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Intermolecular Forces
Intermolecular Forces
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Intermolecular forces, preliminary chemistry #intermolecularforces
Flashcards
43 cards
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Questions
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Answers
1
Which of the following molecules is (are) polar?
CH4,CH2O, CH3Cl
CH4, CH3Cl
CH2O, CH3Cl
2
Which is more polar?
CH3Cl
CH4
CH2OH
Cl2
3
What information do you need to draw a Lewis dot diagram?
Period of Element
Charge of element
Number of valence electrons
Kind of element
4
Which of the following elements cannot take part in hydrogen bonding?
nitrogen
bromine
fluorine
oxygen
5
Which intermolecular force is experienced by ALL molecules
Hydrogen
Dipole-dipole
Ionic
Dispersion
6
Greater intermolecular forces between molecules result in _________ and _____________ .
Higher melting points
Lower melting points
Lower boiling points
Higher boiling points
7
In water the molecular dipole would point out towards?
The O
The H's
8
Electrons that shared equally between 2 atoms form a _______?
nonpolar covalent bond
polar covalent bond
9
What is the BEST arrangement of a given number of electron domains?
Arrangement that reduces amount of nonbonding electron pairs
Arrangement that decreases the bond angles
Arrangement that increases the repulsions among the domains
Arrangement that minimizes the repulsions among the domains
10
One of the atoms exerts a greater attraction for the bonding electrons than the other
Polar Covalent
Nonpolar Covalent
11
Which of the following has the strongest dispersion forces between molecules?
S8
I2
CO2
C6H14
12
London Dispersion forces arise when...
two polar molecules are attracted to one another
ions and polar molecules are attracted to one another
there is an uneven distribution of electrons
molecules form that have H, N, O, and/or F in their formulas
13
What is the electron domain geometry of PCl
5
?
Trigonal bipyrimidal
Seesaw
Octahedral
Tetrahedral
14
What are the predicted bond angles when the electron-domain geometry is
trigonal planar
?
< 109.5°
120°
120° and 90°
109.5°
15
SO
2
's molecular geometry is __________ and its polarity is ________?
Bent and Nonpolar
Linear and nonpolar
Bent and polar
Linear and polar
16
Which molecule has the highest melting point?
Ammonia (NH3)
Hydrogen sulfide (H2S)
Water (H2O)
17
Which molecule has the highest boiling point?
Water (H2O)
Hydrogen sulfide (H2S)
Ammonia (NH3)
18
How does molecular geometry differ from electron-domain geometry?
Includes only the atoms in a molecule or ion
Does not include the non-bonding electron pairs
None of the above
Molecular geometry and electron-domain geometry are the same
19
What IMF are may be seen between polar molecules?
London dispersion
dipole-dipole
hydrogen bonds
All of them
20
Which molecule is non-polar?
H2O
NH3
CO2
HF
21
What is the geometry of NH
3
?
Trigonal Pyramidal
Tetrahedral
Bent
Trigonal Planar
22
Intermolecular forces...
prevent electrons from falling into the nucleus
are repelling forces that keep particles apart
aren't important when determining the phase state
are attractive forces that hold particles together
23
The bond in H
2
is ___________?
polar
nonpolar
ionic
24
How many valence electrons does Nitrogen have?
3
2
5
4
25
Which molecule is polar?
CO2
HF
F2
H2
26
How many bonds can nitrogen make?
2
4
5
3
27
An H bond exists between the Attraction of a _______ and a _______ on a nearby compond
H and N, O or F
C and a N, O, or F
F and a H, C or N
N and a H,C or F
28
What is the geometry of SiH
4
?
Trigonal Planar
Trigonal Pyramidal
Bent
Tetrahedral
29
In CH
2
OH the molecular dipole would be pointed through the?
The Oxygen
The Carbon
The Hydrogen
30
One of these molecules is not like the others! Which one is it?
CH4
NH3
Br2
BH3
31
What is the shape of a molecule determined by?
Lewis structure
Electron Repulsion
Polarity
Nonbonding pairs
32
Select ALL intermolecular forces
Covalent bonds
Dispersion
Hydrogen bonding
Dipole-dipole
33
HCl is ________?
Nonpolar
Polar
34
INTERmolecular forces are __________ than INTRAmolecular forces.
Stronger
Weaker
35
BF
3
's molecular geometry is __________ and its polarity is ________?
Trigonal Planar and polar
Trigonal Planar and nonpolar
Tetrahedral and polar
Tetrahedral and nonpolar
36
Which intermolecular force is STRONGEST
Dipole-dipole
Hydrogen bonds
Dispersion forces
37
What is the definition of polar?
When a molecule can be dissolved in water
When a covelent molecule doesn't share electrons evenly
When a covelent molecule does share electrons evenly
When a molecule cannot be dissolved in water
38
H-bonding can only occur when hydrogen bonds with ____ , ____ or ____ in another molecule?
Carbon, Nitrogen, Fluorine
Bromide, Fluorine, Oxygen
Nitrogen, Oxygen, Fluorine
Hydrogen, Oxygen, Nitrogen
39
Is ammonia (NH
3
) polar?
No
Yes
40
Rank these forces from strongest to weakest
dipole-dipole, hydrogen bonds, London dispersion
London dispersion, dipole-dipole, hydrogen bonds
dipole-dipole, London dispersion, hydrogen bonds
hydrogen bonds, dipole-dipole, London dispersion
41
In non-polar molecules, what is the ONLY type of physical (intermolecular) bond?
Dispersion forces
Dipole-dipole
Hydrogen bonding
42
Is CH
4
polar?
No
Yes
43
Which intermolecular force is the WEAKEST?
Dipole-dipole
Dispersion forces
Hydrogen bonds
