cooling curve for water at 1 atm pressure. (Note: CI = heat capacity of water in region I‚ T = change in temperature between points specified‚ Hfus = heat of fusion.) Which of the following statements is/are true? I. No heat energy is being added or removed from the system between points B and C II. The quantity of heat being removed from the system between points C and D is equal to CIII x m x t(C and D) III. The quantity of heat being added to the system between points C and D is equal
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and Types of Energy Energy – is the capacity to do work or to transfer heats. Forms of Energy 1. Kinetic energy 2. Radiant energy 3. Thermal energy 4. Chemical energy 5. Potential energy Energy Changes in Chemical Reactions Heat – is the transfer of thermal energy between two bodies that are at different temperature. Thermochemistry – is the study of heat change in chemical reactions. Terms: System –
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account for the loss of oxygen gas upon heating (Equations 1-3). Note that equations 1-3 are not balanced. Equation 1 2NaClO3(s) → 2NaClO2(s) + O2(g) Equation 2 NaClO3(s) → NaClO(s) + O2(g) Equation 3 2NaClO3(s) → 2NaCl(s) + 3O2(g) What is the actual chemical equation for the thermal decomposition of sodium chlorate? All of the possible sodium-containing products n Equations 1-2 are real compounds: sodium chlorite‚ NaClO2; sodium hypochlorite‚ NaClO; and sodium chloride
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Chapter 6 Chemical Reactions and Quantities The Mole General‚ Organic‚ and Biological Chemistry Copyright © 2010 Pearson Education‚ Inc. 1 Collection Terms A collection term states a specific number of items. 1 dozen donuts = 12 donuts 1 ream of paper = 500 sheets 1 case = 24 cans General‚ Organic‚ and Biological Chemistry 2 A Mole of Atoms A mole is a collection that contains the same number of particles as there are carbon atoms in 12.0 g of carbon 12C 6.02 x 1023 atoms of
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water vapor D.energy E.none of the above Answer Key: D Feedback: the characteristics of matter are discussed in chapter 3 Question 7 of 22 2.0/ 2.0 Points `If I apply 0.0385 kJ of heat to 0.0175 kg of an unkown metal‚ and I am able to raise its temperature from 27.0 °C to 30.0 °C‚ what is its specific heat? (Pay attention to units in this problem) A.0.73 J/g∙°C B.4.18 J/g∙°C C.0.15 J/g∙°C D.1.4 J/g∙°C E.none of the
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displacement‚ combustion and neutralization). Synthesis reactions occur when multiple reactants combine to produce a product (i.e. 2H2 (g) + O2 (g) 2H2O (l)). Decomposition reactions occur when a single reactant breaks down into multiple products (i.e. 2KCl (S) 2K (s) + Cl2 (g)). Single displacement reactions occur when one more active element kicks out or displaces another less active element in a compound (i.e. Zn (s) + CuSO4 (aq) ZnSO4 (aq) + Cu (s)). Double displacement are similar to single displacement
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metals. Have different physical properties. Metals: Have high melting and boiling points‚ have metal “shine”‚ high densities and are good conductors of electricity and heat. Non-metals: Majority have low melting and boiling points (except Carbon (C)‚ Phosphorous (P)‚ Sulphur (S)). They have low densities and do not conduct heat or electricity (except carbon as graphite). Molecules E.g. of molecules: Hydrogen H2‚ Water H2O‚ Oxygen O2‚ Carbon dioxide CO2‚ Glucose C6H12O6‚ Ethanol C2H5OH All
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energy released than when bonds are made than broken than with methane 5. Calculate the enthalpy change from an experiment in kJmol-1. a. e.g. the temp of 100g of water rose by 12 degrees C when 1g of methanol was completely combusted. The specific heat capacity of water is 4.2 Jg-1K-1 ∆H = - 100 X 4.2 X 12 / 1/32 (/ moles methanol) then / 1000 = - 161 kJ mol-1 6. State Hess’s law and use a Hess’s law cycle to find ΔHθf of CH4 if given the ΔHθc of C ‚ ΔHθcH2.and ΔHθc
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Determining the enthalpy change for the thermal decomposition of potassium hydrogen carbonate into potassium carbonate. Controlled Variables: 1. Volume of HCl ± 0.5 cm3 (± 2%) 2. Concentration of HCl‚ 3. Same mass of K2CO3 and KHCO3 within specified ranges of 2.5 – 3.0g and 3.25 – 3.75g respectively 4. Same calorimeter used i.e. polystyrene cup is used in this experiment 5. Same thermometer will be used ± 0.10K 6. Same source of K2CO3‚ KHCO3 and HCl Raw Data Results: The raw
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Numerical Analysis of Auto-ignition of Ethanol Vaibhav Kumar Sahu1‚ Shrikrishna Deshpande1‚ Vasudevan Raghavan1‚* 1Department of Mechanical Engineering Indian Institute of Technology Madras‚ Chennai 600036‚ INDIA. Received 28 June 2011; accepted 5 August 2011‚ available online 24 August 2011 1. Introduction Ethanol is the most effective bio-fuel. Its easier production from agricultural feed-stocks‚ sugar cane and Fischer-Tropsch method makes it dominant among other bio-derived
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