Questions+on+chapter 1

Questions on
Chapter 2
(Choose and mark the correct answer)

1- The scientist who determined the magnitude of the electric charge of the electron was
a- John Dalton. b- Robert Millikan. c- J. J. Thomson. d- R. Chang.

2- The scientist who determined the ratio of electric charge to the mass of an individual
electron was
a- John Dalton. b- Robert Millikan c- J. J. Thomson. d- R. Chang.

3- When J. J. Thomson discovered the electron, what physical property of the electron did
he measure?
a- its charge, e b- its charge-to-mass ratio, e/m
c- its mass, m d- its atomic number, Z

4- The scientist who developed the nuclear model of the atom was
a- James Chadwick. b- Robert Millikan. c- J. J. Thomson. d- Ernest Rutherford

5- The scientist who discovered the neutron was
a- James Chadwick. b- Robert Millikan. c- J. J. Thomson. d- Ernest Rutherford

6- Rutherford's experiment with alpha particle scattering by gold foil established that
a- protons are not evenly distributed throughout an atom.
b- electrons have a negative charge.
c- atoms are made of protons, neutrons, and electrons.
d- protons are 1840 times heavier than electrons.

7- How many protons and electrons are present in one Br- ion?
a- 35 p, 35 e b- 80 p, 81 e c- 35 p, 34 e d- 35 p, 36 e

8- How many neutrons are there in an atom of lead whose mass number is 208?
a- 82 b- 126 c- 208 d- none of them

1

9- An atom of the isotope sulfur-31 consists of how many protons, neutrons, and
electrons? (p = proton, n = neutron, e = electron)
a- 15 p, 16 n, 15 e b- 16 p, 15 n, 16 e c- 16 p, 31 n, 16 e d-16 p, 16 n, 15 e

10- Give the number of protons (p), electrons (e), and neutrons (n) in one atom of chlorine-
37
a- 37 p, 37 e, 17 n b- 17 p, 17 e, 37 n c- 17 p, 17 e, 20 n d- 37 p, 17 e, 20 n

11- A magnesium ion, Mg2+, has
a- 12 p and 13 e b- 24 p and 26 e c- 12 p and 10 e d- 12 p and 14 e

12- An aluminum ion, Al3+, has:

13- An oxide ion, O2-, has:

14- A sulfide ion, S2- , has:

15- What is the number of protons (p) and electrons (e-) in Na+?
a- 11 p, 10 e- b- 8 (p), 10 e- c- 12 (p), 10 e- d- 9 (p), 10 e-

16- The number of neutrons (n) and protons (p) in the element zinc ( 30 Zn 2+ ) is:
65

a- 30 n, 28 p b- 35 n, 30 p c- 31 n, 30 p d- 35 n, 28 p

17- The number of protons (p) and electrons (e) in the element zinc ( 30 Zn 2+ ) is:
65

a- 30 p, 28 e b- 35 n, 30 p c- 31 n, 30 p d- 35 n, 28 p

18- What is the appropriate symbol for the isotope Z = 11, A = 23?
34 23 23 23
a- 23 V b- 12 Mg c- 11 Na d- 11 V

19- What is the appropriate symbol for the isotope Z = 28, A = 64?
28 64 64 64
a- 64 Ni b- 28 Kr c- 28 Gd d- 28 Ni

20- The appropriate symbol for the isotope with number of electrons = 11 and number of
neutrons = 12
59
a- 51 V
23 b- 24 Mg
12 c- 27 Co d- 23 Na
11

2

21- Use the following table and choose which of the species are neutral?

atom or ion of element A B C D E F G

Number of electrons (e-) 5 10 18 28 36 5 9

Number of protons (p) 5 7 19 30 35 5 9

Number of neutrons (n) 5 7 20 36 46 6 10

a- C and D b- C, D, E, F and G c- A, F and G d- B and E

22- Use the above table and choose which of the species are negatively charged?

23- Use the above table and choose which of the species are positively charged?

24- Use the above table and choose which of the species have larger number of neutrons
than protons?

25- The letter A in the chemical symbol ( A X c ) represents:
Z f

a- Atomic number b- mass number c- charge d- frequency

26- The letter Z in the chemical symbol ( A X c ) represents:
Z f


27- The letter c in the chemical symbol ( A X c ) represents:
Z f


28- The letter f in the chemical symbol ( A X c ) represents:
Z f


204
29- Which of the following is an isotope of 82 Pb ?
197 208 212 199
a- Tl
81 b- 80 Hg c- 82 Pb d- Tl
81

30- Atoms of the same element with different mass numbers are called
a- ions. b- neutrons. c- isotopes. d-chemical families.
3

31- Atoms which have the same number of electrons and number of protons are called
a- ions. b- neutral atoms c- isotopes. d- different atoms.

32- Atoms which have different number of electrons than number of protons are called
a- ions. b- neutral atoms c- isotopes. d- different atoms

33- Atoms which have different number of protons are called

34- Atoms with the same number of protons and with different number of neutrons are
called

35- Two isotopes of an element differ only in their
a- symbol. b- atomic number. c- atomic mass. d- number of protons.

