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CHEM 1301 FALL 2003 TEST 2 VERSION 1 DON’T FORGET TO BUBBLE “1” UNDER “P” 1. What is the electron configuration of the metalloid antimony (Sb)? (A) (D) [Xe]5s24d105p3 [Xe]5s22d105p3 2. An atom has the valence electron configuration, ns2np5. What group is it in? (A) noble gas 3. When forming cations, electrons are removed first from orbits that are bigger rather than necessarily those with higher energy. Given this, what is the electron configuration of the titanium(II)cation, Ti2+? (A) [Ar]4s23d2 4. Which ions should be formed by calcium, selenium, and aluminium, respectively? (A) Ca2+, Se6+, Al3+ 5. Which element, isotope, or ion listed below contains 21 protons, 20 neutrons, and 18 electrons? (A) 41 6. Consider the anion from an atom of 80Br. How many protons, electrons and neutrons does it contain? (A) 35, 35, 45 Sc3- (B) (E) (B) (B) (B) (B) (B) alkali metal [Ar]4s23d4 Ca2+, S2-, Al3+ 41 Ca2+ 35, 36, 80 [Kr]5s22d104p3 5p3 (C) (C) (C) (C) (C) (C) alkaline earth metal [Ar]4s2 C4-, Se2-, Al3- 41 Sc3+ 35, 35, 80 1 [Kr]5s24d105p3 (D) chalcogen (E) halogen (D) [Ar]4s13d1 (E) [Ar]3d2 (D) Ca2+, Se2-, Al3+ (E) Ca+, Se-, Al+ (E) 41 (E) 36, 36, 44 (D) (D) 39 Sc3+ 35, 36, 45 Ar 7. Which pair of particles has the same number of electrons? (A) F-, Mg2+ 8. How many dots will be drawn in the correct Lewis structure of ICl2-? (A) 20 9. Which of the following species contains the most lone pairs in its correct Lewis structure? (A) CCl4 10. Which of the following species has a Lewis structure that can be drawn so that it obeys the octet rule (i. e, all atoms are "happy")? (A) KrF2 11. According to what we have discussed in this class, which of the following substances could exist? (A) HeF2 12. Bearing in mind the relationship between sulfate and sulfite, what is the formula of phosphite? (A) PO43- 13. Which of the following compounds contains both ionic and covalent bonds? (A) HCl 14. What is the name given to the compound whose formula is As3Cl6? (A) (D) arsenic chlorine triarsenic hexachloride (B) (B) (B) (B) (B) (B) (B) Br-, Se (C) 21 (C) CS2 (C) BF3 (C) NF5 (C) HPO43- (C) NaCl (C) (B) (E) Ne, Ar 22 PF3 NO2 BH4- PO42- H2O arsenic chloride triarsenic hexachlorine 2 (D) Al3+, P3- (E) Na, Na+ (D) 23 (E) 88 (E) O2 (D) (D) (D) SeCl2 BH3 H3 (E) IF3 (E) none of them (D) PO33- (E) PO32- (D) NaOH (E) CO2 (C) arsenic hexachloride 15. What is the chemical formula of calcium phosphate? (A) CaP 16. Within the context of this course, which of the following statements is false? (A) (C) (E) Hydrogen will never make more than one bond Compounds are known that contain noble gas atoms Phosphorus can form more than four bonds 17. Which of the following does not have a charge of –1? (A) chloride 18. Which of the following species is correctly matched with its shape? (A) (D) ammonium / trigonal pyramidal carbonate / trigonal planar 19. Which is the most electronegative atom in each of the following pairs? I. O or S (A) (B) (C) (D) (E) I. I. I. I. I. 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 [NH3]? (A) 109.5° (B) S S O O O (B) Ca3P2 hydroxide II. B or H II. II. II. II. II. B H B H B (B) (C) 120° (B) (E) CaPO4 (B) (D) (C) (D) III. III. III. III. III. (E) Ca2(PO4)3 Carbon will never make more than four bonds Oxygen will never make more than two bonds bicarbonate (D) boron trihydride / trigonal pyramidal water / linear III. Ca3(PO4)2 nitrate (C) (E) ammonium carbon dioxide / bent O or Cl O Cl Cl O O (C) <109.5° 3 (D) >109.5° (E) >120°