Exam1Key0 (3) - 1. W hich of the following compounds...

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Unformatted text preview: 1. W hich of the following compounds exhibits primarily polar covalent bonding? (A) K 2 O (B) CaS (C) SrCl 2 (D) PF 3 (E) CsF 2. What is the stoichiometric coefficient in front of H 2 O when the reaction below is balanced with the lowest whole number coefficients? BF 3 + H 2 O B 2 O 3 + HF (A) 1 (B) 2 (C) 3 (D) 4 (E) 6 3. What is the pH of a 0.20M HCl solution? (A) <0 (B) 0.70 (C) 1.61 (D) 12.39 (E) 13.30 4. Lithium forms compounds which are used in dry cells and storage batteries and in high-temperature lubricants. It has two naturally occurring isotopes, 6 Li (isotopic mass = 6.015121 amu) and 7 Li (isotopic mass = 7.016003 amu.) Lithium has an atomic mass of 6.9409 amu. What is the percent abundance of lithium-6? (A) 6.080 % (B) 7.503 % (C) 46.16 % (D) 86.66 % (E) 92.50 % 5. How many grams of calcium phosphate are needed to form 172 g of calcium silicate? 2Ca 3 (PO 4 ) 2 + 6SiO 2 + 10C 6CaSiO 3 + P 4 + 10CO (A) 21.5 g (B) 57.3 g (C) 153 g (D) 516 g (E) 1.38 x 10 3 g 6. What is the energy in Joules of a photon with a wavelength of 488.0 nm? (c = 2.998 x 10 8 m/s, h = 6.626 x 10-34 Js ) (A) 4.07 x 10-28 J (B) 4.07 x 10-19 J (C) 1.08 x 10-58 J (D) 3.23 x 10-31 J (E) 9.69 x 10-32 J 7. Which of the following is a correct set of quantum numbers for an electron in a 4p orbital?...
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Exam1Key0 (3) - 1. W hich of the following compounds...

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