chemexam2solutions - Livasy, David Homework 3 Due: Sep 24...

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Unformatted text preview: 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 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. 2Ca + , F 2- 4. Ca + , F - 5. 3Ca 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....
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chemexam2solutions - Livasy, David Homework 3 Due: Sep 24...

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