# Chemistry Placement Exam Sample Test

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1 Chemistry Placement Exam Sample Test 1. The product of will have how many significant figures? a. 2 b. 3 c. 23 d e. 7 ANSWER: B 2. How many significant figures should there be in the answer when you divide 4.1 by 7.464? a. 7 b. 4 d. 2 e How many significant figures are there in the result of the following calculation? (4.321/2.8) ( ) a. 1 b. 2 d. 4 e The result of the following calculation has how many significant figures? (1.433) (33.1 C 31.1 C)(612) a. 1 b. 2 d. 4 e. 5

2 5. A student finds that the weight of an empty beaker is g. She places a solid in the beaker to give a combined mass of g. To how many significant figures is the mass of the solid known? a. 2 b. 3 c. 1 d. 5 e Calculate the mass of a rectangular solid that has a density of 3.96 g/cm 3 and measures 2.50 cm by 1.80 cm by 3.00 cm. a g b g c g d g e g 7. Find the volume of an object that has a density of 3.14 g/ml and a mass of 94.7 g. a ml b. ml c. 297 ml d. ml e. ml 8. If a 100.-g sample of platinum metal has a volume of ml, what is the density of platinum in g/cm 3? a g/cm 3 b g/cm 3 c g/cm 3 d. 467 g/cm 3

3 9. An experiment requires 74.2 ml of ethyl alcohol. If the density of ethyl alcohol is g/cm 3, what is the mass of 74.2 ml of ethyl alcohol? a g b g c g d. g 10. If a 100.-g sample of a metal has a volume of 8.65 ml, what is the density of the metal? a g/ml b g/ml c g/ml d. 9 g/ml 11. The volume (in milliliters) occupied by 41.9 g of mercury (density = 13.6 g/ml) is a. 570 ml b ml c ml d ml 12. How many protons, electrons, and neutrons, respectively, does 31 P have? a. 15, 15, 16 b. 15, 16, 15 c. 16, 15, 31 d. 15, 15, 31 e. 15, 31, How many protons, electrons, and neutrons, respectively, does oxygen have? a. 8, 18, 8 b. 8, 8, 8 c. 8, 10, 8 d. 8, 14, 8 e. 8, 18, 16

4 14. The atom with 69 neutrons and 50 protons has a mass number of a. 69 b. 50 c. 19 d. 119 e. cannot be determined from information given 15. How many neutrons are contained in an iodine nucleus with a mass number of 131? a. 53 b. 74 c. 78 d. 127 e The binary compound PCl 3 is called a. phosphorus chloride b. triphosphorus chloride c. monophosphorus trichloride d. phosphorus trichloride 17. The correct formula for ammonium sulfate is a. NH 4 SO 3 b. NH 4 SO 4 c. (NH 4 ) 2 SO 3 d. (NH 4 ) 2 SO 4 e. (NH 3 ) 2 SO The name of the BrO - 3 ion is a. bromate ion b. bromite ion c. hypobromite ion d. perbromate ion e. bromoxide ion

5 19. The name for MnBr 2 is a. manganese(ii) bromide b. manganese(i) bromide c. magnesium bromide d. manganese bromide e. manganese(iii) bromide 20. The name for Al(OH) 3 is a. aluminum(iii) hydroxide b. aluminum trihydroxide c. aluminum hydroxide d. monaluminum trihydroxide e. aluminum(i) hydroxide 21. The name for Ba(NO 3 ) 2 is a. barium dinitrate b. barium(ii) nitrate c. barium nitrite d. barium(i) nitrate e. barium nitrate ANS: E 22. The name for PCl 5 is. ANS: phosphorus pentachloride 23. The name for N 2 O is. ANS: dinitrogen monoxide 24. When the following equation is balanced using the smallest possible integers, what is the number in Sn + NaOH Na 2 SnO 2 + H 2 a. 1 b. 2 d. 4 e. 5

