Chemistry Semester Exam Practice
1. The number that has five significant figures is
A. 23 410 B. 0.00652 C. 0.01783 D. 10.292
2. In division and multiplication, the answer must not have more significant figures than the A. number in the calculation with fewest significant figures.
B. number in the calculation with most significant figures. C. average number of significant figures in the calculation. D. total number of significant figures in the calculation.
3. Using the same balance, a chemist obtained the values 5.224 g, 5.235 g, and 5.25 g for the mass of a sample. These measurements have
A. good precision. B. good accuracy. C. poor precision. D. poor accuracy.
4. Five darts strike at the center of the target. Whoever threw the darts is
A. accurate. B. precise.
C. both accurate and precise. D. neither accurate nor precise. 5. The SI base unit for length is the
A. meter. B. millimeter. C. centimeter. D. kilometer.
6. The most appropriate SI unit for measuring the length of an car is the A. centimeter. B. kilometer. C. meter. D. liter. 7. The measurement that has been expressed to three significant figures is
A. 0.052 g. B. 0.202 g. C. 3.065 g. D. 5000 g.
8. The number of significant figures in the measured value 0.00320 g is A. 2. B. 3. C. 5. D. 6.
9. What is 0.002360 kg/min in lb/s? 1 kg = 2.20 lb. A. 1.788 x 10 -5
B. 0.3115 C. 8.653 x 10 -5 D. 9.212 x 10 -5
10. What is the mass of a substance A if its density is 85.23 g/mL and it's volume is 0.1145 mL? A. 9.7598 g
B. 744.4 g C. 0.001343 g D. 9.759 g
11. A nuclear particle that has about the same mass as a proton, but with no electrical charge, is called a(n)
A. Electron B. proton C. neutron D. isotope
12. Which of the following is NOT true about the nucleus of an atom: A. it is positively charged
B. it is very dense
C. it contains most of the volume of an atom D. it contains most of the mass of an atom 13. An atom is electrically neutral because
A. the number of electrons and protons are equal B. the number of neutrons and electrons are equal C. the number of neutrons and protons are equal D. it is magic
14. What do the atomic masses in parentheses mean?
A. They haven’t been found. B. Radioactive C. Multiple elements 15. Horizontal rows on the periodic table are called?
A. Groups B. Families C. Periods D. A & B
Chemistry Practice Exam Answers
1 D 16 C 31 D 46 C 61 C 76 B 91 B
2 A 17 E 32 A 47 A 62 A 77 A 92 B
3 A 18 A 33 A 48 C 63 D 78 B 93 C
4 C 19 A 34 C 49 B 64 A 79 C 94 C
5 A 20 B 35 B 50 d 65 C 80 C 95 B
6 C 21 B 36 D 51 B 66 D 81 A 96 A
7 B 22 A 37 A 52 C 67 A 82 B 97 C
8 B 23 C 38 B 53 B 68 A 83 A 98 B
9 C 24 C 39 D 54 B 69 B 84 C 99 C
10 D 25 D 40 D 55 D/C 70 A 85 C 100 A 11 C 26 A 41 C 56 A 71 B 86 D
16. What is the average atomic mass for element “G” where 56.54% has a mass of 99.101 amu, 32.4% has a mass of 101.45 amu, and 11.06% has a mass of 97.745 amu?
