hmwk 2 solutions

# hmwk 2 solutions - mao(tm23477 Homework 2 Bonding...

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mao (tm23477) – Homework 2: Bonding – Shear – (52375) 1 This print-out should have 24 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Use the Pauling electronegativity values from Figure 13.3 of your text book to solve any problems needing EN. In the exam a sim- ilar table will be provided. Remember that topics covered by ALEKS are not included in Quest homework topics that you particularly need to be able to do are how to draw Lewis structures, how to use VSEPR theory to pre- dict the shape and polarity of molecules, how to use VB theory to predict hybridization, and how to use MO theory to predict bond length and strength. Extra examples of these to work in addition to ALEKS will be sup- plied via quest (for no credit) as we cover them in class.. 001 10.0 points Which, if any, pair of name and formula (in- cluding charge) is INCORRECT? 1. All are correct correct 2. sulfate ion : SO 2 - 4 3. None is correct 4. nitrate ion : NO - 3 5. carbonate ion : CO 2 - 3 6. phosphate ion : PO 3 - 4 Explanation: 002 10.0 points How many grams of NH 3 can be produced from the reaction of 17.8 moles of H 2 and a sufficient supply of N 2 ? N 2 + 3 H 2 2 NH 3 1. 455 grams 2. 100.grams 3. 408 grams 4. 11.9 grams 5. 225 grams 6. 202 grams correct Explanation: ? g NH 3 = 17 . 8 moles H 2 × parenleftbigg 2 moles NH 3 3 moles H 2 parenrightbigg × 17 . 034 g NH 3 1 mole NH 3 = 202 . 137 grams 003 10.0 points When dealing with electrons in atoms and molecules, the electrons that are not consid- ered as valence electrons (can, cannot) ef- fectively shield the nucleus and thereby (de- crease, increase) the effective nuclear charge. 1. cannot; decrease 2. cannot; increase 3. can; decrease correct 4. The non-valence electrons do nothing. 5. can; increase Explanation: 004 10.0 points Electron affinity corresponds to the energy released or absorbed in which process (for atom A)? 1. None of these 2. A A + + e - 3. A A + + 2 e - 4. A 50 electron volt electron collides with A to give A + + 2 e - . 5. A + e - A - correct

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mao (tm23477) – Homework 2: Bonding – Shear – (52375) 2 Explanation: Electron affinity is defined as the amount of energy absorbed in the process in which an electron is added to a neutral isolated gaseous atom to form a gaseous ion with a - 1 charge. This is represented by the equation A + e - A - . 005 10.0 points Arrange the ions Be 2+ , F - , Mg 2+ , S 2 - , Cl - in order of increasing size. 1. Be 2+ , Mg 2+ , F - , Cl - , S 2 - correct 2. S 2 - , F - , Cl - , Mg 2+ , Be 2+ 3. F - , Be 2+ , Mg 2+ , Cl - , S 2 - 4. Be 2+ , F - , Mg 2+ , S 2 - , Cl - 5. Impossible to predict. Explanation: Ionic size increases going down the Periodic table. For an isoelectronic series of ions, the more electrons lost the smaller the ion and the more electrons gained the larger the ion.
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