1. Which of the following is the correct group number for the alkaline earth elements?
   1. 1A
   2. 2A
   3. 3A
   4. 6A
   5. 7A

2. Which of the following statements is not a part of Dalton’s atomic theory?
   1. Elements are composed of small particles called atoms.
   2. A given compound always has the same relative number and kind of different atoms.
   3. Chemical reactions do not change the identity of atoms.
   4. Atoms consist of positively charged protons, neutral neutrons, and negatively charged electrons.
   5. All atoms of an element are identical, different elements have different atoms.

3. Whose experiments led to the modern view of atomic structure, i.e. atoms contain a small, positively charged nucleus which is surrounded by electrons that fill most of the empty space around the nucleus?
   1. Thomson
   2. Rutherford
   3. Curie
   4. Dalton
   5. Einstein

4. How many neutrons does an atom of carbon-14 have?
   1. none
   2. 6
   3. 7
   4. 8
   5. 9

5. Which is the most stable ion of Be?
   1. Be^-2
   2. Be^-1
   3. Be
   4. Be⁺¹
   5. Be⁺²

6. Which is the correct name for FeO?
   1. Iron oxide
   2. Iron(II) oxide
   3. Iron(III) oxide
   4. Iron(I) ion
   5. Iron mono-oxygen

7. Which of the following is named incorrectly?
   1. OH^- ; hydroxide ion
   2. NO₃^- ; nitrate ion
   3. HBr ; hydrobromic acid
   4. KCl ; phosphorous chloride
   5. H⁺ ; hydrogen ion

8. Each of the following compounds are both molecular and empirical formulas except:
   1. H₂O
   2. CH₄
   3. P₄
   4. Fe₂O₃
   5. H₂SO₄

9. What is the charge of the stable sulfur anion?
   1. +1
   2. +2
   3. -1
   4. -2
   5. +6

10. What is the correct formula for iron(III) sulfate?
    1. Fe₂(SO₃)₃
    2. FeSO₄
    3. Fe₂(SO₄)₃
    4. Fe₃(SO₄)₂
    5. Fe₂SO₄

11. A substance
    1. has definite composition and distinct properties.
    2. is always a compound.
    3. is a mixture of known composition.
    4. is the fundamental building block of matter.
    5. is composed of two or more compounds.

12. The group 2A elements are the
    1. alkali metals
    2. halogens
    3. alkaline earth metals
    4. noble metals
    5. chalcogens

13. Which of the following is not a ray produced by radioactivity?
    1. alpha rays
    2. beta rays
    3. gamma rays
    4. cathode rays

14. Cathode rays are
    1. beams of protons
    2. beams of electrons
    3. beams of neutrons
    4. beams of alpha particles
    5. beams of x-rays

15. Isotopes are atoms of the same element that differ in
    1. the number of neutrons
    2. the number of protons
    3. the number of electrons
    4. the atomic number

16. How many neutrons are in the Ar-40 atom?
    1. 18
    2. 40
    3. 22
    4. 58
    5. cannot be determined with the information provided.

17. All of the following are characteristics of metals except:
    1. ductile
    2. malleable
    3. good conductors of heat and electricity
    4. solids at room temperature
    5. tend to form anions

18. All of the following are empirical formulas except:
    1. CH₄
    2. N₂O₅
    3. NH₃
    4. P₄O₁₀
    5. H₂O

19. The formula for the ionic compound composed of Ca²⁺ and N^3- is:
    1. CaN
    2. Ca₂N₃
    3. Ca₃N₂
    4. Ca₂N
    5. Ca₃N

20. The NO^2- ion is called the:
    1. nitride ion
    2. nitrate ion
    3. nitrogen dioxide ion
    4. nitrite ion
    5. nitrous ion

21. The H₂SO₃ acid is called
    1. sulfurous acid
    2. sulfuric acid
    3. hydrosulfuric acid
    4. sulfite acid
    5. hydrosulfurous acid

22. The discovery of the electron is attributed to
    1. Becquerel
    2. Millikan
    3. Rutherford
    4. Dalton
    5. Thomson

23. Which of the following statements is NOT true?
    1. Mixtures can be separated by physical processes while compounds cannot.
    2. Pure water is a compound but salt water is a mixture.
    3. Mixtures have definite chemical/physical properties, but compounds have variable chemical/physical properties.
    4. Mixtures have variable compositions while compounds have fixed composition.

