chemexam2solutions - Livasy David Homework 3 Due 11:00 pm...

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Livasy, David – Homework 3 – Due: Sep 24 2006, 11:00 pm – Inst: Donna C Lyon 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. This HW assignment is due Sunday, September 24, by 11:00 PM. 001 (part 1 of 1) 10 points Write the electron-dot notation for the ele- ment P. 1. P correct 2. P 3. P 4. P 5. P 6. P 7. P 8. P 9. None of these Explanation: electron-dot notation for P = ? According to its electron configuration ([Ne] 3 s 2 3 p 3 ), P has 2 + 3 = 5 valence elec- trons. The electron-dot notation for P is therefore P 002 (part 1 of 1) 10 points Which property is characteristic of covalent but NOT ionic compounds? 1. conductor of electricity in molten state 2. insoluble in non-polar solvents 3. aqueous solutions are poor electrical con- ductors correct 4. Aqueous solutions are good electrical con- ductors. 5. solids with a high melting point 6. formed from elements of quite different electronegativities 7. soluble in polar solvents such as water Explanation: Ionic compounds generally have high melt- ing points and covalent compounds generally have low melting points. 003 (part 1 of 1) 10 points Which property is characteristic of ionic but NOT of covalent compounds? 1. high melting point correct 2. low boiling point 3. soft, non-crystalline structure 4. non-conductor of electricity in molten state 5. easily vaporizes Explanation: 004 (part 1 of 1) 10 points Ionic compounds involve a (share, transfer) of electrons and typically involve atoms that have (large, similar, very different) electroneg- ativities. 1. transfer; similar 2. share; very different 3. transfer; large 4. transfer; very different correct 5. share; similar Explanation: Ionic compounds form as a result of a trans- fer of an electron from one atom to another. The larger the difference in electronegativities
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Livasy, David – Homework 3 – Due: Sep 24 2006, 11:00 pm – Inst: Donna C Lyon 2 between the atoms involved, the more ionic the bond is. Bonds between atoms where the difference in electronegativities is greater than 1 are considered ionic. 005 (part 1 of 1) 10 points How many valence electrons does Ni have? 1. 10 correct 2. 8 3. 7 4. 3 5. 2 6. 5 7. 6 8. 4 Explanation: 006 (part 1 of 1) 10 points Which of the following is the best represen- tation of the compound calcium fluoride? 1. Ca 2+ , 2 F - correct 2. Ca 2+ , F 2 - 3. 2 Ca + , F 2 - 4. Ca + , F - 5. 3 Ca 2+ , 2 F 3 - 6. None is appropriate because calcium flu- oride is a covalent compound. Explanation: 007 (part 1 of 1) 10 points The electronegativity of an atom generally ? going down columns and ? going left to right across rows. An element like fluorine would most likely form a(n) ? bond with an element like oxygen. 1. increases; increases; covalent 2. decreases; increases; covalent correct 3. decreases; decreases; covalent 4. increases; decreases; covalent 5. increases; decreases; ionic 6. decreases; decreases; ionic 7. increases; increases; ionic 8. decreases; increases; ionic Explanation: 008 (part 1 of 1) 10 points Which of the following is the best description of covalent bonding?
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