University of Balamand Faculty of Engineering Department of Chemical Engineering Chemical Engineering Lab CHEN 215 Title: Study of Gold metal Date: 14/01/2013 Submitted to: Dr Sami Habib Submitted by: Jamil Mahfoud (A1010659) I- General introduction about metals: a- Historical background Back to 6000 BC‚ process metallurgy is known as one of the oldest applied sciences. Despite that the form of metals was very basic but it has a big impact on the society because of its wide
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Sometimes I can’t help asking myself‚ what’s the matter with our plant? Distinct seasons has gone forever‚ the summer temperature refresh the annual historical limit‚ 2012 is the hottest year of United States of America since meteorological records in 1895‚ the annual average temperature is 12.94 ℃‚ breaking the record in 1998. The polar ice and snow ice accelerate to melt at the speed of 8% for every year‚ obviously we suffer global temperature warming‚ It’s predicted if the earth’s surface temperature
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allow it to move freely within the atomic lattice – in a semiconductor‚ unlike a conductor which has very small or no band gaps and/or an insulator which has very large band gaps. Semiconductors are of great interest as they allow a material’s conductivity/resistivity to be manipulated. Due to the Pauli exclusion principle‚ a filled valence band cannot carry a current. Thus‚ in a semiconductor‚ electrons must be either added to the conduction band or removed from the valence band in order for current
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where conductors are relatively small and close together‚ and inside an enclosure: the heat produced can melt the tracks. Thermal and electrical conductivity often go together. For instance the sea of electrons causes most metals to act both as electrical and thermal conductors. However‚ some non-metallic materials are practical electrical conductors without being good thermal conductors.[citation
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such as melting point‚ solubility‚ and conductivity‚ can be used to predict the type of bond that binds the atoms of the compound. In this experiment‚ you will test six compounds to determine these properties. Your compiled data will enable you to classify the substances as either ionic or covalent compounds. OBJECTIVES Compare the melting points of six solids. Determine the solubilities of the solids in water and in ethanol. Determine the conductivity of water solutions of the soluble solids
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because of relatively less thickness of the Fluoropolymer as against the lining the heat transfer is better‚ heat sensing is better. Also in coating process the Fluoropolymer layer becomes an integral part of the metal to be coated hence‚ it can take thermal shock better then lining which is normally loosely
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terms‚ assuming a known flow rate of fresh air entering the cabin‚ the amount of thermal heat gain can be calculated
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From the experiment‚ it was determined that Sodium chloride had a crystalline structure‚ even after being broken into smaller pieces with a hammer. Even though there was two different types of Sodium chloride‚ coarse and fine‚ they still had a symmetrical‚ three-dimensional shape. All ionic compounds have this structure. It was also found that Sodium chloride had a high melting point and sugar had a low melting point. This is because Sodium chloride is ionic and the bonds holding it together take
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ABOUT PHYSICS AND SOME MAIN TOPICS: 1. Temperature 2. Heat and thermal heat (energy) 3. Heat capacity 4. Phases of water 5. Expansion 6. Ideal gas 7. Laws of thermodynamics 8. Heat capacity of gas 9. Specific heat capacity TEMPERATURE is a physical quantity that is a measure of hotness and coldness on a numerical scale.[1] It is a measure of the thermal energy per particle of matter or radiation; it is measured by a thermometer‚ which may be calibrated
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The surgical technique of laser induced photo thermal therapy‚ used for selective destruction of cancerous cells inside the body of a tissue phantom‚ considers employing a laser source to target radiation on a tumor region‚ for the purposes of inducing a local hyperthermia to destroy the cancerous cells. It has been observed that upon raising the cell temperature beyond 43°C [1] for a specified amount of time‚ necrosis of the biological cells can be achieved. Further‚ coupled with the temperature
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