In Exercises 13 34, test for symmetry and then graph each polar equation.
CHEM 1301 FALL 2001 TEST 2 VERSION 1 DON’T FORGET TO BUBBLE “1” UNDER “P” 1. The ground–state electronic configuration of the cobalt atom is 2 2 6 2 6 2 7 2 2 6 2 6 9 2 2 6 2 6 2 7 (A) 1s 2s 2p 3s 3p 4s 4d (B) 1s 2s 2p 3s 3p 3d (C) 1s 2s 2p 3s 3p 4s 4p (D) 1s 2s 2p 3s 3p 4s 3d (E) none of these 2. An atom has the valence electron configuration, ns np . What group is it in (A) noble gas (B) alkali metal (C) alkaline earth metal (D) chalcogen (E) halogen 3. When forming cations, electrons are removed first from orbitals that are bigger rather than necessarily those with higher energy. Given this, what is the electron configuration of the ferrous cation, Fe (A) [Ar]4s23d6 (B) [Ar]4s 3d 4 (C) [Ar]4s 3d 5 (D) [Ar]4s 3d8 (E) [Ar]3d6 4. Which ions should be formed by sodium, nitrogen, and scandium, respectively (A) S2-, N , Sc+ (B) Na , N , Sc 3+ (C) S , N , Sc 3+ (D) Na , N , Sc3+ (E) S , Ne, Sc3+ 5. Which element, isotope, or ion listed below contains 20 protons, 21 neutrons, and 18 electrons (A) 41Ca 2- (B) 41Ca 2+ (C) 41Sc+ (D) 41 Ca (E) 41Ar 6. Consider the anion from an atom of selenium-80. How many protons, electrons and neutrons does it contain (A) 34, 34, 46 (B) 34, 36, 80 (C) 34, 34, 80 (D) 34, 36, 46 (E) 36, 36, 46 7. Which pair of particles has the same number of protons (A) F , Mg 2+ (B) Br , Se (C) Ne, Ar (D) Al3+ , P– (E) Na, Na + 8. Which of the following molecules has an ideal Lewis structure (that is, all atoms happy) - (A) SF4 (B) NO 2 (C) BH 4 (D) XeF 2 (E) SiF 6 9. Which of the following compounds contains both ionic and covalent bonds (A) HCl (B) NaCl (C) H 2O (D) NaOH (E) CO 2 10. Some people draw the Lewis structure of sulfate as a sulfur atom with single bonds to 4 oxygen atoms. In such a structure, how many DONOR bonds are there (A) 0 (B) 1 (C) 2 (D) 3 (E) 4 11. Which molecule contains one unshared pair of valence electrons (A) H 2 (B) PH3 (C) SiH 4 (D) F2 (E) CO 2 12. The prefix “bi” is added to anion names to indicate an extra positive hydrogen, as for example, in bicarbonate compared to carbonate. Which of the following anions would be known as bisulfate - 2- 2- - (A) HS (B) (SO4 2 (C) HSO 4 (D) HSO 4 (E) H 2O 4 13. What is the name given to the compound whose formula is Si S 3 6 (A) silicon sulfur (B) trisilicon hexasulfur (C) trisilicon sexasulfide (D) trisilicon hexasulfide (E) hexasulfur trisilicide 14. What is the chemical formula of aluminum carbonate (A) AlC (B) AlCO (C) AlCO 3 (D) Al2(CO 3 3 (E) Al 3CO )3 2 15. Which of the following does not have a charge of –1 (A) nitrate (B) hydroxide (C) ammonium (D) hypochlorite (E) acetate 16. Given the following electronegativity values, select the most polar bond from the options: Cl 3.0 H 2.1 C 2.5 P 2.1 F 4.0 Na 0.9 (A) H-Cl (B) F-H (C) F-Cl (D) C-P (E) H-P 17. In which bond are the partial charges on the atoms correct δ- δ+ δ+ δ- δ+ δ- δ+ δ- δ+ δ- (A) Si-O (B) Cl-Br (C) N-B (D) Cl-Cl (E) Si-O 18. Which one of the following will have a trigonal pyramidal shape 2- (A) BCl 3 (B) SeO 3 (C) SeO 2 (D) CO 3 (E) PBr 3 19. Which of the following species is correctly matched with its shape (A) ammonium / trigonal pyramidal (B) boron trihydride / trigonal pyramidal (C) carbon dioxide / bent (D) carbonate / trigonal planar (E) dihydrogen monoxide / linear 20. In reality, one finds that lone pairs are more repulsive than bonding groups. With this in mind, what would be the observed angle in ammonia [NH ] 3 (A) 109.5° (B) 120° (C) <109.5° (D) >109.5° (E) >120°