Practice Exam 0201 Name: Date:

Practice Exam 0201 Name: Date: 1. Dalton s atomic theory consisted of all the following postulates EXCEPT A) atoms of different elements have different properties. B) elements are composed of indivisible particles called atoms. C) with gases, the volumes consumed and produced are in ratios of small whole numbers. D) atoms combine in fixed ratios of whole numbers. E) in chemical changes, atoms are not destroyed, created, or changed. 2. The number of protons in a given nucleus determines the A) number of electrons. B) atomic number. C) mass number. D) number of protons. E) number of isotopes. 3. The nucleus of a radon, 222 Rn, contains A) 222 protons and 86 neutrons. B) 86 protons and 136 neutrons. C) 86 protons and 86 electrons. D) 86 protons, 136 neutrons, and 86 electrons. E) 86 neutrons and 86 electrons. 4. How many protons, neutrons, and electrons are in the antimony(iii) ion, 123 Sb 3+? A) 123p, 72n, 123e B) 51p, 72n, 48e C) 51p, 72n, 51e D) 72p, 51n, 69e E) 48p, 72n, 51e 5. What is the symbol of the ion having 13 protons and 10 electrons? A) Ca 2+ B) Al 3+ C) P 3- D) S 2- E) Cl - Page 1

6. An ion that has 18e and a net charge of +2 A) has 18 neutrons. B) is an anion. C) has the same number of electrons as an argon atom. D) has the symbol Ar 2+. E) has 16 protons. 7. Which combination represents a 58 Fe 2+ ion? A) 58p, 26n, 24e B) 58p, 26n, 56e C) 26p, 32n, 28e D) 26p, 32n, 26e E) 26p, 32n, 24e 8. The atomic mass of Eu is 151.96. There are only two naturally occurring isotopes of europium, 151 Eu with a mass of 151.0 and 153 Eu with a mass of 153.0. The natural abundance of the 131 Eu isotope must be approximately A) 20%. B) 40%. C) 50%. D) 60%. E) 80%. 9. Which of the following represents a pair of isotopes? Atomic Number Mass Number A) I 7 14 II 8 14 B) I 17 35 II 17 37 C) I 7 15 II 8 16 D) I 17 34 II 18 35 E) I 17 34 II 18 34 Page 2

10. There are three isotopes of carbon differing with respect to A) neutrons. B) atomic number. C) nuclear charge. D) electron configuration. E) number of protons. 11. The total number of atoms in one formula unit of (CH 3 ) 2 NH 2 ClO 2 is A) 8. B) 5. C) 14. D) 12. E) 16. 12. Which of the following is NOT a correct name symbol combination? A) arsenic, Ar B) manganese, Mn C) copper, Cu D) gold, Au E) lithium, Li 13. The names of the elements whose symbols are Si, P, Mn, and S are, respectively, A) silicon, potassium, manganese, and sulfur. B) silver, phosphorus, magnesium, and sodium. C) silicon, potassium, magnesium, and sulfur. D) silver, potassium, manganese, and sodium. E) silicon, phosphorus, manganese, and sulfur. 14. The name of the SO 4 2- ion is A) persulfate. B) sulfite. C) thiosulfite. D) sulfate. E) sulfide. Page 3

15. All the following ions have the same charge EXCEPT A) sulfide. B) sulfite. C) sulfate. D) chlorate. E) dichromate. 16. The species Na +, Mg 2+, and Al 3+ are all A) anions. B) cations. C) isotopes. D) isoelectronic. E) allotropes. 17. The formula for aluminum sulfate is A) Al 2 (SO 3 ) 3. B) Al 2 (SO 4 ) 3. C) Al 3 (SO 4 ) 2. D) Al 3 S 2. E) Al 2 S 3. 18. An element, X, has the following isotopic composition: X-200, 90%; X-199, 8.0%; and X-202, 2.0%. Its atomic mass is CLOSEST to A) 199 amu. B) 200 amu. C) 201 amu. D) 202 amu. E) It cannot be determined. 19. The formulas of the nitrite, phosphide, and nitrate ions are represented, respectively, as A) NO 2, PO 4 3, NO 4. B) N 3, PO 3 3, NO 3. C) NO, P 5, NO 3. D) NO 2, P 3, NO 3. E) NO 3, PO 2, N 3. Page 4

20. The formula for copper(ii) phosphate is A) CuPO 4. B) Cu 3 (PO 4 ) 2. C) Co 2 (PO 4 ) 3. D) Cu 2 (PO 4 ) 3. E) Co 3 (PO 4 ) 2. 21. The formula for aluminum iodide is A) AI. B) AlI. C) AlI 2. D) AlI 3. E) AlI 4. 22. The formula for chlorous acid is A) HClO. B) HClO 2. C) HClO 3. D) HClO 4. E) HCl. 23. The oxoanion that comes from nitrous acid is A) NO. B) NO 2. C) NO 3. D) N 2 O 3. E) HNO 3. 24. All the following oxoacids and names 1. H 2 SO 3 sulfurous acid 2. HClO 2 chlorous acid 3. H 2 CO 3 carbonic acid is (are) correct EXCEPT A) 1 only. B) 2 only. C) 3 only. D) 1 and 2 only. E) All are correct. Page 5

25. The complete combustion of octane, C 8 H 18, yields carbon dioxide and water: C 8 H 18 + O 2 CO 2 + H 2 O The coefficient of oxygen in the balanced equation is A) 17. B) 19. C) 23. D) 25. E) 34. 26. The products of the combustion of acetaldehyde with oxygen are shown in the following equation: CH 3 CHO + O 2 CO 2 + H 2 O When properly balanced, the equation indicates that molecules of O 2 are required to burn 2 molecules of CH 3 CHO. A) 2 B) 3 C) 4 D) 5 E) 6 Page 6

27. Which of the following equations is (are) balanced? 1. NaCl + Pb(NO 3 ) 2 PbCl 2 + NaNO 3 2. (NH 4 ) 2 Cr 2 O 7 N 2 + 4H 2 O + Cr 2 O 3 3. Fe 3 O 4 + 3CO 3Fe + 3CO 2 A) 1 only B) 2 only C) 3 only D) 1 and 2 only E) 1, 2, and 3 28. All of the formulas and names are correct EXCEPT A) CH 4, methane. B) CH 3 OCH 3, dimethyl ether. C) CH 3 CH 2 OH, ethyl alcohol. D) C 6 H 6, benzene. E) C 2 H 2, ethylene. 29. From a balanced equation we should be able to extract the following information: 1. the number of molecules of reactants and products. 2. the relative mass of each reactant and product. 3. the number of atoms of each element before and after reaction. A) 1 only B) 2 only C) 3 only D) 1 and 2 only E) 1, 2, and 3 Page 7

30. The following species, 15 P 3, 17 Cl, and 20 Ca 2+, all have the same number of A) protons. B) electrons. C) neutrons. D) isotopes. E) nucleons. 31. The volume of 0.150-molar NaHCO 3 (FW = 84.0) solution that contains 6.30 g of Na 2 CO 3 is A) 0.200 L. B) 0.400 L. C) 0.500 L. D) 1.60 L. E) 2.50 L. Page 8

Answer Key 1. C 2. B 3. B 4. B 5. B 6. C 7. E 8. C 9. B 10. A 11. C 12. A 13. E 14. D 15. D 16. B 17. B 18. B 19. D 20. B 21. D 22. B 23. B 24. E 25. D 26. D 27. B 28. E 29. E 30. B 31. C Page 9