24. What is the correct name for Ca(ClO₃)₂?
    1. calcium perchlorate
    2. calcium(II) chlorite
    3. calcium chromate
    4. calcium hypochlorite
    5. calcium chlorate

25. What would be the formula for the atom or ion that contains 18 electrons, 16 protons, and 16 neutrons?
    1. S^2-
    2. Ar
    3. S
    4. O^2-
    5. Se^2-

26. Which of the following are isotopes?
    1. ¹²⁵I and ¹²⁷I
    2. O and O^2-
    3. Na and K
    4. P^3- and P⁵⁺
    5. S and Cl

27. Which of the following is an ionic compound?
    1. SO₂(g)
    2. SiO₄(s)
    3. XeF₆(g)
    4. Brass (zinc + copper)
    5. FrF(s)

28. What would be the formula for the atom or ion that contains 18 electrons, 17 protons and 20 neutrons?
    1. ³⁵S^2-
    2. ³⁵Cl^-
    3. ³⁷Cl
    4. ³⁷Cl^-
    5. ³⁷Ar

29. Which of the following postulates of Dalton's atomic theory has been shown to be INCORRECT?
    1. In a chemical reaction, matter is neither created nor destroyed.
    2. When the atoms of different elements combine to form compounds, they combine in simple whole number ratios.
    3. Matter consists of particles called atoms.
    4. All atoms of the same element are identical in every way.
    5. Atoms of different elements differ in mass.

30. Which of the following species is a polyatomic cation?
    1. Mg²⁺
    2. S^2-
    3. Na⁺
    4. CO₃^2-
    5. NO₂⁺

31. Another name for the Group IA elements in the Periodic Table is:
    1. halogens.
    2. alkali metals.
    3. metalloids.
    4. alkaline earth metals.
    5. noble gases.

32. Which of the following is not a property of metals?
    1. They react with nonmetals to form other metals.
    2. They are the most common type of element.
    3. They conduct electricity.
    4. They are malleable.
    5. They are lustrous.

33. Which of the following is not a property of NaCl?
    1. It is a salt.
    2. It dissociates completely in water.
    3. A solution of NaCl conducts electricity.
    4. It has a low melting point.
    5. It is an example of an ionic compound.

34. Natural chlorine consists of ³⁵Cl and ³⁷Cl. Their atomic masses are 34.97 amu and 36.97 amu, respectively. The abundance of ³⁵Cl is:
    1. 24.0%
    2. 35.5%
    3. 50.0%
    4. 65.5%
    5. 76.0%

35. The correct name for Hg₂²⁺ is:
    1. mercury (I) ion.
    2. mercury ion.
    3. mercury (II) ion.
    4. hydrogen ion.
    5. hydrogen (II) ion.

36. Name the following compounds:

    	Fe(NO3)3	KBr	N2O3
    (a)	iron (III) nitrate	potassium bromate	dinitrogen oxide
    (b)	ferrous nitrate	potassium bromide	nitrogen oxide
    (c)	iron (III) trinitrate	potassium bromide	dinitrogen trioxide
    (d)	ferric trinitrate	potassium bromide	nitrogen oxide
    (e)	iron (III) nitrate	potassium bromide	dinitrogen trioxide

37. What is the symbol for an ion with 63 protons, 60 electrons, and 88 neutrons?
    1. Eu³⁺
    2. Sm²⁺
    3. Sm^2-
    4. Eu^2-
    5. Gd⁺

38. The name of SCl₄ is:
    1. sulfur monochloride.
    2. sulfur tetrachloride.
    3. sulfur trichloride.
    4. sulfur dichloride.
    5. sulfur tetrachlorite.

39. An unknown element, X, reacts with chlorine to form an ionic compound having the empirical formula XCl₃. If the ion X has 28 electrons, identify the element:
    1. Ga
    2. Kr
    3. Mn
    4. Ca
    5. Br

40. If an element is picked at random from the Periodic Table it most likely will be a:
    1. gas (at room temperature).
    2. liquid (at room temperature).
    3. non-metal.
    4. metal.
    5. halogen.

41. Na₃N is the formula of:
    1. sodium nitrogen.
    2. sodium nitride.
    3. sodium trinitride.
    4. sodium nitrate.
    5. sodium trinitrate.

