CHE 3331 Study Guide - Quiz Guide: Lone Pair, Heteroatom, Intermolecular Force

8 which of the following solids would have the highest melting point? ( 1) KI (2) KBr (3) KCI (4) KF 9. What type of chemical bond holds the atoms together within a water molecule? (1) polar ionic bond(3) non polar covalent bond (4) coordinate covalent bond 10. Which of the following covalent bonds is the most polar (i.e., highest percent ionic character)? (1) A -CI (2) Si- (3)Al- (4) SI-Ci 11. The total number of valence electrons in the ion SO is (1)32 (2)28 (3)30 (4) 26 12. The Lewis structure reveals a double bond in which of the following molecules? (1)N (2) Br (3) CS: (4) CaHe 13. The Lewis structure reveals an unpaired electron (free radical) in which of the following species? () NO (2)N:O (3) NO (4) NO 14. The number of lone electron pairs in the CIO ion is (1) 12 (2)16 (3)4 (4)0 15. The formal charge on the bromine atom in BrOs drawn with three single bonds is (1)*2 16. Which of the elements listed below would most likely form a polar covalent bond when bonded to sulfur? 17. Give the number of lone pairs around the central atom and the molecular geometry of SeF(1)0 lone 18. According to Molecular Orbital Theory, two separate 1s orbitals interact to form what molecular orbital(l)? 19. The Lewis dot symbol for the S-ion is (2)-1 (1) K (2) Mg (3)C (4)o pairs, tetrahedral (2) 1 lone pair, square pyramidal (3) 1 lone pair, tetrahedral (4) 1 lone pair, distorted tetrahedron (seesaw) (1)oonly (2) π only (3) π and π. (4) σ and σ. 2- 20. Which of the following molecules has polar bonds but is a nonpolar molecule? (1) CO (2) Cla 21. Use VSEPR theory to predict the geometry of the SFe molecule. (1) trigonal bipyramidal (2) bent 22. The geometry of the hybrid orbitals about a central atom with sp hybridization is (1) linear (2) bent 23. Which of the following molecules have the same geometries? (1) CO2 and BeHa (2) SFa and CHe 24. According to the VSEPR theory, which one of the following species is linear? (1)HaS (2) SO2 25. Which of the following substances will display an incomplete octet in its Lewis structure? (1) CO2 26. Predict the geometry and polarity of the CS2 molecule. (1) linear, polar (2) linear, nonpolar (3) SO (4) HBr (3) trigonal planar (4) octahedral (3) trigonal planar(4) tetrahedral (3) CO2 and NO2 (4) N2O and NO2 (3) BFs (4) BeF2 (2) NO (3) Cl2 (4) BrCI (3) bent, nonpolar (4) bent, polar

Draw the lewis Dot Structure for the following molecules- You can use S=N-A or not. Remember a) get the best structure using the octet rule (assume all atoms have to obey the octet rule) b) determine the formal charge on each atom c) identify the elements which can have an expanded octet (row 3 and below) d) Try to reduce formal charges by redistributing electrons from elements on the periphery (usually these do not have more than 8 electrons) to the inner atoms which can accommodate expanded octets. e) make sure only atoms which can accommodate expanded octets actually have expanded octets. f) Make sure only atoms which are m groups 2, 3 have less than 8 electrons in their valence shell. O_3 PF_5 N_2O_4 5F_4 H_2CO_3 H_2CO H_2SO_3 SO_4^-2 BF_3 AlH_4^-1 CH_3CH_2NH_2 H_2O HF 2. Determine the electron domain geometry for each of the above compounds. Determine the molecular geometry for each of the compounds in question 1 Determine the hybridization for each of the atoms in question 1 Which of the compounds in question 1 will have a dipole? (first determine if polar covalent bonds exist, then see if they reinforce or cancel each other out) Which of the compounds in question 1 exhibit hydrogen bonding? Which of the compounds in question 1 exhibit resonance. Which of the compounds in question 1 exhibit dispersion forces? For the following organic molecules, determine the number of pi bonds, number of n bonds, number of sp^3, sp^2, sp hybridzed atoms, number of lone pairs, electronic domain geometries and molecular geometries.