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