[CHM113] 113TApe3sp08

[CHM113] 113TApe3sp08 - Exam #3 TA Practice Exam 1)...

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Exam #3 TA Practice Exam
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1) According to Z eff = Z – S, a valence electron in Na is expected to experience a +1 charge from the nucleus. However, the actual Z eff is closer to 2.5. Which of the following statements best describes this discrepancy ? (a) The valence shell of Na only contains one electron. (b) The 10 core electrons effectively shield the valence electrons. (c) 3s electron has a small probability of being found close to the nucleus and inside the core electrons (d) Actual Z eff is not greater than calculated Z eff . (e) a and b. 2) What is the trend for electronegativity as we move across a period( left-right) and a group (top-bottom)? a) increases, decreases b) increases, increases c) decreases, increases d) remains constant, decreases e) increases, remains constant 3) Which metal in group IA has the highest electro negativity? a) H b) Na c) Li d) Fr e) K 4) Which of the following is the most reactive with water? a) Li b) Na c) K d) Rb e) Cs
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5) Which of the following statements is true for metals? a) They tend to form anions in solution. b) They are poor conductors of heat and electricity. c) They are not lustrous. d) Their oxides are basic in solution. e) They tend to form molecular solids. 6) The first four ionization energies of Al are as follows: IE 1 = 578 kJ/mol, IE 2 = 1817 kJ/mol, IE 3 = 2745 kJ/mol, IE 4 = 11,577 kJ/mol. Which of the statements below best explains why is IE 4 so much greater than the first three ionization energies? (a) The 4 th electron in Al is a core electron, which is more difficult to remove (b) The 4 th electron in Al is a valence electron, which is more difficult to remove (c) Al holds its electrons very well (d) Outermost electrons in Al are partially shielded from protons in nucleus (e) b and c. 7) Which of the following has the largest size? a) Li b) Na c) Cl d) Fr e) Anything! 8) What is the term associated with different forms of the same element existing in same state? (a) Amphoteric (b) Isotope (c) Halotrope (d) Allotrope (e) Heliotrope
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9) A certain element is a yellow-green gas with highly negative electron affinity and very useful in industry. Which of the followings is most likely to be this element? (a)
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[CHM113] 113TApe3sp08 - Exam #3 TA Practice Exam 1)...

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