CM1191 Experiment 5 Kinetic Studies on the Decomposition of Aspirin Aims To investigate the molar absorptivity of salicylic acid To determine the concentration of dissolved aspirin in heated water at various times To determine the effective rate constant of the decomposition of aspirin in heated water at 85°C. Results and Discussion The molar absorptivity of salicylic acid‚ ε‚ can be calculated from the equation‚ A = εcl. A more accurate value can be obtained by finding the gradient of a graph
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| Experiment 2 | Calorimetry | | Chemistry 1310 | 7/21/2013 | | This experiment is to calibrate a constant pressure calorimeter to experimentally determine a series of heats of reaction that will be used to predict the enthalpy of reaction for another reaction using Hess’ Law and to determine heats of dissolution for a number of ionic salts that will be used to predict lattice energy again by using Hess’ Law. Heat may increase during experiment and undergo exothermic reaction
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Thermodynamics & Heat Engines Basic Concepts Thermodynamics • • • • • • Thermodynamics= therme + dynamis Latin word therme means = heat Dynamis means = power or forces causing motion so‚ overall meaning of thermodynamics is heat–power or force interaction between system and surrounding. for example It is based upon general observation and those may be formulated in form of thermodynamic law as – Zeroth law of thermodynamics First law of thermodynamics Second law of
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observe results and patterns. Graph 1 shows the increased decomposition of H202 that was produced when the amount of catalase was increased by 2 disks every time. The more catalase that was added‚ the faster the decomposition was. The fastest and most efficient decomposition was when there were 10 catalase filter papers in 10mL of H202. The graduated cylinder was filled with oxygen in 1 minute and 46 seconds. Graph 2 shows that the decomposition rate stayed relatively similar with two catalase disks
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Class X Question 1: Chapter 1 – Chemical Reactions and Equations Science Why should a magnesium ribbon be cleaned before burning in air? Answer Magnesium is very reactive metal. When stored it reacts with oxygen to form a layer magnesium oxide on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper to remove this layer so that the underlying metal can be exposed into air. Question
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Chemical Reactions What is a Chemical Reaction? Types of Chemical Reactions Redox Reactions Nonredox Reactions Classifying Reactions What is a Chemical Reaction? A chemical reaction is a process in which the identity of at least one substance changes. A chemical equation represents the total chemical change that occurs in a chemical reaction using symbols and chemical formulas for the substances involved. Reactants are the substances that are changed and products are the substances that are
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Q.1 Bond enthalpy of fluorine is lower than that of chlorine‚ why? Q.2 Give the IUPAC name of the following compound: (CH3)3-C-C-COOH ║ O Q.3 On increasing temperature‚ activation energy of a reaction decreases‚ why? Q 4 Which of the following is most effective electrolyte in the coagulative of AgI/Ag+sol? K2SO4‚ MgCl2‚ K4[Fe(CN)6] Q.5 Write the reaction when glucose is heated with excess of HI. Q.6 Which Xe compound has distorted octahedral shape? Q.7 What is the denticity of
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would be a better substance to use commercially‚ because fuels need to have a high energy output and low storage volume to be used as fuel. Our hypothesis was proven correct‚ as this experiment allowed us to gain a better grasp on the concepts of enthalpy‚ heat capacity‚ and thermochemical reactions‚ all of which were necessary for us to understand to complete the task. Paraffin wax produces more energy per gram than Ethanol based on our test results‚ and simply by the molecule comparison itself.
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Enzyme Catalase under optimum conditions‚ speeds up the decomposition of hydrogen peroxide The students have studied that Hydrogen peroxide is a jeopardy to metabolism if it’s not obliterated. Enzymes are proteins produced by living cells of that act as catalysts which affects the rate of biochemical reaction by speeds up the breakdown of hydrogen peroxide into water and oxygen gas. The students have formed a hypothesis toward this experiment. If the speed of decomposition of hydrogen peroxide is related t
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The principal decomposition process begins with a rapid dehydration and decomposition of hydroxyl groups in glucose rings to form water molecules. During this step the main chain breaking occurs when C-C-H‚ C-O and C-C bonds break (Liu et al.‚ 2010). The gaseous decomposition products consist mainly of H2O‚ CO‚ CO2‚ compounds as CH4 and C2H4. A prominent peak is recorded between 271oC and 404
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