CHEM 1045 Exam 2 Summer 2024 Practice Exam PDF

Version A CHEM 1045 Exam 2 Summer 2024 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which classification fits the molecule below? ClO31- a. ionic...

Version A CHEM 1045 Exam 2 Summer 2024 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which classification fits the molecule below? ClO31- a. ionic c. homonuclear diatomic b. homonuclear polyatomic d. heteronuclear polyatomic 2. What is the molecular formula for butane (C4H10)? a. C4H10 b. C2H5 c. CH2.5 d. C8H20 3. Which of the following has the highest lattice energy? a. BaI2 b. MgF2 c. NaCl d. KBr 4. Which of the following has the highest electronegativity? a. Rb b. Sr c. Mg d. Si 5. Aluminum oxide (Al2O3 MM= 101.96 g/mol) is a material used in many ceramics. If there is a sample of Aluminum oxide that is 407.84 g/mol. What is the molecular formula of this sample? a. Al2O3 b. Al4O6 c. Al8O12 d. Al10O15 6. What is the molar mass for beryllium nitrate tetrahydrate? a. 205.11 g/mol b. 133.03 g/mol c. 151.05 g/mol d. 71.022 g/mol 7. What is the percent composition of K in KNO3? a. 13.85% b. 38.67% c. 47.48% d. 61.33% 1  Version A 8. Which of the following is the correct name for the compound below? CrCl4 a. chromium tetrachloride c. chromium chloride b. chromium (IV) chloride d. chromium chlorine 9. Which compound: name combination is correct? a. CCl4 : carbon tetrachloride c. PCl3 : phosphorous chloride b. SBr2 : monosulfur dibromide d. N2O3 : nitrogen tribromide 10. What is the name of the acid below? HBrO a. bromic acid c. perbromic acid b. bromous acid d. hypobromous acid 11. How many atoms are in 5.85 g of LiBr (MM= 86.845 g/mol)? a. 4.06 ´ 1022 atoms c. 1.12 ´ 10-25 atoms b. 2.06 ´ 1025 atoms d. 8.44 ´ 10-22 atoms 12. Which of the following is an ionic compound? a. NO2 b. CH4 c. Fe2O3 d. P2S3 13. What is the empirical formula of a compound containing only carbon hydrogen and oxygen if the compound is 40.0% C, and 6.71% H? a. CH2O b. CHO2 c. CHO d. C2HO 2  Version A 14. How many electron domains are in the structure for SO42-? Lewis structure shown below. a. 4 b. 6 c. 2 d. 8 15. How many valence electrons are there in PO43-? a. 29 b. 26 c. 32 d. 30 16. Which of the following is the correct representation for the polar covalent bond Cl-I? a. c. b. d. 3  Version A 17. Which of the following has the highest bond length? a. c. b. d. 18. What is the bond order of P2? a. 1 b. 2 c. 3 d. 4 19. What is the molecular geometry (MG) of the structure below? a. trigonal b. see-saw c. tetrahedral d. T-shaped bipyramidal 20. What is the Electron Domain Geometry (EDG) of the structure below? a. trigonal planar b. tetrahedral c. linear d. Octahedral 4  Version A 21. Which of these best describes the bond angles in the figure below? a. 90° c. between 120° - 180° b. 120° d. between 90° - 120° 22. What is the formal charge of S in SCN? a. -1 b. +1 c. 0 d. -2 23. What is the VSEPR Classification of the molecule shown below? a. AB3 b. AB3U2 c. AB5 d. AB2U3 5  Version A 24. Which of the following is the correct structure for NH3? a. c. b. d. 25. Which one of these is a valid resonance structure for the structure shown below? a. c. b. d. 6  Version A CHEM 1045 Exam 2 Summer 2024 Answer Section MULTIPLE CHOICE 1. D 2. B 3. B 4. D 5. C 6. A 7. B 8. B 9. A 10. D 11. A 12. C 13. A 14. A 15. C 16. C 17. B 18. C 19. B 20. A 21. D 22. A 23. B 24. C 25. B 7