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CH221 Review 22 Flashcards | StudBud
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CH221 Review 22
CH221 Review 22
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1
Which of these regions of the electromagnetic spectrum has the shortest wavelength?
Ultraviolet
Gamma rays
Visible
Infrared
2
Consider this reaction: N
2
+ 3 H
2
ā 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
4.0 mol NH3
2.0 mol NH3
1.0 mol NH3
3
What is the percent by mass of C in CO
2
?
50 %
43 %
33 %
27 %
4
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
5
Which of the following pairs of molecules have the same empirical formula?
C2H2 and C6H6
C6H12O6 and C12H22O11
H2O and H2O2
CH4 and C2H2
6
Which pure substances will form hydrogen bonds between molecules?
I & II
II & III
I & III
II & IV
7
Cathode rays travel in straight lines in the absence of an electric field but are deflected by electric fields.
False
True
8
Which of these are chemical properties of matter?
I and III
II and IV
III and IV
I and II
9
Select the correct statement
K2O is dipotassium oxide.
CuO is copper oxide.
All are incorrect.
MgCl2 is magnesium(II) chloride.
10
Which of the following atoms would have the largest atomic radius?
N
O
B
F
11
Which of the following pairs represent isotopes?
31H and 42He
32He and 42He
Cu+ and Cu2+
Co and CO
12
The reason that CH
3
CH
2
OH (ethanol) has a higher boiling point than CH
3
OCH
3
(dimethyl ether) is
ethanol is polar, and dimethyl ether is not.
ethanol has larger dispersion forces than dimethyl ether.
dimethyl ether only experiences dispersion forces.
ethanol can form hydrogen bonds, and dimethyl ether cannot.
13
Which set of quantum numbers is allowed?
n = 2, š = 2, mš = 0, ms = Ā½
n = 4, š = 2, mš = ā3, ms = āĀ½
n = 5, š = 1, mš = ā1, ms = Ā½
n = 2, š = 1, mš = 0, ms = 1
14
How many neutrons in an atom of
45
Sc
3+
?
27
21
18
24
15
Which answer is reported to the correctly for the calculation 10.3 m x 3 m?
30.90 m
31 m
30 m2
30.9 m2
16
What is the correct formula for dinitrogen monoxide?
NO2
N2O
N2O2
NO
17
Which compound is represented by the correct formula? Assume the names are correct.
Calcium hydroxide ; CaOH
Lithium nitride ; LiN
Iron(III) nitrate ; Fe(NO3)3
Potassium sulfate ; KSO4
18
How many 4f orbtials are there?
1
2
7
4
19
The properties of cathode rays are dependent on the cathode material.
True
False
20
Which of these has the highest number of protons?
C
B
D
A
21
If 3 mol FeCl
3
are ignited with 2 mol O
2
how much reagent is present in excess? 4FeCl
3
+ 3 O
2
=> 2 Fe
2
O
3
+ 6 Cl
2
0.67 mol FeCl3 unreacted
0.25 mol O2 unreacted
0.33 mol FeCl3 unreacted
0.50 mol O2 unreacted
22
Which of these atomic and/or molecular views represent pure substances?
II and IV
I, II, and IV
II, III, and IV
I and III
23
Which of these is an incorrect orbital notation?
2d
2p
5s
5d
24
Which relationship is correct?
103 mm = 1 m
1 nm = 109 m
1 km = 100 m
1 mm = 10 cm
25
Predict the molecular shape (geometry) and bond angle of the sulfur dichloride, SCl
2
, molecule.
Bent, <109o
Linear, 180o
Trigonal pyramidal, <109o
Trigonal planar, 120o
26
Which molecule do you expect to have the smallest attractions from dispersion forces?
CCl4
CH2Br2
CH3CH3
CH4
27
For which molecule is the molecular geometry (shape) different from its electronic geometry?
BF3
NH3
CH4
PCl5
28
Cathode rays are made up of electrons.
True
False
29
Which of the following equations is not balanced?
2 H2 + O2 ā 2 H2O
CH4 + 2 O2 ā CO2 + 2 H2O
2 AlBr3 + 3 K2SO4 ā 6 KBr + Al2(SO4)3
3 AgI + Fe2(CO3)3 ā 3 Ag2CO3 + FeI3
30
How many moles of C are in 5 moles of ethylene, C
2
H
4
?
2
10
5
3.01 x 1024
31
Which of the following liquids would be the best choice for dissolving solid potassium chloride (KCl)?
CCl4, carbon tetrachloride
C6H6, benzene
CH3CH2CH2CH3, butane
CH3CH2OH, ethanol
32
Which of these is an exception to the octet rule?
H3O+
PCl3
NF3
IF4+
33
Which compound is named correctly? Assume the formulas are correct.
CaBr2 ; calcium dibromide
Fe2(SO4)3 ; iron(III) sulfate
Na3P ; sodium phosphate
Cu2O ; copper(II) oxide
34
Which equation represents the sublimation of iodine crystals?
I2 (l) --> I2 (s)
I2 (g) --> I2 (s)
I2 (s) --> I2 (l)
I2 (s) --> I2 (g)
35
Which of these measurements have three significant figures?
I and II
I, II, III, and IV
I, II, and III
II and III
36
What is the correct electron configuration for Sn?
[Kr]5s25dā 105p2
[Kr]5s25p2
[Kr]5s24dā 105p2
[Kr]5p2
37
Resonance structures describe molecules that have
resonating electrons
multiple electron dot structures
hybrid orbitals
rapid equilibria
38
What is the relationship between frequency and wavelength?
They are inversely proportional
They are the same
They are directly proportional
They are unrelated
39
What is the correct isotopic symbol for a neutral element with 18 protons and 22 neutrons?
40Ar
40Ti
91Zr
22Ar
40
Which of the following atoms would have the largest first ionization energy?
Mg
Al
Na
Si
41
The melting point of benzoic acid is 122
o
C. Which students data are precise but not accurate?
Student B
Student C
Student A
Student D
42
How many double bonds are there in the hydrazine (N
2
H
4
) molecule?
2
4
1
0
