Dr. Taylor Chapter 6 and 7 homework Chem 111 Spring C. : Cl. Ca 2+ D. Ca 2+ E. Ca
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1 Dr. Taylor Chapter 6 and 7 homework Chem 111 Spring 2012 Chapter 5: 3, 5, 7 and 9 Chapter 6: 23, 25, 29, 31, 35, 37, 39, 41, 53, 57, 59, 73 and 79 Chapter 7: 7, 9, 11, 13, 19, 21, 35, 37, 39, 43, 45, 47, 49, 79 and The Lewis dot symbol for the S 2 ion is : : A. S : B. S : 2 C. S 2 D. S 2 E. : S 7. The Lewis dot symbol for the chloride ion is A. Cl : : B. Cl : C. : Cl D. : Cl : E. Cl 8. The Lewis dot symbol for the calcium ion is : Ca 2+ B. Ca C. : : A. : 16. The electron dot formula for O 2 shows Ca 2+ D. Ca 2+ E. Ca A. a single covalent bond B. a double covalent bond C. an ionic bond D. a total of 8 x 2 = 16 electron dots E. a total of 32 electron dots 17. The number of lone electron pairs in the N 2 molecule is. A. 1 B. 2 C. 3 D. 4 E The electron dot structure for AsCl 3 shows A. a total of 84 electron dots B. three single bonds and 10 lone pairs C. two single bonds, one double bond, and 9 lone pairs D. one single bond, two double bonds, and 8 lone pairs E. three single bonds and one lone pair 19. The total number of bonding electrons in a molecule of formaldehyde (H 2 CO) is A. 3 B. 4 C. 6 D. 8 E The total number of lone pairs in NCl 3 is A. 6 B. 8 C. 9 D. 10 E What is the Lewis structure for CS 2? 22. Draw Lewis dot structures obeying the octet rule for (a) ClO, (b) ClO 2, (c) ClO 3,(d) ClO Which of the following species can have resonance structures? A. CH 3 NH 2 B. HCO 2 D. BF 4 E. CH 3 COOH C. H 3 O +
2 24. Resonance forms can be written for A. NH 3 B. H 2 S C. H 2 O D. OF 2 E. SO How many resonance forms can be written for the NCS ion? 26. For the Lewis structure below, what are the formal charges on N, C, and S? 27. For the Lewis structure below, what are the formal charges on C, S, and N? 28. For the Lewis structure below, what are the formal charges on C, N, and O? 29. For the Lewis structure below, considering the atoms from left to right, the formal charges on N, N, and O, respectively, are 30. How many lone pairs are around Xe in XeO 2? 31. Which of the following would have a Lewis structure most like that of ICl 2 +? A) XeF 2 B) CO 2 C) XeO 2 D) I 3 E) O 3 VSEPR Theory and Molecular Shape and Hybridization 1. What is the OClO bond angle in ClO 4? 2. What is the OCO bond angle in CO 3 2? 3. What is the FSF bond angle in SF 2? 4. Predict the shape FCl Predict the shape of AsF 5 6. Predict the shape of AsF 3 7. Predict the shape of SbH 3 8. Predict the shape of SeO 2 9. Predict the shape of IO 4 -
3 10. Predict the shape of ICl Predict the shape of TeF Predict the shape of SiO Predict the shape of ICl Which of the following molecules would be expected to be polar? A. HBr B. POCl 3 C. CH 2 O D. SnCl 4 E. SbCl What is the shape of a molecule that has a VSEPR formula of AX 3 E? 16. What is the shape of a molecule with no multiple bonds and a central atom with five bonding pairs of electrons? 17. What is the shape of a molecule with no multiple bonds and a central atom with 2 bonding pairs and 1 lone pair of electrons? 