Test 2 #1 - Name: ____________________ Student number:...

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Unformatted text preview: Name: ____________________ Student number: ______________ Page 3 of 26 Version # 1 Continued on next page See page 2 of the exam for instructions. Questions 1-23 are worth two (2) marks each. 1. Which of the following is the conjugate base of H 2 PO 4 ? (A) PO 4 3 (B) HPO 4 2 (C) H 3 PO 4 (D) H 4 PO 4 + (E) OH 2. Equal sized pieces of sodium, magnesium, and cesium are placed in individual flasks containing water. Predict the order in which you think the metals would react, from most reactive to least reactive . (A) Cs > Na > Mg (B) Mg > Na > Cs (C) Mg > Cs > Na (D) Na > Cs > Mg (E) Cs > Mg > Na Name: ____________________ Student number: ______________ Page 5 of 26 Version # 1 Continued on next page 5. Which one of the following is an allowed set of quantum numbers ( n, l, m l , m s ) for an electron? (A) (2, 1, 0, 1) (B) (3, 3, 1, ) (C) (2, 1, 1, ) (D) (3, 1, 1, +) (E) (4, 1, 2, +) 6. Both X-rays and electrons can form diffraction patterns when interacting with atoms in a solid. What would be the momentum p (in kg m s 1 ) of an electron that had the same wavelength as an X-ray photon with a frequency of 1.5 10 18 Hz? (A) 3.1 10 7 (B) 3.3 10 24 (C) 2.6 10 26 (D) 1.3 10 42 (E) 3.5 10 54 Name: ____________________ Student number: ______________ Page 6 of 26 Version # 1 Continued on next page 7. A beam of light with a frequency of 5.00 x 10 14 Hz ionizes a hydrogen atom that is already in an excited state (n = 4). The electron is ejected from the atom with a certain kinetic energy. What is the kinetic energy (in J) of the ejected electron? (A) 1.95 10 19 J (B) 1.36 10 19 J (C) 1.18 10 20 J (D) 3.26 10 5 J (E) 2.18 10 18 J 8. Select the statement that is FALSE regarding the perchlorate anion, ClO 4 , and the chlorate ion, ClO 3 , when they are drawn with charge minimized Lewis structures. (A) The formal charge of Cl in both ions is 0. (B) The oxidation state of Cl in ClO 3 +5. (C) The average Cl O bond length is longer in ClO 4 than in ClO 3 . (D) The shape of the ClO 4 anion is tetrahedral. (E) The ClO 3 anion has 16 nonbonding valence electrons. Name: ____________________ Student number: ______________ Page 7 of 26 Version # 1 Continued on next page 9. Which of the following statements is/are TRUE ? (i) TeCl 4 is a non-polar molecule. (ii) TeCl 2 is a V-shaped (or bent) molecule. (iii) All of the atoms of TeCl 3 + are in the same plane. (iv) TeCl 4 has one nonbonding pair of electrons on tellurium. (A) i, ii (B) ii, iv (C) iii (D) iv (E) i, iii 10. From the following information: CoO(s) + H 2 (g) Co(s) + H 2 O(g) K 1 = 66.99 CoO(s) + CO(g) Co(s) + CO 2 (g) K 2 = 490.2 determine K c for 2 CO(g) + 2 H 2 O(g) 2 CO 2 (g) + 2 H 2 (g) (A) 3.284 10 3 (B) 7.318 (C) 53.55 (D) 0.1222 (E) 5.689 10 4 Name: ____________________ Student number: ______________ Page 8 of 26 Version # 1 Continued on next page 11. At a certain temperature, solid Ag...
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Test 2 #1 - Name: ____________________ Student number:...

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