Thermodynamics-Enthalpy of Reaction and Hess’s Law Purpose To demonstrate the principle of Hess’s Law and to find the heat capacity of the coffee cup calorimeter using three different reactions. Data Tave = (46.4-45.2)/2 = 45.8 qwater = -(100g)(4.184)(46.56-45.8) = -318 J Ccal = 318J/(46.56-21.2) = -12.53J/g*C Tinitial = (27.1+23.8)/2 = 25.45 qrxn = -(100g)(4.18)(38.43-24.45)+(-12.53x12.98) =-5400J/.1mol(1J/1000kJ) = -54.0 kJ/mol Tinitial = (26.0-24.5)/2 qrxn =-(100g)(4
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of the trend line for the other isomers to have a higher energy‚ while the less steep trend gradient means this switches over between 3 and 4 carbon‚ indicating that isomers with a carbon atom number greater than that will have increasingly lower enthalpy levels. This variance in results when performed under near identical experimental conditions‚ suggests that energy produced during the combustion reactions
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Heat of Reaction and Hess’s Law Introduction: Hess’s Law is a very useful relationship that allows the calculation of the heat of reaction for reactions on paper (without carrying out an actual experiment of that particular reaction). You must first know the heats of reaction for related reactions that add algebraically to give the desired reaction. If it can be shown that reaction 1 + reaction 2 = reaction 3‚ then Hess’s Law states that H1 + H2 =H3. Thus‚ if you know the heats of reaction
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Determining the Enthalpy Change for a Redox Reaction Criteria Assessed: Background Design Research Question What is the enthalpy change between the reaction of Zinc reducing Copper II ions? Purpose Determine the change in enthalpy for the redox reduction of zinc reducing Copper II ions. Independent Variable Dependent Variable The change in temperature Controlled Variables Materials/ Apparatus * Zinc powder * 2‚ Foam cups * 10 cm3 pipette * stopwatch * 1.00 M Copper
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Energy of a Peanut Abstract: In this experiment‚ we will use a Calorimetry technique to determine the heat of combustion of a peanut and a marshmallow. Using a simpler version of a calorimeter‚ we will burn a peanut. First we measure the peanut‚ and after burning we will measure the waste product left after the burning of the peanut. We will measure the volume of water that melted due to the heat generated by the peanut and the marshmallow. This experiment will show us how many calories are actually
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Chemistry Lab Report Determining Best Calorimeter Dylan Mendonca 12-B Background: Calorimetry is the science of measuring the heat of chemical reactions or physical changes. Calorimetry is performed with a calorimeter. A calorimeter can be any container from a cup to a Calorimeters need to be well insulated as calorimetry relies on the fact that temperature change only occurs within the solution and that no heat escapes to the surroundings. That is why it is important that calorimeters are well
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Introduction In this investigation‚ me and my partners performed an experiment to find the different energy contents in food and different amounts of energy released when consumed. Throughout this experiment our procedure was to take different food samples and use a device known as a calorimeter made from a can of aluminum‚ one large paper clips and a string of copper wire to measure the amount of thermal energy released during a reaction. By measuring the temperature difference before and after
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Activity 33 PS-2826 Latent Heat of Fusion Thermodynamics: phase change‚ latent heat of fusion‚ melting Qty 1 1 1 1 1L 0.5 L 1 Equipment and Materials PASPORT Xplorer GLX Fast-Response Temperature Probe (included with GLX) Basic Calorimetry Set (1 calorimeter cup) Balance Water‚ about 15 degrees warmer than room temperature Ice‚ crushed Towel Part Number PS-2002 PS-2135 TD-8557 SE-8723 Purpose The purpose of this activity is to determine the amount of thermal energy needed to change a specific
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All chemical reactions are processed through energy exchanges. Chemical reactions either absorb energy or release energy into their surroundings. In thermodynamics‚ endothermic reactions absorb energy where exothermic reactions release energy. In this experiment‚ we will be observing the chemical reactions that occur when a specific liquid is combined with a specific solid. We will measure the temperature of the liquid before the solid is added. Then we will measure the temperature of the liquid
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Mofu Lin Ms. Conte 15/3/12 IB Chemistry Soda can calorimeter(Energy content of food) Lab report Introduction We‚ human needs energy to live and for movements. Thus‚ we eat and combust food to release its heat energy in our bodies. In this experiment‚ we will determine how much heat energy released when we eat snack foods such as popcorn or potato chips. This lab includes three burning tests of different foods with different energy contents. Calorimetry is the science associated with determining the
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