminum oxide forms a very thin‚ whitish coating on the aluminum metal (N/A‚ n.d.). This element is also a fairly active metal. It reacts with many hot acids and with alkalis. Aluminum also reacts quickly with hot water‚ and in powdered form‚ it catches
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What are the consequences of cutting down trees? There are many consequences for the environment of cutting down trees. Known as deforestation it has huge effects on the environment. It one very big effect is the loss of biodiversity which is a direct effect of cutting down trees. There are many reasons of which humans act out deforestation. For example is so that we can set up cattle farms. Also grow crops of which can then be sold to people. Another reason is for urbanisation and for the building
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ASSIENMENT [2] METAL FORMING REVIEW QUESTIONS 1- What are the differences between bulk deformation processes and sheet metal processes? Answer. In bulk deformation‚ the shape changes are significant‚ and the work parts have a low area-to-volume ratio. In sheet metal processes‚ the area-to-volume ratio is high. 2- Extrusion is a fundamental shaping process. Describe it. Answer. Extrusion is a compression process in which the work material is forced to flow through a die orifice‚ thereby forcing
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Designation: C 114 – 07 Standard Test Methods for Chemical Analysis of Hydraulic Cement1 This standard is issued under the fixed designation C 114; the number immediately following the designation indicates the year of original adoption or‚ in the case of revision‚ the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. 1. Scope* 1.1 These test methods cover
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Calcium Phosphate b) Magnesium Hydroxide c) Aluminum chloride. 9. State the Postulates of Dalton Theory? [3] 10. Find the percentage of water of crystallization in feSO4. 7H2O. [3] 11. 2.42g of copper gave 3.025g of a black oxide of copper‚ 6. 49g of a black oxide‚ on [3] reduction with hydrogen‚ gave 5.192g of copper. Show that these figures are in accordance with law of constant proportion? 12. A compound was found to have the following percentage composition by mass Zn = 22.65%‚ S = 11
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reactions starting and finishing in elemental copper metal‚ and to practice quantitative laboratory techniques. Cu → Cu(NO3)2 → Cu(OH)2 → CuO → CuSO4 → Cu Cu(NO3)2 = copper nitrate Cu(OH)2 = copper hydroxide CuSO4 = copper sulfate CuO = copper oxide Experiment 1(a) Cu + 4HNO3 → Cu(NO3)2 + 2NO2↑ + 2H2O NO2 given off as a coloured gas* H(NO)3 Transfer contents to beaker containing 100 mL of water Cu 100mls H2O Wash conical flask with 10 mL of water *Carry out reaction in
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Copper and Molybdenum Deposits in the United States Copper and molybdenum resources were not recognized as valuable commodities until economic needs demanded the collection and processing of these minerals in large amounts. The most expansive deposits of copper and molybdenum occur in massive low grade ores and are found in intrusive porphyry formations‚ although many smaller sized but higher grade ores are located in non-porphyry areas. The nation has abundant domestic copper ore reserves but
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Tantalum Tantalum is a shiny‚ silvery metal which is soft when is pure. It is almost immune to chemical attack at temperatures below 150 C. Tantalum is virtually resistant to corrosion due to an oxide film on its surface. Applications Tantalum finds use in four areas: high-temperature applications‚ such as aircraft engines; electrical devices‚ such as capacitors; sirurgical impants and handling corrosive chemicals. It is rarely used as an alloying agent because it tends to make metals brittle
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