A. 99.432 amu B. 98.452 C. 99.712 amu 17. The nucleus contains
A. electrons B. neutrons C. protons D. BOTH A and B E. BOTH B and C 18. The periodic table was created by
A. Mendeleev B. Einstein C. Dickson D. Bob 19. Name the element with 45 neutrons that is a halogen
A. Bromine B. Iodine C. Chlorine D. Selenium E. Krypton 20. How many electrons does Li +1 have:
A. 1 B. 2 C. 3 D. 4 E. 5
21. The number of atoms in 1 mol of carbon is
A. 6.022 x 10-23 B. 6.022 x 1023 C. 1.66 x 10-24D. 1.66 x 1024
22. What is the atomic number for aluminum? A. 13 B. 14 C. 26.98 D. 27
23. What is the name of the element that contains 4 electrons and 5 neutrons A. fluorine B. boron C. beryllium D. need more information 24. Argon contains
A. 22 electrons B. 22 protons C. 22 neutrons D.18 neutrons
25. An iron isotope consists of 26 protons, 26 electrons, and 32 neutrons. Its mass number is A. 26 B. 32 C. 52 D. 58
26. Which is true about Sodium:
A. mass number 23, 11 protons, 11 electrons, 12 neutrons B. mass number 22, 11 protons, 11 electrons, 12 neutrons C. mass number 23, 11 protons, 11 electrons, 11 neutrons D. mass number 22, 12 protons, 12 electrons, 11 neutrons 27. The molar mass of magnesium is
A. 12 g. B. 24 g. C. 6.022 x 1023 g. D. 36 g.
28. The molar mass of H2O is
A. 3 g. B. 6.022 x 1023 g. C. 36 g. D. 18 g.
29. If an element has an octet of electrons in its highest main energy level, there are ____ electrons in this level.
A. 2 B.8 C. 10 D. 32
30. The electron in a hydrogen atom has its lowest total energy when the electron is in its A. natural state B. excited state C. ground state D. quantum state
31. For electromagnetic radiation, c (the speed of light) equals
A. Frequency minus wavelength B. frequency divided by wavelength C. frequency plus wavelength D. frequency times wavelength 32. What is the electron configuration for nitrogen, atomic number 7?
A. 1s2 2s2 2p3 B. 1s2 2s3 2p2 C.1s2 2s3 2p1 D. 1s2 2s2 2p2 3s1
33. The orbital with the sphere shape is: A. s B. d C. p D. f
34.The p orbitals are shaped like
A. Electrons B. circles C. dumbbells D. spheres
35. The letter designations for the first four sublevels with the maximum number of electrons that can be in each sublevel are
A. s:4, p:5, d:10, and f:14 B. s:2, p:6, d:10, and f:14 C. s:1, p:3, d:5, and f:7 D. s:4, p:7, d:18, and f:32 36. How many electrons are needed to fill the third energy level?
A. 3 B. 4 C. 6 D. 8
37. If electrons in an atom have the lowest possible energies, the atom is in the A. Ground state B. Inert state
C. excited state D. radiation – emitting state 38. Gamma rays have the highest wavelength.
A. True B. False
39. Mendeleev predicted that the spaces in his periodic table represented
a. isotopes. c. permanent gaps.
b. radioactive elements. d. undiscovered elements.
a. atomic mass. c. radioactivity.
b. density. d. atomic number.
41. What are the radioactive elements with atomic numbers from 90 to 103 in the periodic table called?
a. the noble gases c. the actinides
b. the lanthanides d. the rare-earth elements
42. What are the elements with atomic numbers from 58 to 71 in the periodic table called? a. the lanthanide elements c. the actinide elements
b. the noble gases d. the alkali metals
43. Argon, krypton, and xenon are
a. alkaline earth metals. c. actinides.
b. noble gases. d. lanthanides.
44. Which two periods have the same number of elements?
a. 2 and 4 c. 4 and 5
b. 3 and 4 d. 5 and 6
45. Elements in a group or column in the periodic table can be expected to have similar
a. atomic masses. c. numbers of neutrons.
b. atomic numbers. d. properties.
46. The atomic number of lithium, the first element in Group 1, is 3. The atomic number of the second element in this group is
a. 4. c. 11.
b. 10. d. 18.
