Sample Test 2

Sample Test 2 - CHEM 101 SAMPLE EXAM: items in BOLD...

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CHEM 101 SAMPLE EXAM: items in BOLD characters are the ANSWERS. If I were you, i’ll answer first before looking at the answers. 1) For which of the following equations is the enthalpy change at 25¯C and 1 atm pressure equal to Hf for CH3OH(l)? @ CO(g) + 2 H2(g) ---> CH3OH(l) C(g) + 4 H(g) + O(g) ---> CH3OH(l) C(graphite) + H2O(g) + H2(g) ---> CH3OH(l) C(graphite) + 2 H2(g) + 1/2 O2(g) ---> CH3OH(l) C(graphite) + 2 H2(g) + O(g) ---> CH3OH(l) 2) In a simple process, a system does 125 J of work on its surroundings, while 75 J of heat is added to the system. What is the internal energy change, E, for the system? @ +50. J -50. J +200. J -200. J +75 J 3) How much heat is required to raise the temperature of a 162 g piece of copper by 74.1¯C? The molar heat capacity of copper is 25 J/¯C-mol. @ 170 kJ 3.0E2 kJ 22 kJ 1400 kJ 4.7 kJ 4) When 3.00 g of carbon (in the form of graphite) is burned in excess oxygen at 25¯C, 98.3 kJ of heat is released. What is Hf (kJ/mol) of CO2 gas? @ +98.3 -98.3 +394 -394 -295 5) What is the correct electronic configuration and the number of unpaired electrons for the ground state of Fe ? @ [Ar], 4s2, 3d6, 6 unpaired electrons [Ar], 3d6, 4 unpaired electrons
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[Ar], 4s2, 4p6, 0 unpaired electrons [Ar], 4s2, 3d6, 4 unpaired electrons [Kr], 4s2, 3d6, 1 unpaired electron 6) What is the maximum number of electrons that can occupy orbitals with n = 4 in a single atom? @ 10 2 18 50 32 7) When cesium reacts with water, the final products are: @ CsOH(aq), H2(g) Cs(OH)2(aq), H2(g) CsH(s), O2(g) CsH2(s), O2(g) Cs2O(s), H2(g)
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This test prep was uploaded on 04/17/2008 for the course CHE 101 taught by Professor Churchhill during the Spring '08 term at SUNY Buffalo.

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Sample Test 2 - CHEM 101 SAMPLE EXAM: items in BOLD...

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