PERIODIC TABLE

Chem-110, Final exam model Time: 2 hour

Name: Number: Section:

Useful information:

Speed of light, c = 3.0×10⁸ m/s Planck’s const., h = 6.626×10^-34 J.s Avogadro’s No., Nav = 6.022×10²³ mol^-1 Energy const. for H atom B = 2.179×10^-18 J Frequency const. for H atom B/h = 3.289×10¹⁵ s^-1 Mass of the electron, me = 9.11 x 10^-31 kg

Gas constant, R= 0.082 L atm K^-1 mol^-1 = 8.314 JK^-1mol^-1

(268)

Mt

Meitnerium

109 (265)

Hs

Hassium

108 (264)

Bh

Bohrium

107 (266)

Sg

Seaborgium

106 (262)

Db

Dubnium

105 (261)

Rf

Rutherfordium

104 (227)

Ac

Actinium

89 (226)

Ra

Radium

88 (223)

Fr

Francium

87

(222)

Rn

Radon

86 (210)

At

Astatine

85 (210)

Po

Polonium

84 209

Bi

Bismuth

83 207

Pb

Lead

82 204

Tl

Thallium

81 201

Hg

Mercury

80 197

Au

Gold

79 195

Pt

Platinum

78 192

Ir

Iridium

77 190

Os

Osmium

76 186

Re

Rhenium

75 184

W

Tungsten

74 181

Ta

Tantalum

73 178.5

Hf

Hafnium

72 139

La

Lanthanum

57 137

Ba

Barium

56 133

Cs

Cesium

55

131

Xe

Xenon

54 127

I

Iodine

53 128

Te

Tellurium

52 122

Sb

Antimony

51 119

Sn

50 Tin

115

In

Indium

49 112

Cd

Cadmium

48 108

Ag

Silver

47 106

Pd

Palladium

46 103

Rh

Rhodium

45 101

Ru

Ruthenium

44 (96)

Tc

Technetium

43 96

Mo

Molybdenum

42 93

Nb

Niobium

41 91

Zr

Zirconium

40 89

Y

Yttrium

39 86

Sr

Strontium

38 85.5

Rb

Rubidium

37

84

Kr

Krypton

36 80

Br

Bromine

35 79

Se

Selenium

34 75

As

Arsenic

33 72.5

Ge

Germanium

32 70

Ga

Gallium

31 65

Zn

Zinc

30 63.5

Cu

Copper

29 59

Ni

Nickel

28 59

Co

Cobalt

27 56

Fe

Iron

26 55

Mn

Manganese

25 52

Cr

Chromium

24 51

V

Vanadium

23 48

Ti

Titanium

22 45

Sc

Scandium

21 40

Ca

Calcium

20 39

K

Potassium

19

40

Ar

Argon

18 35.5

Cl

Chlorine

17 32

S

Sulfur

16 31

P

Phosphorus

15 28

Si

Silicon

14 27

Al

Aluminum

13 24

Mg

Magnesium

12 23

Na

Sodium

11

20

Ne

Neon

10 19

F

Flourine

9 16

O

Oxygen

8 14

N

Nitrogen

7 12

C

Carbon

6 11

B

Boron

5 9

Be

Beryllium

4 7

Li

Lithium

3

4

He

Helium

2 1

H

Hydrogen

1 Relative atomic mass to

nearest whole number

(262)

Lr

Lawrencium

103 (259)

No

Nobelium

102 (258)

Md

Mendelevium

101 (257)

Fm

Fermium

100 (252)

Es

Einsteinium

99 (251)

Cf

Californium

98 (247)

Bk

Berkelium

97 (247)

Cm

Curium

96 (243)

Am

Americium

95 244

Pu

Plutonium

94 237

Np

Neptunium

93 238

U

Uranium

92 231

Pa

Protactinium

91 232

Th

Thorium

90

175

Lu

Lutetium

71 173

Yb

Ytterbium

70 169

Tm

Thulium

69 167

Er

Erbium

68 165

Ho

Holmium

67 162.5

Dy

Dysprosium

66 159

Tb

Terbium

65 157

Gd

Gadolinium

64 152

Eu

Europium

63 150

Sm

Samarium

62 145

Pm

Promethium

61 144

Nd

Neodymium

60 141

Pr

Praseodymium

59 140

Ce

Cerium

58 12

C

Carbon

6

Key

Atomic number Symbol

PERIODIC TABLE

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1- The rate of effusion of methane (CH₄) gas to the ammonia (NH₃) gas is:

