[CHM113] 113TApe2sp08

# [CHM113] 113TApe2sp08 - TA Practice Exam 2 CHM 113 1 An...

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1 TA Practice Exam 2 CHM 113 1. An exothermic reaction is allowed to take place in a sealed and thermally isolated “system”. Temperature recordings show an increase from an initial temperature of 26 °C to a final temperature of 74 °C over the course of the reaction. The mass of the system (reactants and products) is 285 grams and the specific heat of the system is = 3.2 J/g°C. How much heat was produced? a. 4.3kJ b. 4.2kJ c. 44kJ d. 43kJ 2. Consider the following electron box diagram for a neutral element: 1s 2s 2p 3s 3p Which of the following processes may have occurred? a. Chlorine has absorbed light at a wavelength corresponding to the energy gap between the 3s and 3p sublevels b. Fluorine has absorbed light at a wavelength corresponding to the energy gap between the 2p and 3p sublevels c. Argon has absorbed light at a wavelength corresponding to the energy gap between the 3s and 3p sublevels d. No process has occurred, this is the normal electron box diagram for Chlorine e. No process has occurred, this is the normal electron box diagram for Argon 3. Which expression represents work being done by the system on the surroundings? a. –q b. –w c. +q d. +w

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2 4. Here is some thermodynamics data describing two reactions. CO (g) ! C (s) + ! O 2 (g) " H 1 = 110.5 kJ CO (g) + ! O 2 (g) ! CO 2 (g) " H 2 = -283 kJ Given this data, determine the enthalpy change " H Rxn for the formation of carbon dioxide gas from elemental carbon and oxygen? a. -173 kJ b. -394 kJ c. -504 kJ d. -62 kJ 5. Which one of these is not a state function? a. " H b. " E c. q d. all are state functions 6. If the " H for a reaction is 30 kJ, and the pressure-volume work ( P " V) is equal to 20 kJ, then what will be the internal energy change for the reaction? a. -10 kJ b. 10 kJ c. 50 kJ d. 50 kJ 7. What is the resulting concentration when 45 mL of 3.4 M H 2 SO 4 is diluted to 2.2 L? a. 0.070M b. 0.16M c. 1.7x10 2 M d. 70M 8. What will be the final temperature of 2.55 kg of water, if it absorbs 280 kJ of heat energy? The initial temperature of the water is 5 °C. The specific heat of water is 4.184 J/(g°C) a. 26 °C b. 31 °C c. 36 °C d. 41 °C
3 9. Consider the following reaction: Cu(NO 3 ) 2 (aq) + Mg (s) # Mg(NO 3 ) 2 (aq) + Cu (s) Which of the following statements is true? a. Cu is reduced b. Mg is going from a +2 to 0 oxidation state c. The reaction proceeds because Cu is “more active” than Mg d. It is classified as a double replacement reaction e. None of the above 10. Which of the following reactions is considered a neutralization reaction? a. The reaction between halogen with an alkali metal b. The reaction between H 2 O and KH c. The reaction between a chalcogen and a nonmetal d. The reaction of H 3 PO 4 with KOH e. None of the above 11. A 23.5 ml aliquot of NaOH of unknown concentration was titrated with 0.019 M hydrochloric acid. If it took 28.5 ml of HCl to reach the endpoint of the titration, what is the concentration of the NaOH? a.

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[CHM113] 113TApe2sp08 - TA Practice Exam 2 CHM 113 1 An...

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