Zn(s) + CuSO4(aq) ------ Cu(s) + ZnSO4 (aq) The enthalpy changees for two different reactions will be determined practically. In the first‚ experiment delta H will be determined directly and account will be taken of heat losses by extrapolation of an appropriate graph. The second experiment involves teh inderect determination of an enthalpy change using Hess’ Law. The temperature can be measured manually but this experiment is ideal for using a data logger. In the first experiment we are trying
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MA‚ PAULINE Date Performed: 10 SEPTEMBER 2014 NACIONGAYO‚ DANIELLE Date Submitted: 17 SEPTEMBER 2014 TEDERA‚ YVES HEAT EFFECTS AND CALORIMETRY Experiment No. 2 I. RESULTS A. Determination of Heat Capacity In this experiment‚ an improvised calorimeter was used to determine the heat capacity. The calorimeter weighed 4.47 grams prior to the addition of water. Tap water‚ 40 mL to be exact‚ was added to the calorimeter which increased the weight to 43.87 grams. The water was measured using
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Greek metry meaning to measure‚ is the science of measuring the amount of heat‚ q.1 The amount of heat is absorbed (endothermic where qrxn >0) or released (exothermic where qrxn <0) by the system with respect to its surroundings is the change in enthalpy‚ ΔH. This is quantified in calorimetry by a device called calorimeter. There are two types of calorimeters. The first type is the called the bomb calorimeter. It is ideally suited for measuring the heat evolved in a combustion reaction. Because
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C60; ΔH = 2320 kJ what is ΔH for the following thermochemical equation? 1/60C(s)>>>> C(s) A) +38.7 kJ B) +2320 kJ C) -129 MJ D) -2320 kJ E) -38.7 kJ E is the correct answer. Since the forward reaction has a positive enthalpy‚ the reverse will have a negative enthalpy. Also we are dealing with 1/60th of the original amount‚ so (2320 kJ)*(1/60 mol)*(-1) = -38.7 kJ 3. Exactly 173.9 J will raise the temperature of 10.0 g of a metal from 25.0°C to 60.0°C. What is the specific heat capacity
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Determining the Enthalpy of Combustion of a Wood Chip IB Chemistry 12 September 18‚ 2014 Ryan Ingham Table 1: Raw data collected from the temperature probe and scale for the water‚ the aluminum can and the wood chip. (Quantitative) Quantity Initial Temperature (±0.1K) Final Temperature (±0.1K) Aluminum Can 46.29g (±0.01g) 296.5 314.7 Water 250g (±0.1g) 296.5 314.7 Wood Chip Before: 4.64g(±0.01g) After: 3.29g (±0.01g) NA
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The goal of this experiment is to determine the enthalpy of combustion of naphthalene by means of a bomb calorimeter. First‚ the bomb calorimeter was standardized using benzoic acid and the average heat capacity of the bomb calorimeter was calculated to be 10.60.3205 kJ/K. From that‚ the These results show that heats of combustions of unknown substances can be determined via bomb calorimetry. Introduction The first law of thermodynamics states that energy is conserved.2 Using that law it can
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NO books‚ lecture notes‚ cell-phones‚ PDAs‚ laptops‚ talking. For Multiple Choice Problems (on the back) - Circle your answer to each question BELOW. If more than one answer is circled for a question no credit will be given for it. 1. [ out of 16 pts ] A mixture of gases contains 66.0 g CO2‚ 2.02 g of H2‚ and 16.0 g of O2. If the total pressure of the mixture is 725 torr‚ what is the partial pressure of each gas? [ do not neglect significant figures! ] SHOW YOUR WORK to
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measured the temperature of the system for the next three minutes. I could then use the data collected to determine the heat of neutralization for the reaction. The scientific principles addressed by the lab were using a calorimeter to measure the enthalpy change (or heat of reaction) of a system‚ and determining how much heat was
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to solve for the specific heat of the metal. The molar mass of the metal was found by using the equation: MM = 25 / C (J/g° C) Experiment B was conducted to find the heat of solution of an unknown solid. After finding the heat flow of the water‚ enthalpy change of the reaction was found by using the equation: Q reaction = H
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Zinc Tris-thiourea Sulfate (ZTS) is a Semi Organic Nonlinear Optical (NLO) material which finds applications in the area of laser technology‚ optical communication‚ data storage technology‚ and optical computing etc. The author has successfully grown ZTS crystal by gel method. Gel technique has been adopted at ambient temperature to attain better result. The grown crystals were transparent and colourless. The crystal size has been obtained the range about 5mm X 3mm X 2mm. Thermal study of ZTS crystal
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