a- 17

16 b-

16

17 c-

16

17 d-

17 16

2- The atomic size increases in the periodic table from:

a- up to down b-

down to up c- from left to right d- none of the above

3- The hybridization of orbitals in the geometrical shape of an octahedron is:

a- sp² b-sp³ c- sp³ d¹ d- sp³ d²

4- The angle values of an octahedron are:

a- 180º + 30º b-180º + 60º c- 180º + 90º d- 180º + 120º

5- The equilibrium constant at (900ºC) equals (Kp = 1.3) for the following reaction:

CO (g) + H2O (g) equation-1

CO2 (g) + H2 (g)

K_p for the reaction equation-2{2 CO₂ (g) + 2 H₂ (g) 2 CO (g) + 2 H₂O (g)}

equation-2 equals:

a- K_p = 1.3 b- K_p = 1.7 c- K_p = 163.5 d- K_p = 96.2

6- According to the Valence shell Electron-Pair Repulsion theory the geometric shape of (XeF₄) is:

a- (square planar) b-(square pyramid) c- (irregular tetrahedron) d- (octahderon)

7- The concentration values for the following reaction will not change:

A (g) + B (g) C (g) + E (J) a- if temperature changes b-if pressure changes c- if volume changes d- none of the above

8- An increase of temperature for the reaction causes:

CaCO₃ (s) + 158 kJ CaO (s) + CO₂ (g)

a- increases in CaCO₃ only b- increases in CO2

c- increases in CaO only d- increases in CaO + CaCO3

9- A sample of a gas occupies (25 mL) at standard temperature and pressure (STP). What will be the temperature when the volume increases to (60 mL) and the pressure to (1900mmHg)?

a- 1638ºC b-1365ºC c- 1365K d- 45.5ºC

10- What is the number of grams of a gas with a molecular weight of (40.0 g/mol) at (273ºC) and a pressure of (3.50 atm) and a volume of 5000 mL)?

a- 31.27 g b- 15.62 g c- 15623 g d- 1.275 g

11- The number of sulfur's atom in (5.0 g) of (Na₂SO₄· 5 H₂O) is:

a- 158

5 x 2 x 6.02 x 10²³ b-

32

5 x 5 x 6.02 x 10²³

c- 232

5 x 6.02 x 10²³ d-

64

5 x 2 x 6.02 x 10²³

12- The kind of bonds in the chlorine molecule (Cl₂) and bromine molecule (Br₂) is:

a- covalent in chlorine molecule and ionic in bromine molecule b- covalent in chlorine molecule and covalent in bromine molecule c- covalent in bromine molecule and ionic in chlorine molecule d- ionic in bromine molecule and ionic in chlorine molecule

13- The maximum number of electrons the fourth level (n = 4) is:

a- 8 b- 16 c- 18 d- 32

14- Du Broglie Equation is:

a- λ

ν = c b- E = hv c- E = mc² d-

λ mv= h

15- If the equilibrium constant for reaction-1 SO₂ (g) +

2

1 O₂ (g) SO₃ (g) is (K_c = 4.0):

(K_c) for reaction-2 2 SO₂ (g) + O₂ (g)

^{2 SO}3 (g) is:

a- 2 b- 4 c- 8 d- 16

16- The possible quantum numbers for an electron in an atom is:

a- n = 3, ^l = 3, ml = 1, m_s = 1/2 b- n = 3, ^l = 2, ml = 3, m_s = 1/2 c- n = 3, llll = 2, m_llll = 2, m_s = 1/2 d- n = 3, ^l = 1, m_l = 2, m_s = 1/2

17- Which of the following is not an SI base unit?

a- kilometer b- kilogram c- second d- Kelvin

18- What is (5.6792 m + 0.6 m + 4.33 m) expressed in the correct units with the correct number of significant figures?

a- 10.6092 m b- 10.609 m c- 10.60 m d- 10.6 m

19- How many seconds are there in a solar year (365.24 days), expressed in the correct number of significant figures?

a- 3.1557 ^× 10⁸ s b- 3.1557 ×××× 10⁷ s c- 5.2595 ^× 10⁵ s d- 3.1 ^× 10⁷ s

20- The reaction below was studied at a high temperature. At equilibrium, the partial pressures of the gases are as follows: PCl5 = 1.4 10^-4 atm, PCl3 = 2.4 10^-2 atm, Cl2 = 3.0 10^-1 atm. What is the value of K_p for the reaction?

