hw3 - Killough, Ian Homework 3 Due: Sep 24 2006, 11:00 pm...

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Unformatted text preview: Killough, Ian 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 2. P 3. None of these 4. P 5. P 6. P correct 7. P 8. P 9. P 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. solids with a high melting point 2. soluble in polar solvents such as water 3. conductor of electricity in molten state 4. formed from elements of quite different electronegativities 5. Aqueous solutions are good electrical con- ductors. 6. insoluble in non-polar solvents 7. many are soluble in nonpolar solvents correct 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. non-conductor of electricity in molten state 2. soft, non-crystalline structure 3. high melting point correct 4. low boiling point 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. share; similar 2. transfer; similar 3. transfer; large 4. share; very different 5. transfer; very different correct Explanation: Ionic compounds form as a result of a trans- fer of an electron from one atom to another. Killough, Ian Homework 3 Due: Sep 24 2006, 11:00 pm Inst: Donna C Lyon 2 The larger the difference in electronegativities 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 B have? 1. 10 2. 7 3. 2 4. 8 5. 3 correct 6. 4 7. 6 8. 5 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. None is appropriate because calcium flu- oride is a covalent compound. 5. 3Ca 2+ , 2 F 3- 6. Ca + , F - 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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hw3 - Killough, Ian Homework 3 Due: Sep 24 2006, 11:00 pm...

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