18. What is the shape of a molecule that has a VSEPR formula of AX 4 E? 19. What is the shape of a molecule that has a VSEPR formula of AX 5 E? 20. The Lewis structure of the nitrite ion (NO 2 - ) shows around the central nitrogen atom A. 2 single-bonded oxygens and 2 lone pairs of electrons. B. 2 double-bonded oxygens. C. 2 single-bonded oxygens and 1 double-bonded oxygen. D. 1 single-bonded oxygen, 1 double-bonded oxygen, and 1 lone pair of electrons. E. 3 single-bonded oxygens and 1 lone pair of electrons. 21. How many electron pairs (both bonding and lone pairs) are on the sulfur atom in SF 4? 22. In the Lewis structure of SeF 3 +, the central atom has A. 1 lone pair and 6 bonding pairs of electrons. B. 2 lone pairs of electrons. C. 1 lone pair of electrons. D. 2 lone pairs and 3 bonding pairs of electrons. E. 3 lone pairs of electrons. 23. Which of the following molecules is polar? A. COS B. S 2 C. CO 2 D. CS 2 E. O 2
4 24. Which of the following molecules is polar? A. XeF 4 B. CH 4 C. SF 6 D. PCl 5 E. IF What type of hybrid orbitals best describe the bond between the two oxygen atoms in peroxyacetylnitrate (you will have to fill in the lone pairs)? 26. What type of hybrid orbitals best describe the bond between the two oxygen atoms in peroxymonosulfate (fill in lone pairs)? HOOSO What type of orbitals best describe the bond between carbon and oxygen atom 1 in peroxyacetic acid? One of the dominant resonance forms of diazomethane is 28. Describe the hybrid orbitals used to form the CN bond and the NN bond 29. What are the values of the HCN and CNN bond angles? 30. What set of hybrid orbitals are used by Xe in XeF4? 31. What set of hybrid orbitals are used by As in AsF5? 32. What set of hybrid orbitals are used by S in SF4? 33. What set of hybrid orbitals are used by Si in SiH4? 34. What set of hybrid orbitals are used by C in COCl 2? 35. What set of hybrid orbitals is used by N in NO 2?
5 36. How many sigma and how many pi bonds are present in H 3 CCH=CHCH 2 OH? (Hint-draw showing all bonds and lone pairs 37. How many sigma and how many pi bonds are present in CH 2 =C=CH 2? 38. How many sigma and how many pi bonds are present in H 3 CSCN? The structure of the amino acid histidine is shown below is for questions What hybrid orbitals are used on ring nitogen 1 and 2? 40. Describe the hybrid orbitals used to form the bond between ring nitrogen 1 and ring carbon What hybrid orbitals are used on the amino nitrogen 5? 42. What hybrid orbitals are used on carbon 4? Answers: Chemical Bonding and Lewis Structures 1. A 2. B 3. B 4. C 5. C 6. B 7. B 8. D 9. E 10. C 11. E 12. D 13. B 14. B 15. A 16. B 17. B 18. B 19. D 20. D 21. S C S 22. (a) : O : Cl : 23. B E : O : (b) : O : Cl : : O: 26. 1, 0, 0 (N,C,S) (c) : O : Cl : : O:..
6 , +2, 1 (C,S,N) : O :.. (d) : O : Cl : O :.. : O : 28. 2, +1, 0 (C,N,O) , +1, 0 (N,N,O) C VSEPR Theory and Molecular Shape and Hybridization 1. equal to equal to < bent 5. trigonal bipyramidal 6. trigonal pyramidal 7. trigonal pyramidal 8. bent 9. tetrahedral 10. square planar 11. octahedral 12. tetrahedral 13. linear 14. a, b and c 15. trigonal pyramidal 16. trigonal bipyramidal 17. angular 18. seesaw 19. square pyramidal 20. D C 23. A 24. E 25. sp 3 sp sp 3 sp sp 2 sp sp 2 -sp; sp-sp and sp 3 d sp 3 d 32. sp 3 d 33. sp sp sp sigma and 1 pi sigma and 2 pi sigma and 2 pi 39. N1 is sp 3 ; N2 is sp sp 3 -sp sp sp 2
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