hw4a - Thomas, Phillip Homework 4 Due: Oct 2 2007, 11:00 pm...

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Thomas, Phillip – Homework 4 – Due: Oct 2 2007, 11:00 pm – Inst: Brodbelt 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. The due time is Central time. Brodbelt CH301 Homework 4 Chapter 13-I Due October 2 at 11:00 pm 001 (part 1 oF 1) 10 points What characteristics do atoms oF carbon-12, carbon-13, and carbon-14 have in common? 1. same number oF neutrons and protons 2. same mass 3. same number oF electrons 4. same number oF neutrons and electrons 5. same number oF protons and electrons correct 6. same number oF neutrons 7. same number oF protons Explanation: 12 C, 13 C, and 14 C all have 6 protons and 6 electrons. 12 C has 6 neutrons, 13 C has 7 neutrons, and 14 C has 8 neutrons. 002 (part 1 oF 1) 10 points The chemistry oF an element is largely deter- mined by 1. its relative abundance. 2. its number oF total electrons. 3. its core electrons. 4. its valence electrons. correct 5. its mass. Explanation: The chemistry oF an element is largely de- termined by its valence electrons. 003 (part 1 oF 1) 10 points The oxygen 1 - anion O - has how many total electrons and how many valence electrons? 1. 9; 7 correct 2. 8; 6 3. 7; 6 4. 8; 9 5. 9; 9 6. 8; 8 7. 8; 7 8. 7; 5 9. 9; 8 Explanation: A standard oxygen atom has 8 total elec- trons. The negative charge indicates that the atom has gained one more electron giving the ion 9 total electrons. The valence electrons are those in the out- ermost s and p orbitals. ±or oxygen, this would be in the second principal level where it has 2 s electrons and 5 p electrons, so O - has 7 electrons in its valence. 004 (part 1 oF 1) 10 points Describe the Lewis dot structure For Cl + . 1. three pairs oF electrons 2. three pairs oF electrons, one lone electron 3. one pair oF electrons, three lone electrons 4. two pairs oF electrons, one lone electron 5. one pair oF electrons, two lone electrons 6. two pairs oF electrons, three lone elec- trons
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Thomas, Phillip – Homework 4 – Due: Oct 2 2007, 11:00 pm – Inst: Brodbelt 2 7. two pairs of electrons, two lone electrons correct Explanation: Cl + has lost an electron giving it a total of 6 valence electrons. Two are paired as they
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This note was uploaded on 06/07/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas at Austin.

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hw4a - Thomas, Phillip Homework 4 Due: Oct 2 2007, 11:00 pm...

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