42. Which of the following would have properties that are very different from the others?
    1. B
    2. Ba
    3. Be
    4. Bi
    5. Br

43. Which of the following is not a covalent compound?
    1. NaCl
    2. H₂O
    3. HI
    4. SO₂
    5. C₆H₁₂O₆

44. A radioactive isotope of iodine is used to treat people with Graves disease, a thyroid condition. Calculate the number of electrons in the following radioactive anion: ¹²⁵I^-.
    1. 52
    2. 53
    3. 54
    4. 72
    5. 125

45. Which of the following discoveries would be inconsistent with Dalton's theory of the atom?
    1. the existence of isotopes
    2. compounds of variable composition
    3. the loss of mass in a chemical reaction
    4. radioactive decay, in which an atom of one element is converted into an atom of another element
    5. all of the above

46. Which of the following are BOTH elements and gases at room temperature?

    1. Ar	6. Fe2O3
    2. CO	7. Na
    3. CH4	8. NaCl
    4. C10H22	9. Pt
    5. Cl2	10. S8

    1. 1 and 5
    2. 2 and 3
    3. 1, 5 and 7
    4. 1, 2, 3 and 5
    5. 1, 5, 7, 9 and 10

47. Which of the following is NOT expected to be a stable compound?
    1. Zn(OH)₂
    2. FeO
    3. Fe₂O₃
    4. NaOH
    5. Ca(OH)₃

48. What is the number of electrons, protons and neutrons in ¹⁶O^2-?
    1. 8 electrons, 16 protons, 16 neutrons
    2. 10 electrons, 8 protons, 8 neutrons
    3. 10 electrons, 9 protons, 9 neutrons
    4. 11 electrons, 9 protons, 9 neutrons
    5. 16 electrons, 8 protons, 2 neutrons

49. Natural copper consists of ⁶³Cu and ⁶⁵Cu. Their atomic masses are 62.93 amu and 64.93 amu, respectively. The abundance of ⁶³Cu is:
    1. 30.51%
    2. 63.00%
    3. 63.54%
    4. 65.00%
    5. 69.50%

50. Elemental ₅₁Sb consists of two stable isotopes ¹²¹Sb (57.25%) and ¹²³Sb (42.75%). Given the atomic weight of Sb listed on the attached Periodic Table, and the atomic mass of ¹²³Sb = 122.904 amu, the atomic mass of ¹²¹Sb is equal to:
    1. 120.9 amu
    2. 121.0 amu
    3. 121.8 amu
    4. 123.0 amu
    5. none of the above

51. Which of the following is an isotope of stable ⁹⁴Zr?
    1. stable ⁹³Nb
    2. radioactive ⁹⁴Nb
    3. radioactive ⁹⁷Zr
    4. radioactive ⁹⁴Y
    5. all of these

52. An unknown element reacts with bromine to form an ionic compound whose empirical formula is XBr₃. If ion X has 10 electrons, identify the element:
    1. Ne
    2. Mg
    3. Al
    4. Si
    5. P

53. Which row in the table below is INCORRECT?

    	Symbol	Protons	Neutrons	Electrons	Net Charge
    (a)	19F-	9	10	10	-
    (b)	23Na+	11	12	10	+
    (c)	35Cl-	17	18	18	-
    (d)	40Ca2+	20	20	18	2+
    (e)	137Ba2+	56	137	54	2+

54. Which formula does NOT match the name?
    1. Ba(OCl)₂ ; barium hypochlorite
    2. KI ; potassium iodide
    3. NaH₂PO₄ ; sodium dihydrogen phosphate
    4. NaClO₃ ; sodium perchlorate
    5. P₄O₁₀ ; tetraphosphorus decaoxide

55. Gold consists of only one stable isotope, ¹⁹⁷Au. The isotope mass must be numerically (in amu):
    1. 79.00
    2. 118.00
    3. 196.967
    4. 197.00
    5. none of these

56. The formula of magnesium bromide is:
    1. Mg(BrO₃)₂
    2. Mg(BrO₄)₂
    3. MgBr₂
    4. MgBrO₂
    5. Mg(BrO)₂

57. Which row in the table is INCORRECT?

    	Symbol	Protons	Neutrons	Electrons	Charge
    (a)	31P3-	15	16	18	3-
    (b)	35Cl-	17	18	18	1-
    (c)	40Ca2+	20	20	18	2+
    (d)	52Cr3+	24	28	27	3+
    (e)	59Ni2+	28	31	26	2+

58. The neutron number of ⁹⁴Zr is:
    1. 40
    2. 54
    3. 94
    4. 134
    5. a number that cannot be obtained from the data given.