47. Krypton, atomic number 36, is the fourth element in Group 18. What is the atomic number of xenon, the fifth element in Group 18?
a. 54 c. 72
b. 68 d. 90
48. Barium, atomic number 56, is the fifth element in Group 2. What is the atomic number of radium, the next element in Group 2?
a. 64 c. 88
b. 74 d. 103
49. The electron configuration of aluminum, atomic number 13, is [Ne] 3s2 3p1. Aluminum is in Period
a. 2. c. 6.
b. 3. d. 13.
50. Identify the sublevels in a period that contains 32 elements.
a. s, f c. s, p, d
b. s, p d. s, p, d, f
51. How many elements are in a period in which only the s and p sublevels are filled?
a. 2 c. 18
b. 8 d. 32
52. In Period 3 there are 8 elements. What sublevel(s) is (are) being filled?
a. s c. s and p
b. s and d d. d and f
53. Period 4 contains 18 elements. How many of these elements have electrons in the d sublevel?
a. 8 c. 16
b. 10 d. 18
54. The number 20, has the electron configuration [Ar] 4s2. In what period is calcium?
a. Period 2 c. Period 8
b. Period 4 d. Period 20
55. Neutral atoms with an s2p6 electron configuration in the highest energy level are best classified as
a. metalloids. c. nonmetals.
b. metals. d. gases.
56. Strontium's highest occupied energy level is 5s2. To what group does strontium belong?
a. Group 2 c. Group 6
b. Group 4 d. Group 8
57. Titanium, atomic number 22, has the configuration [Ar] 3d2 4s2. To what group does titanium
belong?
a. Group 2 c. Group 4
b. Group 3 d. Group 5
58. Nitrogen's electron configuration is 1s2 2s2 2p3. To what group does nitrogen belong?
b. Group 7 d. Group 17
59. Bromine, atomic number 35, belongs to Group 17. How many electrons does bromine have in its outermost energy level?
a. 7 c. 18
b. 17 d. 35
60. The elements in Group 1 are also known as the
a. alkali metals. c. Period 1 elements.
b. rare-earth series. d. actinide series. 61. The most reactive group of the nonmetals are the
a. lanthanides. c. halogens.
b. transition elements. d. rare-earth elements. 62. Compared to the alkali metals, the alkaline-earth metals a. are less reactive. c. are less dense.
b. have lower melting points. d. combine more readily with nonmetals.
63. The energy required to remove an electron from an atom is the atom's a. electron affinity. c. electronegativity.
b. electron energy. d. ionization energy.
64. One-half the distance between the nuclei of identical atoms that are bonded together is called the
a. atomic radius. c. atomic volume.
b. atomic diameter. d. electron cloud.
65. A positive ion is known as a(n)
a. ionic radius. c. cation.
b. valence electron. d. anion
66. A negative ion is known as a(n)
a. ionic radius. c. cation.
b. valence electron. d. anion.
67. In a row in the periodic table, as the atomic number increases, the atomic radius generally
a. decreases. c. increases.
b. remains constant. d. becomes unmeasurable. 68. Across a period in the periodic table, atomic radii
a. gradually decrease.
b. gradually decrease, then sharply increase. c. gradually increase.
d. gradually increase, then sharply decrease.
69. Which of the following is a bond that does not conduct electricity: A. ionic B. covalent C. metallic
70. Which of the following is a bond that transfers an electron from one element to another: A. ionic B. covalent C. metallic
71. Which type of bond shares electrons: A. ionic B. covalent C. metallic
72. Which of the following is true about the Lewis Dot diagram for S:
A. it has 3 dots B. it has 8 dots C. it has 5 dots D. it has 6 dots 73. Which of the following is true about the Lewis Dot diagram for Be:
A. it has 2 dots B. it has 3 dots C. it has 8 dots D. it has 4 dots 74. Which of the following is true about the Lewis Dot diagram for H:
A. it has 1 dots B. it has 7 dots C. it has 8 dots D. it has 2 dots 75. What type of intermolecular force contributes to the high boiling point of water?