PCl5(g) PCl3(g) + Cl2(g)

a. 4.3 ^× 10^-4 b. 0.019 c. 0.32 d. 51 e. 2.3 10³

21. Aluminum is a lightweight metal (density = 2.70 g/cm³). What is its density in kg/m³?

a- 4.30 ^× 10³ kg/m³ b- 2.70 ^× 10⁴ kg/m³ c- 2.70 ×××× 10³ kg/m³ d- 8.2 ^× 10² kg/m³

22. Which of the following elements has a common ion with a 2+ charge?

a- Li b- Mg c- S d- I

23. What do we call atoms of the same elements with different mass numbers?

a- ^α particles b- isomers c- isotopes d- nuclei

24. Chalcopyrite, the principal ore of copper (Cu), contains 34.63 percent Cu by mass. How many grams of Cu can be obtained from 5.11 ×××× 10³ kg of the ore?

a- 147 kg b- 1.77 ×××× 10⁶ g c- 147 g d- 1.77 ^× 10⁴ g

25. The number of protons, neutrons, and electrons in (⁵⁹₂₈Ni²⁺) is:

a- 28 e⁻, 31 n, 28 p b- 28 e⁻, 31 n, 26 p c- 26 e⁻⁻⁻⁻, 31 n, 28 p d- 26 e⁻, 28 n, 28 p

26. The depletion of ozone (O₃) in the stratosphere has been a matter of great concern among scientists in recent years. It is believed that ozone can react with nitric oxide (NO) that is discharged from the high-altitude jet plane, the SST. The reaction is O₃ + NO → O₂ + NO₂

If 0.740 g of O₃ reacts with 0.670 g of NO, how many grams of NO₂ will be produced?

a- 1.410 g b- 0.670 g c- 0.709 g d- 0.493 g

27. The molecular weight of the empirical formula of a compound (C₅H₉O₃) is (117 g/mol), if the molecular weight of the compound is (234 g/mol), the molecular formula of the compound is:

a- C₉H₆O₆ b- C₁₀H₁₈O₆ c- C₉H₁₈O₂ d- C₆H₁₂O₆

28. The wavelength of an electromagnetic light with a frequency (νννν = 1.2 x 10¹⁵ s⁻⁻⁻⁻¹) is:

a- 250 nm b- 8.3 x 10⁻¹⁶ m c- 2.5 x 10⁻⁷ cm d- 250 Å

29. The number of grams of potassium hydroxide (KOH) (MW KOH = 56 g/mol) required to prepare a 400 mL of a 0.25 M (KOH)-solution are:

a- 12.4 g b- 89.8 g c- 5.6 g d- 8.981 g

30. The molecular weight of saccharin is 183.18 g/mol and the compound is 45.90% carbon, 2.75% hydrogen,26.20%oxygen,17.5%sulfur,and7.65% nitrogen.

Whatisthe empirical formula of saccharin?

a- C₇H₅O₂SN b- C₆H₅O₃SN c- C₇H₄O₃SN d- C₇H₅O₃SN

31. The electron transition level of the hydrogen atom in the Paschen-series is:

a- First level b- Second level c- Third level d- Fourth level

32. The De Broglie wavelength of an electron (me = 9.1 x 10⁻⁻⁻⁻²⁸ g) with a speed of (ve

= 1 x 10⁶ m/s) is:

a- 7.3 x 10⁻¹⁰ cm b- 7.3 x 10⁻⁻⁻⁻¹⁰ m c- 7.3 x 10⁻⁷ m d- 7.3 x 10⁻¹³ m

33. The electronic configuration of antimony atom (₅₁Sb) is:

a- [Kr] 5s² 4d³ b- [Kr] 5s² 4d⁹ 5p⁴ c- [Kr] 5s² 4d¹⁰ 5p³ d- [Kr] 5s¹ 5p⁵

34. How many electrons have (llll = 0) antimony atom (₅₁Sb) for ?

a- 10 b- 11 c- 12 d- 13

35. How many unpaired electrons are in antimony atom (51Sb)?

a- 2 b- 3 c- 4 d- 5

37-The result of the mathematical operation [268.8 + (281.9 x 2.593)] to three Significant Figures is:

a- 9.99 x 10² b- 9.99 x 10³ c- 1.000 x 10³ d- 1.00 x 10³ 38-The Ca²⁺ has the same electronic configuration as one of the following elements (Ar, Na,

