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HWK4 - Valenica Daniel Homework 4 Due Oct 2 2007 11:00 pm...

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Valenica, Daniel – 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 – find 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 electrons 2. same number of neutrons and electrons 3. same number of neutrons and protons 4. same number of protons and electrons correct 5. same number of neutrons 6. same number of protons 7. same mass 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 number of total electrons. 2. its relative abundance. 3. its core electrons. 4. its mass. 5. its valence electrons. correct 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. 8; 7 2. 7; 6 3. 7; 5 4. 8; 9 5. 9; 7 correct 6. 8; 8 7. 9; 8 8. 9; 9 9. 8; 6 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. For 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. two pairs of electrons, three lone elec- trons 2. two pairs of electrons, one lone electron 3. three pairs of electrons 4. one pair of electrons, three lone electrons 5. one pair of electrons, two lone electrons 6. three pairs of electrons, one lone electron
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Valenica, Daniel – 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 would in the s -orbital.
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