6 25. When the following equation is balanced using the smallest possible integers, what is the number in Na 2 S 2 O 3 + I 2 NaI + Na 2 S 4 O 6 a. 1 b. 2 d. 4 e When the following equation is balanced using the smallest possible integers, what is the number in Pb(NO 3 ) 2 + K 2 CO 3 PbCO 3 + KNO 3 a. 5 b. 4 d. 2 e When the following equation is balanced using the smallest possible integers, what is the number in Al + Fe 3 O 4 Al 2 O 3 + Fe a. 1 b. 3 c. 6 d. 9 e When the following equation is balanced using the smallest possible integers, what is the number in CH 3 OH + O 2 CO 2 + H 2 O a. 1 b. 2 d. 4 e. 6

7 29. When the following equation is balanced using the smallest possible integers, what is the number in P 4 O 10 + H 2 O H 3 PO 4 a. 10 b. 6 c. 4 d. 2 e. 1 ANS: E 30. When the following equation is balanced using the smallest possible integers, what is the number in NO 2 + H 2 O HNO 3 + NO a. 1 b. 2 d. 4 e When the following equation is balanced using the smallest possible integers, what is the number in MnO 2 + HCl MnCl 2 + Cl 2 + H 2 O a. 5 b. 4 d. 2 e. 1

8 32. When the following equation is balanced using the smallest possible integers, what is the number in PCl 5 + H 2 O H 3 PO 4 + HCl a. 1 b. 2 d. 4 e. 5 ANS: E 33. How many atoms of calcium are present in 58.2 g of calcium? a b d A 30.5-g sample of Ca contains how many calcium atoms? a atoms b atoms c atoms d atoms e atoms 35. Calculate the mass of atoms of silver. a g b g c g d g

9 g of Pt represents how many atoms? a atoms b atoms c atoms d atoms 37. A sample containing mol of sodium has a mass of g. a b c d e A 3.37-mol sample of aluminum represents how many atoms? a atoms b atoms c atoms d atoms 39. A 7.11-g sample of potassium chlorate was decomposed according to the following equation: 2KClO 3 2KCl + 3O 2 How many moles of oxygen are formed? A) 2.78 g B) mol C) mol D) mol

10 40. Consider the following reaction: What mass of CCl 4 is formed by the reaction of 5.14 g of methane with an excess of chlorine? A) 12.3 g B) 0.54 g C) 791 g D) 49.3 g 41. Nitric oxide, NO, is made from the oxidation of NH 3, and the reaction is represented by the equation: 4NH 3 + 5O 2 4NO + 6H 2 O What mass of NO can be produced from 7.55 g of NH 3? A) 4.28 g NO B) 13.3 g NO C) 7.55 g NO D) 20.0 g NO E) 16.6 g NO 42. Nitric oxide, NO, is made from the oxidation of NH 3, and the reaction is represented by the equation: 4NH 3 + 5O 2 4NO + 6H 2 O What mass of O 2 would be required to react completely with 6.85 g of NH 3? A) 4.56 g O 2 B) 10.3 g O 2 C) 8.04 g O 2 D) 16.1 g O 2 E) 12.9 g O For the reaction P 4 O 10 (s) + 6H 2 O(l) 4H 3 PO 4 (aq), what mass of P 4 O 10 must be consumed if molecules of H 2 O are also consumed? A) g P 4 O 10 B) 29.1 g P 4 O 10 C) 175 g P 4 O 10 D) 1.85 g P 4 O 10 E) 66.6 g P 4 O 10

11 44. Phosphoric acid can be prepared by reaction of sulfuric acid with phosphate rock according to the equation: Ca 3 (PO 4 ) 2 + 3H 2 SO 4 3CaSO 4 + 2H 3 PO 4 Suppose the reaction is carried out starting with 129 g of Ca 3 (PO 4 ) 2 and 97.4 g of H 2 SO 4. Which substance is the limiting reactant? A) Ca 3 (PO 4 ) 2 B) H 2 SO 4 C) CaSO 4 D) H 3 PO Suppose the reaction Ca 3 (PO 4 ) 2 + 3H 2 SO 4 3CaSO 4 + 2H 3 PO 4 is carried out starting with 153 g of Ca 3 (PO 4 ) 2 and 76.8 g of H 2 SO 4. How much phosphoric acid will be produced? A) 76.7 g B) 51.1 g C) g D) g E) 96.7 g 46. SO 2 reacts with H 2 S as follows: 2H 2 S + SO 2 3S + 2H 2 O When 7.50 g of H 2 S reacts with g of SO 2, which statement applies? A) 6.38 g of sulfur are formed. B) 10.6 g of sulfur are formed. C) moles of H 2 S remain. D) 1.13 g of H 2 S remain. E) SO 2 is the limiting reagent. 47. Consider the following reaction: What mass of CCl 4 will be formed if 1.20 moles of methane react with 1.11 moles of chlorine? A) 185 g B) 171 g C) 683 g D) 42.7 g E) 19.7 g

