Wrecking Ball A 2,200-pound wrecking ball is held in static equilibrium by two cables, one horizontal and one at an angle of 40 from vertical (Figure 24). Find the magnitudes of the tension vectors T and H.
CHEM 1301 SPRING 2004 TEST 2 VERSION 1 NO CHEATING! BUBBLE IN “1” IN THE P COLUMN TO GET YOUR GRADE POSTED!!!!! [the only way you’ll find out how you did!] 1. What is the electron configuration of a neptunium atom [Np] 2 1 4 2 1 4 2 1 4 2 1 4 2 5 (A) [Rn]7s 6d 5f (B) [Xe]7s 6d 5f (C) [Rn]6s 5d 4d (D) [Rn]7s 6d 6f (E) [Rn]7s 5d 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. What ions would be expected to form from the following atoms: Ti, As, Sr 4+ 3- + 4+ 5+ 2+ 4+ 3- 2+ (A) Ti2+, As5+ Sr+ (B) Ti2+ As 3-Sr + (C) Ti , As , Sr (D) Ti , As , Sr (E) Ti , As , Sr 4. How many protons, neutrons and electrons, respectively would be in the ion formed by an atom of potassium-39 (A) 15, 24, 18 (B) 15, 24, 15 (C) 19, 20, 19 (D) 19, 20, 18 (E) 19, 39, 19 5. Which symbol corresponds to a species that has 40 protons, 56 neutrons and 36 electrons (A) 9Zr 4+ (B) 96Zr4- (C) 84Kr (D) 9Zr 4+ (E) 96Kr 6. What is the formula of the ionic compound, calcium nitride (A) CaN (B) CaNO 2 (C) Ca(NO ) 2 2 (D) Ca 3 2 (E) Ca 2 3 1 7. Lewis structures aid the chemist to visualize: (A) proton arrangements within ionically bonded compounds (B) electron arrangements within ionically bonded compounds (C) proton arrangements within covalently bonded compounds (D) electron arrangements within covalently bonded compounds (E) pretty pictures - 8. How many electrons should be drawn in the Lewis structure of 6F (A) 46 (B) 47 (C) 48 (D) 69 (E) 70 9. In the Lewis structure of 2Fthere are ____ single bonds and ____ total lone pairs (A) 2,8 (B) 3,8 (C) 2,2 (D) 2,6 (E) 3,6 10. Which of the following species contains only atoms that "obey" the octet rule (A) NO 3- (B) NO (C) BH 3 (D) SF 6 (E) XeF 4 11. Which of the following compounds contains both ionic and covalent bonds (A) HCl (B) NaCl (C) H 2 (D) NaOH (E) CO 2 12. Which of the following molecules can be correctly described by a Lewis structure that obeys "common sense" (A) SF 2 (B) SF 4 (C) SF6 (D) XeF 2 (E) ClBr3 13. Which of the following molecules can be correctly described by a Lewis structure that contains only single bonds (A) C 2 4 (B) C 2 2 (C) CO 2 (D) N 2 2 (E) N2 4 2 14. Within the context of this course, which of the following statements is false (A) Hydrogen will never make more than one bond (B) Carbon will never make more than four bonds (C) Compounds are known that contain noble gas atoms (D) Nitrogen will never make more than 3 bonds (E) Sulfur can form more than 4 bonds 15. Which one of the following molecules and ions will definitely have at least one 90° bond angle in it (A) BF 4- (B) PH 3 (C) PF 5 (D) SO 2 (E) H 2 16. Which of the following species does not have a trigonal planar shape (A) BH 3 (B) carbonate (C) nitrate (D) CH O2 (E) NCl 3 17. Which atom in each of the following pairs is more electronegative I. O or S II. C or N III. O or Cl (A) I. O II. N III. O (B) I. O II. C III. Cl (C) I. O II. N III. Cl (D) I. S II. C III. Cl (E) I. S II. N III. O 18. Which of the following does not have a charge of –1 (A) nitrate (B) hydroxide (C) ammonium (D) chloride (E) acetate 19. Bearing in mind the relationship between sulfate and sulfite or nitrate and nitrite, what is the formula of phosphite (A) PO 4- (B) HPO 43- (C) PO 42- (D) PO 33- (E) PO 32- 20. What is the formula of the, ionic compound, calcium nitrite (A) CaN (B) CaNO 2 (C) Ca(NO )2 2 (D) Ca 3 2 (E) Ca 2 3 3