107 109
36- Silver occurs in nature as a mixture of two isotopes: 47 Ag and 47 Ag . The number of
protons in both isotopes ( 107 Ag and
47
109
47 Ag ) is:
107
a- the same b- bigger in isotope 47 Ag
107
c- smaller in isotope 47 Ag d- none of the above

107 109
electrons in both isotopes ( 107 Ag and
47
109
47 Ag ) is:
107
107

107 109
neutrons in both isotopes ( 107 Ag and
47
109
47 Ag ) is:
107
107

107 109
39- Silver occurs in nature as a mixture of two isotopes: 47 Ag and 47 Ag . The mass number
in both isotopes ( 107 Ag and
47
109
47 Ag ) is:
107
107

4

40- In which one of the following pairs do the two species resemble each other most closely
in chemical properties?
+
1 1
a- 1 H and 1 H b-
14
7 N and 14
7 N 3− 12 13
c- 6 C and 6 C
23
d- 11 Na and
23
11 Na +

41- An anion is defined as
a- a charged atom or group of atoms with a net negative charge.
b- a stable atom.
c- a group of stable atoms.
d- an atom or group of atoms with a net positive charge.

42- Which one of these species is an ion?
a- B3+ b- NaCl c- He d- 14
C

43- The elements in a column of the periodic table are known as
a- metalloids. b- a period. c- a group. d- noble gases.

44- Which of these materials are usually poor conductors of heat and electricity?
a- metalloids. b- metals c- nonmetals d- alkali metals

45- Which of these elements is most likely to be a good conductor of electricity?
a- N b- S c- He d- Fe

46- Which of these elements is chemically similar to magnesium?
a- sulfur b- calcium c- iron d- nickel

47- Which of these elements is chemically similar to oxygen?
a- sulfur b- calcium c- iron d- nickel

48- Which pair of compounds has the same empirical formula?
a- C2H6O3 and CH2O b- NO2 and N2O4 c- C6H6and CH4 d- NO2 and NO4

49- What is the empirical formula of C6H6?
a- C6O b- CH6 c- C3H3 d- CH

50- What is the empirical formula of P4O10?
a- P4O5 b- P2O5 c- PO d- PO5

5

51- What is the empirical formula of N2O5?
a- N2O5 b- NO c- NO5 d- N2O

52- Which of these pairs of elements would be most likely to form an ionic compound?
a- P and Br b- Cu and K c- C and O d- O and Zn

53- Which pair of elements would be most likely to form an ionic compound?
a- P and Br b- Zn and K c- F and Al d- C and S

54- What is the formula for the ionic compound formed by calcium ions and nitrate ions?
a- Ca3N2 b- Ca(NO3)2 c- Ca2NO3 d- Ca2NO2

55- What is the formula for the ionic compound formed by magnesium and iodine?
a- MgI b- Mg2I c- MgI2 d- MgI3

56- Which is the correct formula for copper(II) phosphate?
a- Cu2PO4 b- Cu3(PO4)2 c- Cu2PO3 d- Cu(PO4)2

57- The formula for magnesium sulfate is
a- MnS b- MgS c- MgSO4 d- MnSO3

58- The formula for sodium sulfide is
a- NaS b- NaS2 c- K2S d- Na2S

59- The correct name for NO2 is
a- nitrogen dioxide b- dinitrogen oxide
c- nitrogen oxide d- dinitrogen monoxide

60- The correct name for N2O is
a- nitrogen dioxide b- dinitrogen oxide
c- nitrogen oxide d- dinitrogen monoxide

61- The correct name for SO2 is
a- sulfur oxide b- sulfur dioxide
c- sulfur trioxide d- monosulfur dioxide

62- The correct name for N2O3 is
a- nitrogen trioxide b- dinitrogen trioxide
c- nitrogen oxide d- dinitrogen oxide
6

63- The correct name for Al2O3 is
a- aluminum trioxide b- dialuminum trioxide
c- aluminum oxide d- dialuminum oxide

64- The correct name for K2O is
a- potassium dioxide b- dipotassium oxide
c- potassium oxide d- dipotassium monoxide

65- The correct name for PCl3 is
a- phosphorus chloride b- monophosphorus chloride
c- phosphorus trichloride d- monophosphorus trichloride

66- The correct name for AlCl3 is
a- aluminum chloride b- monoaluminum chloride
c- aluminum trichloride d- monoaluminum trichloride

67- The correct names for H2S and H2O are
a- dihydrogen sulfide and dihydrogen oxide b- hydrogen sulfide and water
c- hydrogen sulfide and hydrogen oxide d- dihydrogen sulfide and water

68- The correct names for PH3 and NH3 are
a-monophosphorous trihydride and mononitrogen trihydride
b- monophosphorous trihydride and ammonia
c- phosphorous trihydride and ammonia
d- phosphorous trihydride and nitrogen trihydride

69- The correct name for NH4NO3 is
a- ammonium nitrate b- ammonium nitrogen trioxide
c- ammonia nitrogen oxide d- hydrogen nitrate

70- The correct name for Ba(OH)2 is
a- barium hydroxide b- boron hydroxide
c- barium hydrogen oxide d- barium hydrate

71- The Stock system name for Mn2O7 is
a- manganese(II) oxide b- manganese(III) oxide
c- manganese(VII) oxide d- magnesium oxide

7

72- Which is the correct formula for lead(IV) chloride?
a- Pb4Cl b- PbCl2 c- PbCl3 d- PbCl4

73- The chemical formula for iron(II) nitrate is
a- Fe2(NO3)3 b- Ir(NO2)2 c- Fe2N3 d- Fe(NO3)2

74- The Stock system name for CrSO3 is
a- chromium sulfide b- chromium(II) sulfate
c- chromium(II) sulfite d- chromium(III) sulfite

75- The Stock system name for CrO3 is
a- chromium oxide b- chromium(II) oxide
c- chromium(III) trioxide d- chromium(VI) oxide

76- The Stock system name for Cr2O3 is
a- chromium(III) oxide b- dichromium trioxide
c- chromium(III) trioxide d- chromium(VI) oxide

8

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