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Explain three examples that will significantly improve the accuracy of a calorimetry lab experiment.

|The specific energy and density of gasoline is -47.3 MJ/kg and 716 kg/m³, respectively. What is its energy density? a. 0.066 mJ/m³ b. 33,867 MJ/m³ c. 0.066 m³/MJ d. 33,867 m³/MJ

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ORT SHEET Heat of Neutralization EXPERIMENT elemsboomfchg lom 12 A. Heat Capacity of Calorimeter 1. Temp. of calorimeter and water before mixing 2. Temp. of warm water °C 22.0 39,0 30.3 3. Maximum temp. determined from your curve °C 4. Heat lost by warm water (temp decrease x °C 50.0 g x 4.184 J/K-g) = 02), 5. Heat gained by cooler water (temp. increase x 50.0 g x 4.184 J/K-g) = 30,3 22.0)x 13626J s0.0gmpi S0.0gy 6. Heat gained by the calorimeter [(4) – (5)] = 7. Heat capacity of calorimeter: heat gained by the calorimeter temperature increase J/K 3. Heat of Neutralization of HCl-NaOH 22.2 22.2. °C . Temp. of calorimeter and NaOH Temp. of HCI AT determined from your curve after adding HC1 °C to the NaOH Heat gained by solution (temperature increase x ON 100 g x 4.184 J/K-g) = 9977.8J %3D Heat gained by calorimeter (temperature increase x heat capacity of calorimeter) = J %3D Total joules released by reaction [(3) + (4)] = Tight O 2018 Pearson Education, Inc.

Exothermic Endothermic Heat Heat Hotter than wOundings Heat Heat Heat Which statement is correct? O When an endothermic process takes place in the system, the entropy of the surroundings increases. O When an endothermic process takes place in the system, the entropy of the surroundings decreases. O When an endothermic process takes place in the system, the entropy of the surroundings does not change. O When an endothermic process takes place in the system, the entropy of the surroundings may increase or decrease.

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6. An enthalpy change is a. the difference in the kinetic energy of the reactants and the products in a chemical change b. the difference in the potential energy of the reactants and the products in a chemical change c. the difference in enthalpies of the reactants and the products in a chemical change d. the sum of the potential and kinetic energies of the products e. the sum of the potential and kinetic energies of the reactants 7. Which statement concerning the Law of Conservation of Energy is not true? a. it applies to all chemical changes b. it involves all different forms of energy c. it applies to nuclear reactions d. it includes potential energy e. it involves heat content of substances

21. Which device to nutritionists use to determine the number of calories in samples of food? a foam cup filled with water a bomb calorimeter a spectrometer a constant pressure calorimeter

9. Determine the amount of heat released when 5.0 g of ethane(C₂H6) are combusted. (AH comb. =-1423 kJ/mol) A. 284.6 kJ B. 236.5 kJ C. 7115 kJ D. 1423 kJ