DATE PERFORMED: NOVEMBER 14‚ 2012 CALORIMETRY INSTITUTE OF CHEMISTRY‚ COLLEGE OF SCIENCE UNIVERSITY OF THE PHILIPPINES‚ DILIMAN QUEZON CITY‚ PHILIPPINES RECEIVED NOVEMBER 20‚ 2012 INTRODUCTION Heat is a form of energy that can be passed from an object with high temperature to an object with low temperature. The heat required to change the temperature of a substance by 1 K is called heat capacity. A calorimeter is a device commonly used to measure the amount of heat that
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Practice problems for CHE 101 final Approximate breakdown of points: Old Ch. 2: 10 Ch. 3: 15 Ch. 4: 15 Ch. 5: 15 Ch. 6: 15 Ch. 7: 15 Ch. 10: 15 New Ch. 8: 40 Ch. 9: 40 Ch. 11: 20 Final: May 3 at 11:45 am. Rooms posted on UBlearns Check your points entered on posted grade point totals. Keep all assignments. 1) For the following molecules‚ give the Lewis structures‚ the molecular geometry‚ hybridization‚ and whether the molecule is polar or nonpolar
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2I-(aq) + H2O2(aq) + 2H+I2(aq) + 2H2O(L)‚ and to then determine if a change in temperature has an effect on that rate of this reaction. It was found that the reaction rate=k[I-]^1[H2O2+]^1‚ and the experimental activation energy is 60.62 KJ/mol. Introduction The rate of a chemical reaction often depends on reactant concentrations‚ temperature‚ and if there’s presence of a catalyst. The rate of reaction for this experiment can be determined by analyzing the amount of iodine (I2) formed
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Nutritional science investigates the metabolic and physiological responses of the body to diet. With advances in the fields of molecular biology‚ biochemistry‚ nutritional immunology‚ molecular medicine and genetics‚ the study of nutrition is increasingly concerned with metabolism and metabolic pathways: the sequences of biochemical steps through which substances in living things change from one form to another. Carnivore and herbivore diets are contrasting‚ with basic nitrogen and carbon proportions
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Antioxidants Antioxidants are natural compounds that are present in some foods‚ which help stabilize free radicals (a harmful unstable molecule produced naturally in the body as a bi-product of oxidation) and prevent them from damaging other cells. Importance of antioxidants Free radicals that are formed in the body are highly dangerous‚ as they are unstable molecules with an odd number of electrons. Since they have an odd number of electrons they seek and steal electrons from
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1-1 Chapter 1 INTRODUCTION AND BASIC CONCEPTS Thermodynamics 1-1C Classical thermodynamics is based on experimental observations whereas statistical thermodynamics is based on the average behavior of large groups of particles. 1-2C On a downhill road the potential energy of the bicyclist is being converted to kinetic energy‚ and thus the bicyclist picks up speed. There is no creation of energy‚ and thus no violation of the conservation of energy principle. 1-3C There is no truth to his claim
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six different runs of a reaction between thiosulfate and hydronium ion was used to plot a linear equation based on the Arrhenius equation. From the equation‚ the activation energy‚ Ea‚ of the reaction was obtained with an experimental value of 58.03 kJ/mol. The experiment showed that higher temperature leads to an increase in the rate of reaction‚ that a decrease in temperature would do the reverse‚ and that the concentration of reactants is directly proportional to the rate of reaction. The experiment
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K (at zero K the substance has no entropy)‚ a substance will gain a certain amount of energy per mole and this will differ from substance to substance. Entropy values (S) are always positive and usually quite small so we measure them in J not kJ. Note: The units of entropy are J mol-1 K-1. Eg. Copper has an entropy (S) of 33.3 J mol-1 K-1 Questions 1. How much energy is
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Alcohol: Balancing Risks and Benefits Introduction Throughout the 10‚000 or so years that humans have been drinking fermented beverages‚ they’ve also been arguing about their merits and demerits. The debate still simmers today‚ with a lively back-and-forth over whether alcohol is good for you or bad for you. It’s safe to say that alcohol is both a tonic and a poison. The difference lies mostly in the dose. Moderate drinking seems to be good for the heart and circulatory system‚ and probably
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SERANGOON JUNIOR COLLEGE General Certificate of Education Advanced Level Higher 2 CHEMISTRY JC2 Preliminary Examination Paper 1 Multiple Choice Additional Materials: Data Booklet Optical Mark Sheet (OMS) 9647/01 23 August 2011 1 hour READ THESE INSTRUCTIONS FIRST On the separate multiple choice OMS given‚ write your name‚ FIN/NRIC and class in the spaces provided. Shade correctly your class and FIN/NRIC number. Eg. If your NRIC is S9306660Z‚ shade S9306660Z for the item “index number”. There
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