12 48. The electron configuration for the barium atom is: A) 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 B) [Xe]6s 2 C) 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 D) 1s 2 2s 2 2p 6 3s 2 3p 6 4s The electron configuration for the carbon atom is: A) 1s 2 2s 2 2p 2 B) [He]2s 4 C) [Ne]2s 2 2p 2 D) 1s 2 2p All alkaline earths have the following number of valence electrons: A) 1 B) 3 C) 6 D) Order the elements S, Cl, and F in terms of increasing ionization energy. A) S, Cl, F B) Cl, F, S C) F, S, Cl D) F, Cl, S E) S, F, Cl 52. Order the elements S, Cl, and F in terms of increasing atomic radii. A) S, Cl, F B) Cl, F, S C) F, S, Cl D) F, Cl, S E) S, F, Cl

13 53. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 2 is the correct electron configuration for which of the following atoms? A) Ca B) Ti C) Ge D) Zr 54. Which of the following compounds contains only one unshared pair of valence electrons? A) NH 3 B) H 2 O C) CH 4 D) NaCl E) BF Which of the following Lewis structures best describes BF 3? A) B) C) D) E)

14 56. The molecular structure of OF 2 is A) pyramidal B) none of these C) octahedral D) trigonal planar E) V-shaped ANS: E 57. NI 3 A) pyramidal B) tetrahedral C) square planar D) octahedral 58. SiH 4 A) pyramidal B) tetrahedral C) square planar D) octahedral 59. The molecular structure of NCl 3 is A) pyramidal B) none of these C) octahedral D) trigonal planar E) bent 60. A 16.4-g sample of HF is dissolved in water to give ml of solution. The concentration of the solution is: A) 0.82 M B) 0.16 M C) 0.08 M D) 4.1 M E) 8.2 M

15 61. A 38.1-g sample of SrCl 2 is dissolved in ml of solution. Calculate the molarity of this solution. A) 27.0 M B) 2.14 M C) 53.7 M D) M 62. You mix 55 ml of 1.00 M silver nitrate with 25 ml of 0.84 M sodium chloride. What mass of silver chloride should you form? A) 3.0 g B) 6.0 g C) 3.3 g D) Calculate the [H + ] in a solution that has a ph of A) 4.1 M B) 9.9 M C) M D) M 64. Calculate the [H + ] in a solution that has a ph of A) 2.7 M B) 11.3 M C) M D) M 65. Calculate the [H + ] in a solution that has a ph of A) M B) M C) M D) M E) M

16 66. The ph of a solution at 25 C in which [OH ] = M is: A) 4.41 B) 3.90 C) 9.59 D) You fill a balloon with 2.50 moles of gas at 22 C at a pressure of 1.62 atm. What is the volume of the balloon? A) 15.7 L B) 98.0 L C) 37.4 L D) 2.79 L E) 22.4 L 68. What volume is occupied by 21.0 g of methane (CH 4 ) at 27 C and 1.25 atm? A) 37.2 L B) 25.8 L C) 2.32 L D) L E) not enough data to calculate 69. Gaseous C 2 H 4 reacts with O 2 according to the following equation: What volume of oxygen gas at STP is needed to react with 5.75 mol of C 2 H 4? A) 17.3 L B) 42.9 L C) L D) L E) Not enough information is given to solve the problem.

17 70. Given the equation: A 3.00-g sample of KClO 3 is decomposed and the oxygen at 24.0 C and atm is collected. What volume of oxygen gas will be collected assuming 100% yield? A) ml B) ml C) ml D) ml

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