A. London dispersion force B. Hydrogen bonds
C. Ionic
76. Use the charts below and to the right to choose which type of bond H and Cl is: A. ionic B. polar-covalent C.nonpolar covalent
77. Use the charts below and to the right to choose which type of bond Mg and N is: A. ionic B. polar-covalent C.nonpolar covalent
78. Use the charts below and to the right to choose which type of bond F and I is: A. ionic B. polar-covalent C.nonpolar covalent
0.0 – 0.3 Non Polar Covalent 0.31 – 1.69 Polar Covalent
1.7 – 3.3 Ionic
80. An example of a chemical change is
A. sanding wood. B. freezing water C. milk going sour. D. vaporizing gasoline 81. The particles in a solid are
A. packed closely together. B. very far apart.
C. constantly in motion.
D. able to slide past each other
82. A horizontal row of blocks in the periodic table is called a(n) A. group.
B. period. C. octet. D. family.
83. All vertical columns in the periodic table are called a(n) A. group.
B. period. C. family. D. both a and c
84. The elements that border the zigzag line in the periodic table are A. noble gases
B. metals. C. metalloids. D. nonmetals.
85. Which is NOT a property of metals? A. malleability
B. ability to conduct heat and electricity C. unreactivity
D. tensile strength
86. Elements in a group in the periodic table can be expected to have similar A. atomic masses.
B. atomic numbers C. numbers of neutrons.
2. 1 H 1. 0 Li 1. 5 Be 2. 0 B 2. 5 C 3. 0 N 3. 5 O 4.0 F 1. 0 Na 1. 2 M g 1. 5 Al 1. 8 Si 2. 1 P 2. 5 S 3.0 Cl 0. 9 K 1. 0 Ca 1. 3 Sc 1. 4 Ti 1. 5 V 1.6Cr
1.6 M n 1. 7 Fe 1. 7 Co 1. 8 Ni 1. 8 Cu 1. 6 Zn 1. 7 Ga 1. 9 Ge 2. 1 As 2. 4 Se 2.8 Br 0. 9 Rb 1. 0 Sr 1. 2 Y 1. 3 Zr 1. 5 Nb 1.6 Mo 1.7Tc
D. properties.
Use the following diagram to answer questions 87-88. There may be more than one answer.
87. The homogeneous mixture in the illustration above is in container(s) 88. The heterogeneous mixture is in container(s)
89. The state of matter in which a material has neither a definite shape nor a definite volume is the A. gaseous state.
B. solid state. C. liquid state. D. both a and c
90. The state of matter in which a material has a definite volume but no definite shape is the A. gaseous state.
B. solid state. C. liquid state
91 . Which of the following should be used to get an exact amount of a liquid: A. a beaker B. a graduated cylinder C. a test tube D. an evaporating dish 92. Which of the following should not be used for mixing or heating:
A. beaker B. a graduated cylinder C. a test tube D. a flask 93. What is used to hold a crucible?
A. scale B. Watch glass C. Clay triangle
94. What is this called?
A. Beaker B. Graduated Cylinder C. Flask
Use the following information for 95 – 100 1 mol = 6.022 X 1023 atom = molar mass (g)
95. How many moles are in 7 g of Na? A. 98 mol B. 0.3 mol C. 2 mol 96. How many atoms are in 12 moles of Mg?
A. 7.3 x 10 24A B. 2.9 X 1023 atoms C. 4.9 X 10-22 atoms D. 3.0X1024 atoms
97. How many grams are in 7.02 X 1023 atoms of Sc?
A. 9.4 X 1045 g B. 5.25 X 1047 g C. 52.5 g
A. 0.069 g B. 363 g C. 14 g
99. How many moles are in 6.78 X 1023 atoms of Zn?
A. 8.14 X 1025 mol B. 73.6 mol C. 1.13 mol
100. How many atoms in 12 g of C?
A. 6.022 X 1023 atoms B. 1 atom C. 24 atoms