Ne, F):

a- F b- Ne c- Na d- Ar

39-The ground state of nitrogen atom (7N) is:

40-When (C8H16) is burned in oxygen atmosphere, we obtain (CO2) and (H2O) according to the following equation:

a C₈H₁₆ + b O₂ → c CO₂ + d H₂O In a balanced equation, the factors a, b, c, and d have the values:

a- (a = 1, b = 1, c = 1, d = 1) b-(a = 1, b = 12, c = 8, d = 16) c- (a = 1, b = 12, c = 8, d = 8) d- (a = 1, b = 6, c = 8, d = 16) 41-If the equilibrium constant (K1) for the following reaction equals:

2 SO₂ (g) + O₂ (g) 2 SO₃ (g)

The value of (K₂) for the reaction: 4 SO₃ (g) 4 SO₂ (g) + 2 O₂ (g) equals:

a- K₂ = K₁ b-

1

2 K

K = 1 c- K₂ =K₁² d- ₂

1

2 K

K = 1

42-The hybridization of carbon atom in (C2H4) is:

a- sp² b- sp³ c- sp³ d¹ d- sp³ d²

43-The percentage of carbon atom for a compound is (60.87%), which of the formula is the empirical formula

a- (C₇H₆O₄) b- (C7H6O3) c- (C₇H₆O₂) d- (C₇H₆O) 44-When two s-atomic-orbitals form a linear combination, the molecular orbital

obtained, is::

a- s b-p c- σ d- π

45-In 0.500 mol of Na₂CO_{3 10 H2}O there are:

a- 3.01 x 10²³ Na-atoms b-

6.02 x 10²⁴ H-atoms c- 6.02 x 10²³ H₂O-molecules d- 7.826 x 10²³ O-atoms 46-Two moles of oxygen at STP occupy a volume of:

a- 16 L b-32 L c- 22.4 L d- 44.8 L

47-Increasing the pressure for the reaction causes: N2 (g) + 3 H2 (g) 2 NH3 (g) a- decreases products b- increases products

c- the reaction ceases d- none of the above

48-A sample of a gas occupies (30 mL) at standard temperature and pressure (STP).

What will be the temperature when the volume increases to (60 mL) and the pressure to (2280 mmHg)?

a- 1638ºC b- 1968ºC c- 1638K d- 45.5ºC

49-The equilibrium constant in terms of rate constants for the forward reaction, k_f, and the reverse reaction, k_r, is given as

a-

f r

k

K= k b- K = k_f + k_r c- kr

K= k^f d- K = k_f k_r

50-For the reaction: 2A (g) B (g) at equilibrium, the P_A = 0.60 atm and P_B = 0.60 atm and the total pressure is Ptot = 1.2 atm. What is the PA when the total pressure increased to 1.5 atm?

a- 0.67 atm b-

0.81 atm c- 0.75 atm d- 0.91 atm 51- The IUPAC name for the following compound is:

C₂H₅CH=CHCH₃

a. pentane b. 2-pentene c. 3-pentyne d. 3-pentenol 52- The IUPAC name for the following compound is:

a. 3-heptene b. 3-heptane c. 3-heptyne d. 4-heptyne 53- Which one of the following compounds is an alkane?

a. C₃H₆ b. C₃H₄ c. C₂H₆ d. C₂H₄ e. C₂H₂ 54- What is the generalized formula for an alkene?

a. C_nH_n-2 b. C_2nH_n c. CnH₂n d. C_nH_n+2 e. C_nH_2n+2 55-Classify the following molecule according to its functional group.

a. alcohol b. aldehyde c. carboxylic acid d. ester e. ether 57-Classify the following molecule according to its functional group.

a. Alcohol b. aldehydes c. alkanes d. carboxylic acid e. ester 58- When two amino acids joined together, which form of bond formed?

a. ionic bond b. hydrogen bond c. peptide bond d. metalic bond

59-The total number of amino acids is:

a. 20 b. 19 c40 d. 21 60- The IUPAC name for the following compound is:

a. 3-methyl butane b. 2- methyl butane c. pentane d. 2- methyl butene

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