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Unformatted text preview: Version 027 Exam 1 sutcliffe (90830) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Which of these describes a chemical property? 1. Sodium is soft metal. 2. Ne is not combustible. correct 3. Copper is a solid at room temperture. 4. NO 2 is an amber-colored substance. 5. Palladium has a high boiling point. Explanation: Chemical properties always involve the change of a substance into another. If Ne were to burn, it would be converted into some other compound (some oxide of neon). The other properties described here are all physical properties. None involve a chemical change. 002 10.0 points The Bohr theory of the hydrogen atom 1. accounts for the fact that light of only cer- tain wavelengths is given off when a hydrogen atom is excited. correct 2. assumed that the three equivalent p or- bitals were at 180 to each other. 3. explains the periodicity of recurrence of chemical properties in the periodic table. 4. accounts for the fact that light of all wave- lengths is given off when an atom is excited. 5. explains the chemical bonding in terms of dot structures. Explanation: 003 10.0 points In the formula for copper(II) phosphate, how many phosphorus atoms are there? 1. one 2. four 3. three 4. two correct Explanation: The copper(II) ion is Cu 2+ ; the phosphate ion is PO 3 4 . Two PO 3 4 are needed to balance the charge on every three Cu 2+ . (This gives a total anion charge of- 6 and a total cation charge of +6.) The formula is Cu 3 (PO 4 ) 2 . 004 10.0 points Which of the following is the molecular for- mula for pentane? 1. C 3 H 8 2. C 7 H 16 3. C 6 H 14 4. C 5 H 12 correct 5. C 4 H 10 Explanation: 005 10.0 points The electron configuration 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 could represent 1. a neutral atom of Ar. 2. a Cl ion. 3. none of the ions or atoms mentioned. 4. any of the ions or atoms mentioned. cor- rect 5. a K + ion. Explanation: 006 10.0 points Version 027 Exam 1 sutcliffe (90830) 2 Gallium (atomic number 31) is in group 13 (IIIA). In addition to the s type electrons, it will have how many electrons in the 4 p energy sublevel?...
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- Summer '07