ex1A06-post - Chem 12 Exam 1 February 8 2006 Form A-1 Which...

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1 Chem 12, Exam 1 February 8, 2006 Form A --------------------------------------------------------------------------------------------------------------------- 1. Which of the following ionic solids has the largest lattice energy? A. SrO B. LiCl C. KCl D. RbCl E. BaO --------------------------------------------------------------------------------------------------------------------- 2. For an unknown element, I 3 = 1.5 × I 2 and I 4 = 4.2 × I 3 , where I n ’s are the consecutive ionization energies. Which of the following can be the unknown element? A. sodium B. aluminum C. chlorine D. silicon E. neon --------------------------------------------------------------------------------------------------------------------- 3. Which of the following statements is/are true ? I. All orbitals of a given subshell have the same energy only in a hydrogen atom. II. The electrons of an atom, while making up only a small fraction of the total mass, occupy the majority of the atom’s volume. III. Isotopes of an element contain the same number of neutrons, but have different atomic masses. IV. Electrons in a 2p orbital of an atom or ion experience larger effective charge than electrons in a 2s orbital of the same atom or ion. A. I only B. II only C. I and II only D. II and III only E. III and IV only --------------------------------------------------------------------------------------------------------------------- 4. A mug of hot coffee is poured, and then accidentally left on the counter for several hours by an absentminded professor. If we consider the liquid (coffee) in the mug to be the system, which of the following statements is true? A. for the system, q = 0 B. for the system, w > 0 C. for the system, q > 0 D. for the system, H > 0 E. for the system, E < 0 -------------------------------------------------------------------------------------------------------------------- 2 --------------------------------------------------------------------------------------------------------------------- 5. In a photochemical process a hydrogen atom absorbs a 434 nm photon and shortly thereafter it emits a 1282 nm photon. What is E of this process for a system composed of one mole of such hydrogen atoms? A. 848 kJ B. 182 kJ C. –2.95 kJ D. –182 kJ E. –848 kJ --------------------------------------------------------------------------------------------------------------------- 6. An element has only two isotopes with masses different by 2 amu. The abundance of the lighter isotope is 50.0%. If the atomic weight of the element is reported to be A amu, what is the mass of the lighter isotope? A.
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This note was uploaded on 05/24/2009 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Penn State.

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ex1A06-post - Chem 12 Exam 1 February 8 2006 Form A-1 Which...

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