59. Which of the following formulas is incorrect?
    1. BaO
    2. Al₂O₃
    3. MgCl₂
    4. PH₄
    5. none of these

60. Which row in the table is INCORRECT?

    	Symbol	Protons	Neutrons	Electrons	Charge
    (a)	79Se2-	34	45	36	2-
    (b)	107Ag+	47	60	46	1+
    (c)	55Mn	25	30	25	0
    (d)	51V2+	23	28	22	2+
    (e)	130I-	53	77	54	1-

61. Elemental Rb consists of two stable isotopes ⁸⁵Rb (72.16%) and ⁸⁷Rb (27.84%). Given the atomic weight of Rb listed on the attached Periodic Table, and the atomic mass of ⁸⁵Rb = 84.9117 amu, the atomic mass of ⁸⁷Rb is equal to:
    1. 84.91 amu
    2. 85.47 amu
    3. 86.92 amu
    4. 87.00 amu
    5. none of the above

62. You are given a valuable gift. It is a sample of a common substance - benzene, C₆H₆ - but it has been purified so that all the C atoms in it are ¹²C and all the H atoms in it are ²H. How many neutrons are present in a single molecule of this substance?
    1. 48
    2. 42
    3. 36
    4. 6
    5. 1

63. What is the chemical formula for baking soda (sodium bicarbonate)?
    1. NaHCO₃
    2. H₂CO₃
    3. NaCN
    4. Na₂CrO₄
    5. Na₂CO₃

64. Mothballs are made of naphthalene, an aromatic organic compound. The empirical formula for naphthalene is C₅H₄. The molecular weight for naphthalene is 128.1 g/mol. What is the molecular formula?
    1. C₅H₄
    2. C₁₀H₈
    3. C₁₂H₁₀
    4. C₁₅H₁₂
    5. C₆H₁₂O₆

65. How many electrons, protons, and neutrons are found in deuterium, the isotope of hydrogen which is used to make heavy water? The symbol for deuterium is ²H.
    1. 1 electron, 1 proton, 0 neutron
    2. 1 electron, 2 proton, 0 neutron
    3. 1 electron, 1 proton, 2 neutron
    4. 1 electron, 1 proton, 1 neutron
    5. 2 electron, 2 proton, 1 neutron

66. The atomic number of an element equals:
    1. number of neutrons in the nucleus.
    2. number of protons in the nucleus minus the number of electrons.
    3. number of electrons in an ion.
    4. number of protons + neutrons in nucleus.
    5. number of protons in the nucleus.

67. The law of constant composition applies to:
    1. solutions
    2. isotopes
    3. heterogeneous mixtures
    4. homogeneous mixtures
    5. compounds

68. All atoms of a given element have the same
    1. mass number
    2. number of neutrons
    3. number of protons and the same number of neutrons
    4. number of protons
    5. number of neutrons and the same number of electrons

69. Which is the formula of a compound formed between calcium ions and nitrogen ions?
    1. CaN
    2. Ca₂N₃
    3. Ca₃N₂
    4. CaN₂
    5. CaN₃

70. Which of the following formulas is incorrect?
    1. Na₂O
    2. BaCl
    3. CaCl₂
    4. AlCl₃
    5. Cl₂

Answers

1. B
2. D
3. B
4. D
5. E
6. B
7. D
8. C
9. D
10. C
11. A
12. C
13. D
14. B
15. A
16. C
17. E
18. D
19. C
20. D
21. A
22. E
23. C
24. E
25. A
26. A
27. E
28. D
29. D
30. E
31. B
32. A
33. D
34. E
35. A
36. E
37. A
38. B
39. A
40. D
41. B
42. E
43. A
44. C
45. E
46. A
47. E
48. B
49. E
50. A
51. C
52. C
53. E
54. D
55. D
56. C
57. D
58. B
59. D
60. D
61. C
62. B
63. A
64. B
65. D
66. E
67. E
68. D
69. C
70. B