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
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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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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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AP Chemistry Kinetics Lab Abstract: The purpose of this lab is to learn how to write law expressions‚ determine orders by graphs‚ and calculate rate constants. By determining the number of drops of sodium hypochlorite necessary to make a diluted food dye change to colorless in less than three minutes helps calculate the absorbance which can then be analyzed to find the pseudo rate constant and eventually leading to the rate constant and the rate law. The results show that the m and n are both 1st
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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
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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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AP Chemistry Lab 2: Analysis of Alum Lab Objective: In this lab we will analyze alum by two techniques in order to verify its identity. The melting point and the mole ratio of hydrated water to anhydrous aluminum potassium sulfate will be determined. Lab Procedure: 1. Use a mortar and pestle to crush alum. 2. Pack the alum in capillary tube‚ and then fasten it to the thermometer. 3. Fasten the thermometer to the ring stand. 4. Immerse the bottom of the
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AP Chemistry Period 1 Molecular Weight of a Condensable Vapor Lab Purpose: The purpose and objective of this lab was to find the molecular weight of a condensed vapor. Materials and Equipment: • Aluminum foil square (around 6cm on a side) • 125 mL flask • Barometer • 3 mL of unknown liquid • 200 mL graduated cylinder • 600 mL beaker • Pin • Balance (0.002g) • Bunsen Burner setup • Rubber band • Thermometer • Ceramic center wire gauze Procedure: 1. A 125 mL flask was obtained
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