Chemistry 1211 Prof. Dan Schwartz Exam #2 Thursday‚ 3/13/2003 7:00 – 8:30 P.M. There is a single correct choice for each question. Answer all questions on the Scantron sheet by filling in the proper bubble with a #2 pencil. If you change an answer‚ erase the undesired mark thoroughly. Be sure to fill in the boxes for your student number‚ name and lab section; then correctly fill in the corresponding bubbles beneath them. A periodic table and other useful information are attached to the back
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Title : Expt.1 Determination of the enthalpy (heat) of reaction of a monobasic acid with sodium hydroxide Experiment no : 1 Experiment title : Determination of the enthalpy (heat) of reaction of a monobasic acid with sodium hydroxide Objectives: 1) To understand the enthalpy chemistry. 2) To determine the calorimeter constant. 3) To determine the enthalpy reaction of acid-base reactions. 4) To study the exothermic reaction. Apparatus and Materials : * Dewar flask
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Practice Final Exam Version 2 Name___________________________________ Chemistry 201 (Eikey) Part 1: MULTIPLE CHOICE (48 points). Choose the one alternative that best completes the statement or answers the question. Record your answer on the scantron. Each question is worth 3 points. 1) A student weighed 30.00 µg of sulfur in the lab. This is the same mass as A) 3.000 × 10 4 ng. B) 3.000 × 10 -5 mg. C) 3.000 × 10 -8 g. D) 3.000 × 10 -5 kg. 2) 1) 2) A student performs an experiment to determine
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The Brayton Cycle (Jet Engine) Purpose and Objective: The purpose and objective of this experiment is to understand the basic operation of a brayton cycle also to demonstrate the application of basic equations for Brayton cycle analysis. Technical Background: The Brayton cycle depicts the air standard model of a gas turbine power cycle and is used in all applications involving turbine engines; such as jet engines. A simple gas turbine is comprised of three
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formation standard molar enthalpy of reaction (∆Hcomb‚ ∆Hvap‚ ∆Hsol etc.) Heat flow diagram Potential Energy Diagram 2. The standard molar heat of combustion for benzene C6H6(l) is -6542 kJ/mol. a) Write a thermo chemical equation for the reaction. b) What is the enthalpy change per mole of CO2 (kJ/mol of CO2) c) Calculate the amount of heat energy released by the combustion of 100.0 g of benzene. d) Draw an enthalpy diagram for the reaction e) What mass of benzene must be combusted
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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 encompass changes by exchanging heat energy‚ either by absorbing heat or releasing it. This heat is now energy
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Investigating How the Relative Molecular Mass Changes in Heat Combustion of an Alcohol Planning Introduction ============ As alcohol burns in air it gives out energy as heat and light. I am going to investigate how the energy output of an alcohol in combustion changes‚ with increased relative molecular mass‚ or RMM. RMM is the sum of the atomic masses of every atom in the molecule. Using the alcohols: Methanol‚ Ethanol‚ Propan-1-ol‚ Butan-1-ol and Pentan-1-ol‚ I will plan
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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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= 40.7 kJ mol–1 The quantity 40.7 is known as the enthalpy of vaporization (often referred to as “heat of vaporization”) of liquid water. The following points should be kept in mind when writing thermochemical equations: • Any thermodynamic quantity such as ΔH that is associated with a thermochemical equation always refers to the number of moles of substances explicitly shown in the equation. Thus for the synthesis of water we can write 2 H2(g) + O2(g)→ 2 H2O(l) ΔH = –572 kJ or H2(g)
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CYPOP2-6.1 Plan meals for young children that meet their nutritional needs based on current government guidance and information from carers. Studies have documented that schedules and routines influence children’s emotional‚ cognitive‚ and social development. Predictable and consistent schedules in preschool classrooms help children feel secure and comfortable. Also‚ schedules and routines help children understand the expectations of the environment and reduce the frequency of behaviour problems
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