UNSTEADY STATE HEAT TRANSFER Heat transfer processes are prominent in engineering due to several applications in industry and environment. Heat transfer is central to the performance of propulsion systems‚ design of conventional space and water heating systems‚ cooling of electronic equipment‚ and many manufacturing processes (Campos 3). Unsteady state conduction is the class of heat transfer in which the temperature of the conducting medium varies with time and position. This occurs frequently in
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Aim: i) To find the relationship between supplied energy and change in temperature of water. ii) To find the specific heat capacity (SHC) of water. Hypothesis: As time increases so does the temperature since the water is exposed to the heated wire for a longer period of time. Variables: The Dependent Variable is the temperature of the water‚ and since the Energy is calculated using temperature it is a dependent variable as well. The constant variables are the voltage and current. Theory:
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The Lab Report‚ Significant Figures & Working with Numbers CHMY 142-18 Experiment 1 September 4th‚ 2009 Introduction: This experiment is dealing with the relative accuracy of an individual measurement. Data will be provided to perform the calculations asked for. The purpose of this experiment is to know how to use significant figures and to get formularized with making proper laboratory reports. Procedure: Use the data table’s information to solve the missing
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Addition of carbon Combustion is the rapid burning of fossil fuels. Stored carbon in coal‚ oil and natural gas returns to the atmosphere when these fossil fuels are burnt and during natural combustion occurrences such as volcanic eruptions. Fossil Fuels such as coal are constructed when a living organism dies and decomposers‚ ie Fungi and microbes are unable to decompose it. After the organic material is untouched for millions of years‚ it eventually turns into fossil fuels. Petroleum‚ coal and
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Pos t-Lab Data Summary Note : some questions will display a variable like "nCount" or "SyInput" instead of an actual number in the data summary. Q# Question Text 5) Data Entry - No Scoring Enter the precise mass in GRAMS of the potassium iodate used to prepare your primary standard solution. Your mass precision should be reported to a thousandth of a gram‚ i.e. 0.302. (Use 3 significant figures.) Your Answer: 0.536 No Points Possible 6) Scoring Scheme: 3-3-2-1 If one had weighed out precisely
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References: Tissue‚ Brian M. (1995). Analytical Chemistry. The Chemistry Hypermedia Project ‚ from http://www.files.chem.vt.edu/chem-ed/index.html Sauro‚ Jeff (2004)
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PROBLEM Investigate the heat energy in a range of alcohol’s used as fuels. HYPOTHESIS I predict that octanol will release the most heat energy. This is because there is more bond energy in that molecule than the other alcohols. Within a molecule there are bond energies that are holding the atoms together. When the fuel combusts a chemical reaction takes place‚ this breaks the bonds‚ this requires energy‚ and makes new bonds this gives out energy. The energy differences between the two tell us
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Aim To find out difference in the heat of combustion for different types of alcohols. Hypothesis The higher the number of carbon atoms in an alcohol is‚ the higher the energy for the heat of combustion. Alcohol is a homologous series‚ a series of organic compounds with similar formula and chemical properties‚ and increase in molecular size and mass. When the equations for combustion of these alcohols are listed in the order of increasing number of carbon atoms‚ Methanol 1 CH3OH(l) + 3/2 O2(g)
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element. 2) Take the remaining mixture and add 50ml of distilled water to the remainder and combine in a beaker. 3) Heat the mixture and bring to a boil to rid the mixture of salt and benzoic acid. Separate into two cups‚ and observe how when the mixture is left to cool down in an ice bath‚ the benzoic acid crystallizes as it decreases in heat. 4) In the remaining cup‚ heat the sand until the solution is completely dissolved. The sand should be left. 5) Using the cooled solution of benzoic
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Magnesium Mg(Z=12) in Group 2 Alkaline Earth Metals The structure of the element: Giant lattice metallic structure of immobile positive metal ions surrounded by a ’sea’ of freely moving mobile electrons (so-called delocalised electrons). Physical properties: A moderately hard silvery-white solid; mpt 649oC; bpt 1090oC; good conductor of heat/electricity. Group‚ electron configuration (and oxidation states): Gp2 Alkaline Earth Metal; e.c. 2‚8‚2 or 1s2 2s2 2p6 3s2; (+2 only) e.g. MgCl2
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