Ch 301 Final - Version Final Sutcliffe ( 1 This print-out...

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Unformatted text preview: Version Final Sutcliffe ( 1 This print-out should have 45 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Which of these name/symbol combinations is incorrect? 1. boron : B 2. nickel : Ni 3. arsenic : As 4. potassium : P correct 5. silicon : Si Explanation: The symbol for potassium is K. 002 10.0 points A 0 . 113 g sample of a gas exerts a pressure of 780 torr in a 50 . 4 mL container at 23 C. What is the molar mass of this gas? 1. 96.4 g/mol 2. 65.3 g/mol 3. 53.1 g/mol correct 4. 34.6 g/mol 5. 242. g/mol Explanation: V = 50 . 4 mL = 0 . 0504 L T = 23 C + 273 = 296 . 15 K P = 780 torr 1 atm 760 torr = 1 . 02632 atm m = 0 . 113 g Applying the ideal gas law equation, P V = nRT n = P V RT = (1 . 02632 atm) (0 . 0504 L) 296 . 15 K parenleftbigg mol K . 08206 L atm parenrightbigg = 0 . 00212847 mol MW = . 113 g . 00212847 mol = 53 . 0897 g / mol 003 10.0 points Which molecule would you expect to have the largest value for the van der Waals constant b? 1. NH 3 2. Ne 3. He 4. PH 3 correct Explanation: 004 10.0 points According to the Second Law of Thermody- namics, for any spontaneous process 1. The entropy of the system will decrease. 2. The entropy of the system will increase. 3. The entropy of the universe will tend toward zero. 4. The total entropy of the combined system and surroundings will increase. correct 5. Heat will be released into the surround- ings increasing the entropy of the surround- ings. Explanation: The Second Law States that for a sponta- neous process the total entropy of the sys- tem and the surroundings combined (which is S univ ) must increase. 005 10.0 points An electron in a 3 d orbital could have which of the following quantum numbers? 1. n = 2; = 2; m = 6 Version Final Sutcliffe 2 2. n = 3; = 0; m = 0 3. n = 3; = 1; m = 2 4. n = 3; = 2; m = 0 correct 5. n = 3; = 1; m =- 1 6. n = 3; = 3; m = 1 7. n = 3; = 2; m =- 3 Explanation: 3 refers to the principal quantum number n . d corresponds to the subsidiary quantum number = 2. Since = 2, m could be- 2 ,- 1 , , 1 or 2. 006 10.0 points Of the following combinations of compounds : names, which one is incorrect? 1. MgS : magnesium sulfide 2. BF 3 : boron trifluoride 3. Li 2 O : dilithium oxide correct 4. P 2 Cl 4 : diphosphorous tetrachloride 5. MgCl 2 : magnesium chloride Explanation: Prefixes such as di, tri-, etc. are used when more than one compound can be made from the elements involved. This commonly hap- pens when two or more nonmetals form a compound. Hence prefixes are used for boron trifluoride and diphosphorous tetrachloride....
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Ch 301 Final - Version Final Sutcliffe ( 1 This print-out...

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