Chem. 125 (Spring 2005)
Exam 1 (100 pts) February 3, 2005
Name: ------, CLID # ------
LAST NAME, First
(Circle the alphabet segment of your LAST NAME): A-B C-F G-L M-O P-Z
Please answer the following questions:
Part I:Multiple Choices: (3 pts. each, 66pts. total)Circle only ONE best answer.
1. The electronic configuration of potassium 19K is:
a) 1s2 2s2 2p6 3s4 3p5 b) 1s2 2s2 2p6 3s2 3p7
c) 1s2 2s2 2p6 3s2 3p6 4s1 d) 1s2 2s2 2p5 3s2 3p6 4s2
2. The number of neutrons in is:
a) 17 neutrons b) 35 neutrons
c) 18 neutrons d) 20 neutrons
3. Considering the # of significant figures when carrying out the conversion of
16.4 in. to centimeter, the answer equals
a) 6.46 in2/cm.b) 6.46 cm.
c) 41.7 cm.d) 4.170 x 102 cm.
4.…………. is not a type of matter.
a) Airb) idea
c) Water d) Iron
5.Which of the following elements has the largest atomic radius?
a) Fb) Li
c) Bed) N
6. 104°Fequals to ……………..
a) 40°C. b) 20°C.
c) 377°C. d) None of the above.
7. How many significant figures in 0.00328?
a) 6 significant figures. b) 3 significant figures.
c) 5 significant figures. d) None of the above.
8. Which of the following electronic configuration is not reasonable?
a) 1s2 2s2 2p6 3s2 3p5b) 1s2 2s2 2p6 3s2
c) 1s2 2s2 2p2 3s2d) 1s2 2s2 2p1
9. The type of bond between H and Cl (H−Cl) in HCl is a (an) …………
a) polar covalent bond.b) ionic bond.
c) non-polar covalent bond.d) hydrogen bond.
10. Which of the following pairs of symbols represent isotopes?
a) and b) and
c) and d) none of the above
11. The Lewis dot structure of the neutral atom of magnesium 12Mg is ……….
a)b)
c) d)
12. The name of the N2O4 is ……….
a) Nitrogen oxide.b) Dinitrogen tetroxide.
c) tetranitrogen dioxide.d) dinitrogen dioxide.
13. The s and psub-orbitals are filled by maximum ………… electrons, respectively.
a) 2 and 10b) 6 and 10
c) 6 and 10d) 2 and 6
14. The smallest unit of an element is a(n):
a) homogeneous compoundb) molecule
c) heterogeneous compoundd) atom
15. What are the correct formulas of nitrate, phosphate, and cyanide polyatomic ions?
a) NO2¯2, PO4¯, CN¯ b) NO¯, PO¯,CN¯
c) NO2+, PO4¯2, CN¯ d) NO3¯, PO4¯3, CN¯
16. Which of the following statements concerning a covalent bond is true?
a) A covalent bond occurs between two metals.
b) A covalent bond is formed by sharing electrons between the two bonded atoms.
c) A covalent bond is formed from the attraction of ions of the opposite charges.
d) All of the above.
17. A negative heat of reaction (ΔH) is an indication of a (an) …………
a) exothermic reaction.b) endothermic reaction.
c) reversible reaction.d) irreversible reaction.
18. Which of the following elements has highest metallic character?
a) Clb) P
c) Nad) Al
19. What is true about the ionic compounds?
a)They are formed by attraction of positive ions of metals and negative ions of
non-metals.
b)Most of them are solids.
c)Most of them are soluble in water.
d)All of the above.
20. What is true about mercury (Hg)?
a) It is a non-metal.b) It is an inert gas.
c) It is the only liquid metal.d) All of the above.
21. What is not true about metals?
a)They are all solids except Hg the only liquid metal.
b)They form negatively charged ions by gaining electrons.
c)They are all good conductors of heat and electricity.
d)All of the above.
22. Oil in water is a (an) ……………
a) heterogeneous mixture.b) element.
c) homogeneous mixture. d) compound.
Part II:Short Answer(34pts. total) Answer the following questions. Partial credit
will be given to those answers in right direction to reach the correct answer:
- (5pts.)Write the Lewis dot structure for NF3? What is the number of bonding and
non-bonding electrons for this Lewis structure?
