sample exam 1 solutions

sample exam 1 solutions - Version 141 Exam One: Shear Shear...

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Unformatted text preview: Version 141 Exam One: Shear Shear (52375) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points The number of unpaired electrons in a neutral atom of titanium (Ti) is 1. 2. correct 2. 1. 3. 4. 4. none 5. 3. Explanation: Titaniums electronic configuration is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 2 All of the orbitals before 3 d are completely filled, so no unpaired electrons exist in them. However, within 3 d , only 2 electrons occupy the 5 available orbitals. These 2 electrons occupy different orbitals (according to Hunds Rule), so there are only 2 unpaired electrons in titanium. 002 10.0 points If a particle is in a one-dimensional box and is in its ground state, where would you MOST probably find the particle? 1. at the two ends of the box 2. in the center of the box correct 3. either side of the center of the box 4. anywhere in the box Explanation: 003 10.0 points Which quantum number is most important in determining the type, or shape of atomic orbitals? What would be its value for a 5 p orbital? 1. , = 5 2. n, n = 5 3. n, n = 1 4. m , m = 1 5. m , m = 2 6. , = 1 correct Explanation: 004 10.0 points Give the set of quantum numbers of a 3 p electron. 1. n = 3, = 2 2. n = 2, =- 1 , , +1 3. n = 3, = 3 4. n = 3, = 1 correct 5. n = 3, = 0 Explanation: The 3 refers to n = 3 and the p refers to = 1. 005 10.0 points A neutral isolated atom has a ground state configuration of 1 s 2 2 s 2 2 p 6 3 s 2 3 p 3 . Identify the element. 1. The question cannot be answered unless the atomic weight is known. 2. cobalt (Co) 3. argon (Ar) 4. vanadium (V) 5. phosphorus (P) correct Explanation: Version 141 Exam One: Shear Shear (52375) 2 006 12.0 points When the reaction P 4 O 10 + KOH K 3 PO 4 + H 2 O is balanced, how much KOH is required to react with 3 moles of P 4 O 10 ? 1. 9 mol 2. 27 mol 3. 3 mol 4. 36 mol correct 5. 18 mol Explanation: n P 4 O 10 = 3.0 mol The balanced chemical equation for this reaction is P 4 O 10 + 12 KOH 4 K 3 PO 4 + 6 H 2 O . From the coefficients we see that 12 mol KOH are required for each mole of P 4 O 10 reacted. We use this ratio to calculate the moles of KOH required to react 3 mol P 4 O 10 : ? mol KOH = 3 mol P 4 O 10 12 mol KOH 1 mol P 4 O 10 = 36 mol KOH 007 10.0 points The transition metals are elements with par- tially filled 1. s subshells. 2. f subshells. 3. d subshells. correct 4. p subshells. Explanation: In transition metals, d orbitals are being filled. 008 15.0 points DrRuth says: Select the answer closest to your calculated answer....
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sample exam 1 solutions - Version 141 Exam One: Shear Shear...

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