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CH221 Review
CH221 Review
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1
Which equation represents the sublimation of iodine crystals?
I2 (s) --> I2 (g)
I2 (s) --> I2 (l)
I2 (g) --> I2 (s)
I2 (l) --> I2 (s)
2
Which of the following atoms would have the largest first ionization energy?
Rb
K
Na
Cs
3
Which of the following pairs represent isotopes?
31H and 42He
Co and CO
32He and 42He
Cu+ and Cu2+
4
Which of these measurements have three significant figures?
I, II, and III
II and III
I and II
I, II, III, and IV
5
For which molecule is the molecular geometry (shape) different from its electronic geometry?
PCl5
CH4
NH3
BF3
6
Select the correct statement
CuO is copper oxide.
K2O is dipotassium oxide.
All are incorrect.
MgCl2 is magnesium(II) chloride.
7
Which of these has the highest number of electrons?
A
D
B
C
8
Which of these is an incorrect orbital notation?
2d
2p
5d
5s
9
Which of these has the highest number of protons?
B
A
C
D
10
What is the percent by mass of C in CO
2
?
43 %
33 %
27 %
50 %
11
The reason that CH
3
CH
2
OH (ethanol) has a higher boiling point than CH
3
OCH
3
(dimethyl ether) is
dimethyl ether only experiences dispersion forces.
ethanol has larger dispersion forces than dimethyl ether.
ethanol is polar, and dimethyl ether is not.
ethanol can form hydrogen bonds, and dimethyl ether cannot.
12
How many neutrons in an atom of
45
Sc
3+
?
27
18
21
24
13
Which of the following equations is not balanced?
2 H2 + O2 → 2 H2O
3 AgI + Fe2(CO3)3 → 3 Ag2CO3 + FeI3
2 AlBr3 + 3 K2SO4 → 6 KBr + Al2(SO4)3
CH4 + 2 O2 → CO2 + 2 H2O
14
What is the correct formula for dinitrogen monoxide?
NO
N2O2
NO2
N2O
15
How many moles of C are in 5 moles of ethylene, C
2
H
4
?
5
2
3.01 x 1024
10
16
Which electronic transition in the hydrogen atom results in the emission of light of the longest wavelength?
n = 4 to n = 3
n = 3 to n = 1
n = 1 to n = 2
n = 1 to n = 6
17
Cathode rays are made up of electrons.
True
False
18
Which relationship is correct?
103 mm = 1 m
1 km = 100 m
1 nm = 109 m
1 mm = 10 cm
19
How many double bonds are there in the hydrazine (N
2
H
4
) molecule?
0
2
1
4
20
Which of the following atoms would have the largest atomic radius?
F
O
N
B
21
Which set of quantum numbers is allowed?
n = 4, 𝓁 = 2, m𝓁 = –3, ms = –½
n = 2, 𝓁 = 2, m𝓁 = 0, ms = ½
n = 5, 𝓁 = 1, m𝓁 = –1, ms = ½
n = 2, 𝓁 = 1, m𝓁 = 0, ms = 1
22
Which molecule do you expect to have the smallest attractions from dispersion forces?
CH3CH3
CCl4
CH4
CH2Br2
23
What element is
77
35
X
3-
?
As
Ta
Ir
Br
24
Cathode rays travel in straight lines in the absence of an electric field but are deflected by electric fields.
False
True
25
Which of the following atoms would have the largest first ionization energy?
Si
Al
Mg
Na
26
Which compound is represented by the correct formula? Assume the names are correct.
Iron(III) nitrate ; Fe(NO3)3
Lithium nitride ; LiN
Potassium sulfate ; KSO4
Calcium hydroxide ; CaOH
27
The melting point of benzoic acid is 122
o
C. Which students data are precise but not accurate?
Student A
Student B
Student D
Student C
28
Which answer is reported to the correctly for the calculation 10.3 m x 3 m?
30 m2
30.9 m2
30.90 m
31 m
29
Which of the following pairs of molecules have the same empirical formula?
H2O and H2O2
CH4 and C2H2
C2H2 and C6H6
C6H12O6 and C12H22O11
30
Which of the following liquids would be the best choice for dissolving solid potassium chloride (KCl)?
C6H6, benzene
CCl4, carbon tetrachloride
CH3CH2CH2CH3, butane
CH3CH2OH, ethanol
31
Which compound is named correctly? Assume the formulas are correct.
CaBr2 ; calcium dibromide
Na3P ; sodium phosphate
Cu2O ; copper(II) oxide
Fe2(SO4)3 ; iron(III) sulfate
32
Which of these atomic and/or molecular views represent pure substances?
II, III, and IV
I and III
I, II, and IV
II and IV
33
What is the relationship between frequency and wavelength?
They are unrelated
They are directly proportional
They are the same
They are inversely proportional
34
The properties of cathode rays are dependent on the cathode material.
False
True
35
Predict the molecular shape (geometry) and bond angle of the sulfur dichloride, SCl
2
, molecule.
Bent, <109o
Trigonal pyramidal, <109o
Linear, 180o
Trigonal planar, 120o
36
The most precise tool to dispense 10.0 mL is _____.
They all work equally well.
25 mL graduated cylinder
100 mL beaker
50 mL Erlenmeyer flask
37
What is the wavelength of microwaves with a frequency of 2 × 10
10
s
−1
?
663 nm
1.5 cm
0.67 m
0.015 mm
38
Which of these are chemical properties of matter?
II and IV
III and IV
I and II
I and III
39
Consider this reaction: N
2
+ 3 H
2
→ 2 NH
3
How many moles of NH
3
will be produced if 2.0 mol N
2
reacts with 4.0 mol H
2
?
1.0 mol NH3
2.0 mol NH3
4.0 mol NH3
2.7 mol NH3
40
Which of these regions of the electromagnetic spectrum has the shortest wavelength?
Gamma rays
Visible
Infrared
Ultraviolet
41
What is the correct electron configuration for Sn?
[Kr]5p2
[Kr]5s24d 105p2
[Kr]5s25d 105p2
[Kr]5s25p2
42
Which of these is an exception to the octet rule?
H3O+
NF3
IF4+
PCl3
43
How many 4f orbtials are there?
1
7
4
2
44
What is the correct isotopic symbol for a neutral element with 18 protons and 22 neutrons?
91Zr
40Ar
22Ar
40Ti
45
Which pure substances will form hydrogen bonds between molecules?
I & III
I & II
II & III
II & IV