2. (8pts.)Balance the following equations:
a) ----- TiCl4 + ----- H2O ------TiO2 + ----- HCl
b) ----- LiH + ------AlCl3------LiAlH4 + ------LiCl
3. (8 pts.)Give one elemental symbol and name for each of the following:
a) Alkaline earth metal______
b) Noble gas______
c) Halogen______
d) Metalloide ______
4. (3 pts.) What is the volume of a 475 g piece of copper, knowing that the density
of copper is 8.94 g/cm3? (Consider the # of significant figures).
5. (10 pts.) Answer the following questions about calcium chloride molecule?
a) Draw the Lewis dot structures of Ca and Cl atoms?
b) Write the chemical formula of calcium chloride molecule.
c) What type of bonding is involved in this molecule? Mention one fact about this
type of bond.
d) What is the molar mass of calcium chloride?
Extra Credit:(2 pts. each)How many atoms of each element in the following chemical formulas?
a) (NH4)2HPO4b) Ca3(PO4)2
Exam 1 – Spring 2005
You will have 50 minutes to complete this exam. The exam has 4 pages plus the Periodic Table (Reference page).
When you are told to do so, tear off the Periodic Table cover sheet and use as required during the exam.
1A 2A 3A 4A 5A 6A 7A 8A
1 2 13 14 15 16 17 18
1 / 1H
1.01 / Periodic Table of the Elements / 2
He
4.00
2 / 3
Li
6.94 / 4
Be
9.01 / 5
B
10.81 / 6
C
12.01 / 7
N
14.01 / 8
O
16.00 / 9
F
19.00 / 10
Ne
20.18
3 / 11
Na
22.99 / 12
Mg
24.30 / 3B
3 / 4B
4 / 5B
5 / 6B
6 / 7B
7 / 8B
8 / 8B
9 / 8B
10 / 1B
11 / 2B
13 / 13
Al
26.98 / 14
Si
28.08 / 15
P
30.97 / 16
S
32.06 / 17
Cl
35.45 / 18
Ar
39.95
4 / 19
K
39.1 / 20
Ca
40.08 / 21
Sc
44.96 / 22
Ti
47.88 / 23
V
50.94 / 24
Cr
52.00 / 25
Mn
54.94 / 26
Fe
55.85 / 27
Co
58.93 / 28
Ni
58.69 / 29
Cu
63.55 / 30
Zn
65.38 / 31
Ga
69.72 / 32
Ge
72.59 / 33
As
74.92 / 34
Se
78.96 / 35
Br
79.90 / 36
Kr
83.80
5 / 37
Rb
85.47 / 38
Sr
87.62 / 39
Y
88.91 / 40
Zr
91.22 / 41
Nb
92.91 / 42
Mo
95.94 / 43
Tc
(98) / 44
Ru
101.1 / 45
Rh
102.9 / 46
Pd
106.4 / 47
Ag
107.9 / 48
Cd
112.4 / 49
In
114.8 / 50
Sn
118.7 / 51
Sb
121.8 / 52
Te
127.6 / 53
I
126.9 / 54
Xe
131.1
6 / 55
Cs
132.9 / 56
Ba
137.3 / 57
La
138.9 / 72
Hf
178.5 / 73
Ta
181.0 / 74
W
183.8 / 75
Re
186.2 / 76
Os
190.2 / 77
Ir
192.2 / 78
Pt
195.1 / 79
Au
197.0 / 80
Hg
200.6 / 81
Tl
204.4 / 82
Pb
207.2 / 83
Bi
209.0 / 84
Po
(209) / 85
At
(210) / 86
Rn
(222)
7 / 87
Fr
(223) / 88
Ra
226.0 / 89
Ac
227.0 / 104
Rf
(261) / 105
Db
(262) / 106
Sg
(263) / 107
Bh
(262) / 108
Hs
(265) / 109
Mt
(266) / 110
Uun
(269) / 111
Uuu
(272) / 112
Uub
(277)
58
Ce
140.1 / 59
Pr
140.9 / 60
Nd
144.2 / 61
Pm
(145) / 62
Sm
150.4 / 63
Eu
152.0 / 64
Gd
157.2 / 65
Tb
158.9 / 66
Dy
162.5 / 67
Ho
164.9 / 68
Er
167.3 / 69
Tm
168.9 / 70
Yb
173.0 / 71
Lu
175.0
90
Th
232.0 / 91
Pa
231.0 / 92
U
238.0 / 93
Np
237.0 / 94
Pu
(244) / 95
Am
(243) / 96
Cm
(247) / 97
Bk
(247) / 98
Cf
(251) / 99
Es
(252) / 100
Fm
(257) / 101
Md
(258) / 102
No
(259) / 103
Lr
(260)
1