PracticeExam-Final - CHM 2045C Name_ Final Exam Review...

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CHM 2045C Final Exam Review Name___________________________________ Choose the one alternative that best completes the statement or answers the question. 1) An 56 Fe 2 + particle contains A) 54 protons, 56 neutrons and 52 electrons. B) 28 protons, 28 neutrons and 26 electrons. C) 58 protons, 58 neutrons and 56 electrons. D) 26 protons, 30 neutrons and 24 electrons. 2) How much energy is evolved during the reaction of 48.7 g of Al, according to the reaction below? Assume that there is excess Fe 2 O 3 . Fe 2 O 3 (s) + 2 Al(s) ± Al 2 O 3 (s) + 2 Fe(s) rxn = - 852 kJ A) 415 kJ B) 207 kJ C) 769 kJ D) 241 kJ 3) When stopcock A of the open - end manometer shown below is opened, which drawing best represents the result? A) drawing (1) B) drawing (2) C) drawing (3) D) drawing (4) 4) A block of wood has dimensions of 1.2 m × 5.0 cm × 7.0 cm and has a mass of 3.0 kg. What is the density of the wood? A) 0.071 g/mL B) 1400 g/mL C) 1.4 g/mL D) 0.71 g/mL 1
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5) Use the given average bond dissociation energies, D , to estimate ̇ H for the reaction of methane, CH 4 ( g ), with fluorine according to the equation: CH 4 ( g ) + 2 F 2 ( g ) ± CF 4 ( g ) + 2 H 2 ( g ) Bond D , kJ/mol C N F 450 C N H 410 F N F 158 H N H 436 A) - 318 kJ B) + 318 kJ C) + 716 kJ D) - 716 kJ 6) Atoms of which element, indicated by letter on the periodic table, are expected to have the largest atomic radius? A) A B) B C) C D) D 7) The central atom in __________ does not violate the octet rule. A) CF 4 B) SF 4 C) XeF 4 D) KrF 2 8) Which of the following statements are TRUE? A) An orbital is the path that an electron follows during its movement in an atom. B) The angular momentum quantum number ( l ) describes the the size and energy associated with an orbital. C) The principal quantum number ( n ) describes the shape of an orbital. D) The magnetic quantum number ( m l ) describes the orientation of the orbital. 9) The volume of 350. mL of gas at 25°C is decreased to 125 mL at constant pressure. What is the final temperature of the gas? A) 8.9°C B) 561°C C) 70°C D) - 167°C 2
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10) Consider the molecule below. Determine the hybridization at each of the 2 labeled carbons. A) C1 = sp 2 , C2 = sp 3 B) C1 = sp 3 d, C2 = sp 3 d 2 C) C1 = sp 2 , C2 = sp 3 d D) C1 = sp 3 , C2 = sp 3 d 11) Calculate the wavelength (in nm) of a the red light emitted by a neon sign with a frequency of 4.74 × 10 14 Hz. A) 704 nm B) 158 nm C) 633 nm D) 466 nm 12) Write out the orbital diagram that represents the ground state of As. How many unpaired electrons are there? A) 4 B) 1 C) 3 D) 0 13) If NO and NH 3 are allowed to effuse through a porous membrane under identical conditions, the rate of effusion for NH 3 will be ________ times that of NO . A) 1.3
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This note was uploaded on 10/21/2010 for the course CHM 2046 taught by Professor Dixon during the Spring '08 term at University of Central Florida.

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PracticeExam-Final - CHM 2045C Name_ Final Exam Review...

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