Thermochemistry Thermochemistry is the study of heat evolved and absorbed during the chemical reactions. The system is the interest of the universe; the surroundings are the rest of the universe in which the exchange of the energy with the system takes place. Both‚ the system and the surroundings make up the universe. Heat flow is the transfer of heat from a warm place to a cooler one. System to surroundings: Surroundings to system:
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Tube 1 | Tube 2 | Tube 3 | Tube 4 | Tube 5 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0.01 | 0 | 0.04 | 0 | 2 | 0 | 0.02 | 0.01 | 0.07 | 0 | 3 | 0 | 0.03 | 0.02 | 0.11 | 0 | 4 | 0 | 0.05 | 0.03 | 0.15 | 0.01 | 5 | 0 | 0.07 | 0.04 | 0.19 | 0.02 | 6 | 0 | 0.09 | 0.05 | 0.23 | 0.02 | 7 | 0 | 0.10 | 0.06 | 0.27 | 0.03 | 8 | 0 | 0.12 | 0.07 | 0.31 | 0.03 | 9 | 0 | 0.14 | 0.08 | 0.35 | 0.04 | 10 | 0 | 0.15 | 0.09 | 0.39 | 0.05 | 11 | 0 | 0.16 | 0.10 | 0.43 | 0.05 | 12 | 0 | 0.17 | 0.10 |
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Thermochemistry: An Ice Calorimeter Determination of Reaction Enthalpy Curtis M. Franklin Thursday‚ February 14‚ 2013 ABSTRACT An ice calorimetric measurement was used to determine that a reaction involving solid magnesium metal and 1.00M sulfuric acid produces an experimental a value of ∆H = -226 ± 28 kJ/mol at 0°C. This is about 48.4% lower than the expected value reported at 25°C. Introduction Many chemical reactions exhibit themselves by exchanging heat energy‚ either be absorbing
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SCH4U UNIT 3: Thermochemistry Assignment May 2‚ 2011 1. Upon the addition of potassium nitrate to liquid water‚ the beaker feels cold. Explain‚ using appropriate terms: system‚ surroundings‚ heat‚ temperature‚ endothermic or exothermic. The endothermic process whereby the system of KNO3 crystals dissolving in the water absorb energy from the surroundings and the measured temperature of the surroundings (beaker‚ air) drops. 2. The phase change from
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Experiment 6: Work‚ Power and Energy Laboratory Report Eljine Jayson Zhang‚ Shaira Madelene Vinta‚ Mel Marvin Villarante‚ Pauline Alyssa Vega‚ Camille Elijah Valdez‚ Nicole Dominique Vasquez Department of Physical Therapy College of Rehabilitation Sciences‚ University of Santo Tomas España‚ Manila Philippines Abstract This report aims to show how to determine the power output of going up a staircase and going down the same staircase‚ to determine the change in kinetic and potential
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The purpose of the experiment is to determine the effect of cross-linking has on the viscosity of the polymer solution. In the experiment‚ a hotplate was used to heat 50 mL of tap water in a 200 mL beaker to boiling. It took nearly two hours to fully dissolve 2 grams of PVA [poly(vinyl alcohol)] in the water by sprinkling minor amounts bit by bit. 10 drops of 0.1% methyl red indicator was added to PVA solution for the cross-linking part. 0.4 grams of borax was dissolved into 10 mL of hot water. 3
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process of distillation. Distillation is the separation of volatile substances mixed with nonvolatile substances by boiling the mixture to alter the phase of the volatile substance. The researchers used the simple distillation set up to conduct the experiment. 25 ml of The Bar Vodka was used and 7 ml of distillate was collected before a temperature of 95 degrees Celsius was reached. Collected distillate was then subjected to a flammability test to confirm ethanol content. The percent ethanol was computed
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FIRE RESISTANT BALLOON: Materials - 1 matchbox - 1 candle - 1 yellow colored balloon - 1 blue colored balloon - Half a cup of water Procedure: 1. For this experiment‚ the independent variable is whether the balloon is filled with water or not. The dependent variable is what happens to the balloon when it is placed above the lit candle. This is determined by observing the balloon. The constants (control variables) are how much the balloon is inflated and the amount
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EXPERIMENT 1: REACTIONS OF ENOLATE IONS WITH CARBONYL GROUPS Aims In this experiment we used two techniques for the reactions of enolate ions with carbonyl groups. One technique used was Doebner reaction and the other technique used was Claisen-Schmidt reaction. Therefore the aim of this experiment is to synthesize trans p-methoxycinnamic acid and to synthesize dibenzalacetone via an aldol condensation reaction between acetone and benzaldehyde. The products would be recrystallized using ethanol
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Thermochemistry: An Ice Calorimeter Determination of Reaction Enthalpy Shannon Wedepohl 9/17/13 Abstract: During this experiment‚ an ice calorimeter was used to measure the change in volume in milliliters of magnesium metal and 1.00 M of sulfuric acid. We found the experimental molar enthalpy of the reaction to be ∆H = -370 ± 1 kJ/mol at 0˚C. This compares with an expected value of -466.9 kJ/mol at 25 ˚C‚ a 20.75% difference. Introduction: Many chemical reactions truly only
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