ch06 - padilla (tp5647) – HW06: Bonding Part II – shear...

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Unformatted text preview: padilla (tp5647) – HW06: Bonding Part II – shear – (52375) 1 This print-out should have 26 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points How many valence electrons are in a O atom? 1. 4 2. 8 3. 6 correct 4. 16 5. 2 Explanation: Valence electrons are electrons that are found in the outermost energy levels of an atom. For O, Atomic number : 8 Electronic configuration : [He] 2 s 2 2 p 4 Shell Structure : 2- 6 Therefore, O has 6 valence electrons. 002 10.0 points Which of the following species has 5 valence electrons? 1. As correct 2. B 3. Mn 4. F 5. Ne Explanation: Valence electrons are the electrons in the outermost s and p orbitals. 003 10.0 points In a Lewis formula the dots represent 1. however many electrons are needed to satisfy the octet rule. 2. all the electrons in the atoms. 3. the valence electrons in all the atoms. correct 4. only the electrons that are being trans- ferred or shared. Explanation: 004 10.0 points The correct Lewis electron dot representa- tion for Si is 1. Si b b b b b 2. Si b b b b correct 3. Si b b b 4. Si b b b b b b 5. Si b b b b b b b 6. Si b b 7. Si b b b b b b b b 8. Si b Explanation: The number of dots in the Lewis electron dot representation of an atom is equal to the number of valence electrons of the atom. For Si, Atomic number : 14 Electronic configuration : [Ne] 3 s 2 3 p 2 Shell Structure : 2- 8- 4 Valence Electrons : 4 Therefore, its Lewis dot representation is Si b b b b , and it belongs to the group IVA padilla (tp5647) – HW06: Bonding Part II – shear – (52375) 2 of the periodic table. 005 10.0 points A hydrogen atom does not bond to more than one element at a time because 1. It doesn’t form covalent bonds. 2. Hydrogen prefers to exist as a free radi- cal. 3. Hydrogen prefers to exist as a homonu- clear diatomic molecule. 4. It is too small. 5. With only two electrons needed to fill its valence shell it can’t. correct Explanation: 006 10.0 points The P 2- anion has how many total electrons and how many valence electrons? 1. 16; 5 2. 17; 6 3. 15; 7 4. 15; 5 5. 17; 8 6. 17; 7 correct 7. 16; 6 8. 16; 7 9. 18; 8 10. 15; 6 Explanation: P 2- has gained 2 electrons to give it a total of 17. In its valence, it has 3 s 2 3 p 5 , giving it a total of 7 valence electrons. 007 10.0 points Which of the following is the best represen- tation of the compound potassium sulfide? 1. None is appropriate because potassium sulfide is a covalent compound. 2. K 2+ , bracketleftbigg S b b b b b b b b bracketrightbigg 2- 3. 3 K 2+ , 2 bracketleftbigg S b b b b b b b b bracketrightbigg 3- 4. K + , bracketleftbigg S b b b b b b b b bracketrightbigg- 5. K 2+ , 2 bracketleftbigg S b b b b b b b b bracketrightbigg- 6. 2 K + , bracketleftbigg S b b b b b b b b bracketrightbigg...
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This note was uploaded on 03/31/2010 for the course CH ch302 taught by Professor F during the Spring '09 term at University of Texas-Tyler.

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ch06 - padilla (tp5647) – HW06: Bonding Part II – shear...

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