LAB REPORT ON VERIFICATION OF HESS’S LAW Our purpose of doing this lab was to prove the Hess’s law correct. Hess’s law suggests that the enthalpy change of a reaction must be equal to the sum of the enthalpy changes of the related reactions which lead to the original reactions. The following are the reactions at the lab; 1) NaOH ( s) NaOH (aq) 2) NaOH (aq) + HCl (aq) NaCl (aq) + H2O (l) 3) NaOH (s) + HCl (aq) NaCl (aq) + H2O (l) As explained before‚ Hess’s Law states that the enthalpy
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Heats of Reaction – Hess’s Law Overview Hess’s Law states that the energy change for a reaction depends on the enthalpy of the reactants and products and is independent of the pathway of the reaction. In this experiment you will use calorimetry to measure the heats of reaction for three reactions: Reaction 1 Reaction Equation NaOH(s) → Na+(aq) + OH-(aq) Solid NaOH is dissolved in water 2 Na+(aq) + OH-(aq) + H+(aq) + Cl-(aq) → Na+(aq) + Cl-(aq) + H2O(l) Solutions of NaOH and HCl are mixed 3 NaOH(s)
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Joshua McMahon IB Chemistry Matt Chase 3A 11/5/14 Finding the Molar Enthalpy Change of sodium bicarbonate by using Hess Law Research Question By using Hess’ Law‚ can the Molar Enthalpy Change of sodium bicarbonate be calculated? Hypothesis If we are attempting to determine the enthalpy change of the thermal decomposition of Sodium Bicarbonate‚ then Hess’s Law will be will be the most effective. Introduction Sodium bicarbonate‚ more commonly known as baking soda‚ has many uses in todays
Free Thermodynamics Temperature Enthalpy
Ben J. Kaiser S0510 Project Title Hess’ Law and Thermochemistry Abstract Objectives/Goals Background: Hess# law states that if a reaction can be carried out in a series of steps‚ the sum of the enthalpies for each step should equal the enthalpy change for the total reaction. This statement emphasizes the conservation not only of matter‚ but also of energy. If certain reactions are difficult to study‚ their enthalpy can be calculated from Hess# law. The purpose of this experiment is to use
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Hess’ Law To find out the enthalpy change of Mg+ ½O2=MgO‚ we used a calorimeter‚ thermometer‚ 0.2 g of Mg‚ 0.2 g of MgO‚ and 2.0 M of HCl. We used a thermometer to measure the initial and final temperatures in Celcius. We recorded the initial temperature of the HCl. After we put the Mg or MgO into the calorimeter‚ we put in the HCl and covered it using a lid‚ mixed it around with the thermometer‚ and recorded the final temperature. We also used this method to find the enthalpies of the equations
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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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IB CHEMISTRY LAB REPORT PRACTICAL 13 : HESS’SLAW PRACTICAL ASSESSMENT : DCP‚CE Collecting raw data: Part 1 Weight of magnesium ribbon‚Mg‚m/g (± 0.01) Initial temperature of hydrocloric acid‚HCl‚T/C (± 0.05) Final tmperature of HCl + Mg‚T/C (± 0.05) 0.31 26.00 57.50 Part 2 Weight of magnesium oxide‚MgO‚m/g (± 0.01) Initial temperature of hydrocloric acid‚HCl‚T/C (± 0.05) Final tmperature of HCl + Mg)‚T/C (± 0.05) 0.50 27.50 40.50 Processing
Free Thermodynamics Enthalpy Measurement
Experiment 11 Calorimetry and Hess’s Law Purpose- To determine the change in enthalpy for four reactions using calorimetry and Hess’s Law Procedures: A. Calibration of the Calorimeter 1. Obtain two copper cylinders and a Styrofoam cup with lid from your lab instructor. Check out a digital thermometer display from the storeroom window. 2. Set up a hot water bath using a 600mL beaker‚ ring stand‚ and Bunsen burner. Weigh the two copper cylinders
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Hess’ Law of Heat Summation Hess’ Law states that: "The enthalpy change for any reaction depends on the products and reactants and is independent of the pathway or the number of steps between the reactant and product". BASICALLY: Hess’ Law states "the heat evolved or absorbed in a chemical process is the same whether the process takes place in one or in several steps" >This is also known as the "law of constant heat summation". All it means is that no matter how many steps the chemical
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Conclusion to Motion Lab Kerreon Wright 3rd Period Ms. Gislason The purpose of this Motion Lab was to find the acceleration of a steel marble going down a straight track six different times to figure out how an object’s mass affects acceleration. It doesn’t due to Newton’s second law of motion. There were six different accelerations for each trial and they are: 7.88 m/s squared‚ 6.78 m/s squared‚ 6.07 m/s squared‚ 5.57 m/s squared‚ 4.32 m/s squared‚ and 5.11 m/s squared. It’s possible
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