142_R01_Intro_IMF_KEY
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Chemistry
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Feb 20, 2024
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CEM 142 Recitation 1 KEY
IMF Review
1a. Draw 3 molecules of CH
3
CH
2
CH
2
CH
3 (butane) in the liquid state showing the strongest interactions that are present between the molecules. 1b. What type of interaction did you show in your picture? Identify the important features of the interaction and how they were depicted in your picture. Make sure your interaction is labeled.
Revise your picture if necessary. London dispersion forces are temporary interactions between an instantaneous dipole and the subsequently induced dipole. Therefore, the dipoles should be labeled
as such. These temporary dipoles should be indicated on both electron clouds using partial positives and partial negatives. The molecules should be lined up so that the partial positive end of one is interacting with the partial negative end of another molecule. For clarity, the LDF interaction
is labeled, and an arrow is used to specify the place where the interaction occurs.
1c. Are there any other intermolecular forces present in liquid CH
3
CH
2
CH
2
CH
3
? If so, list them below.
none
2a. Draw 3 molecules of (CH
3
)
3
N (trimethylamine) in the liquid state showing the strongest interactions that are present between the molecules.
2b. What type of interaction did you show in your picture? Identify the important features of the interaction and how they were depicted in your picture. Make sure your interaction is labeled.
Revise your picture if necessary.
Dipole-dipole is an interaction between the molecular dipoles of two polar molecules. Therefore, showing the 3D-shape of the molecule and using a molecular dipole arrow is the best way to indicate the overall polarity. The molecules should then be ordered in a way that
clearly indicates that the interaction is taking place between the positive end of one molecule and the negative end of another. For clarity, the dipole-dipole interaction is labeled, and an arrow is used to specify the place where the interaction occurs.
2c. Are there any other intermolecular forces present in liquid (CH
3
)
3
N? If so, list them below.
LDFs
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PRE-LAB QUESTIONS
Name:
1. Circle and label the functional groups for the following compounds.
OH
OH
salicylic acid
LOH
CH3
acetylsalicylic acid
2. Here are the list of melting point for starting materials and products. Explain why the melting
point of salicylic acid is higher than aspirin. Hint: Identify the intermolecular forces for each
compound.
Compound
Salicylic acid
Aspirin
Melting point (°C)
158-161
135
3. Refresh from the recrystallization lab, Buchner funnel was used to collect the product. Draw
the apparatus for suction filtration, including Buchner funnel, filter flask, filter paper, rubber
adapter, rubber tubes.
6
N. Garg, J. Singh, J. Sun, CC BY-NC-SA 4.0
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June 2
QUESTION 4
4.
For ONE of the following molecules, list all the functional
groups.
The hormone, prostaglandin OR the antimalarial quinine
H,C
HO
HO
CH2
HO.
quinine
prostaglandin
15
17°C A C
21
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Sub parts 8, 9
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74.
Which of the following compounds is a teacher likely to use in the classroom?
A.
NaOH
B.
CaCO3
C.
C2H5OH
D.
NaCl
E.
H2SO4
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#75. Please if anyone can, help quick!
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yout References
2 v
Font
₂x²A - A
V
Mailings Review View Help
A A Aa AEE ALT
Y
f3
5
United States) Text Predictions: On
O
14 101
===
Paragraph
Search (Alt+Q)
4.All are correct
V
Accessibility: Good to go
15
5
1.To the polarity of water and that organic compounds are nonpolar.
f6 D
Normal
Organic compounds tend not to mix with water. What is the reason for this chemical
characteristic of organic compounds with water?
2.Because water forms a hydrogen bond and hydrocarbons do not have polarity for this,
unless they have an oxygen in the chain.
3.Some alkanes can mix with water if they have a carbonyl or hydroxyl group.
No Spacing
f7 40
Styles
hp
18
Heading 1
19 0
0
f10
F17
5
F12
Find
Replac
Select-
Editing
82°F Mos
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How many compounds, of the ones listed below, have hydrogen bonding?
CH3(CH2)2NH2 CH3(CH2)4NH(CH2)CH3 (CH3CH2)2N(CH2)4 CH3
Select one:
OA A. 3
OB. 2
OC
C. 0
O D. 1
4
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a
0.57 mg
b
1.20 mg
c
4.52 mg
d
4.65 mg
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Draw 3 molecules of H2 (hydrogen) showing the strongest interaction present between molecules and what type of interaction does it show?
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Tasks:
1. Choose one (1) type of intermolecular force (IMF)
2. Illustrate at least five (5) molecules that exhibit this IMF
3. Relate this type of IMF to situations in everyday life or things found at home
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Answer letter a,b, and c
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[30]
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Please help me answer this question.
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What type(s) of intermolecular forces are expected between CH3CH₂CH₂CH3 molecules?
H
H
H
H
H
H
H
H
H
-H
Indicate with a Y (yes) or an N (no) which apply.
dipole forces
induced dipole (London dispersion) forces
hydrogen bonding
V
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What solvent would you use to differentiate compound A from compound B?
Compound A
Compound B
CH3CCH,CH,CCH3
II
CH3CCH3
soluble
A. water
B. 5% HCI
C. 5% NaOH
D. 5% NaHCОЗ
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2. Draw the chemical structure of a soap and a detergent. Identify the polar and non-polar components of both structures.
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mark on the applicable IMFA present on each substance. (Note: There may be more than
one IMFA present in each substance)
NOTE: To determine the polarity of a molecule, both the bonds present and the overall shape of
the molecule should be considered. Two or more polar bonds may cancel each other out leading
to a nonpolar molecule.
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Activity 1: Classify Me
Directions: Determine what type of intermolecular force/s is/are present in each
compound.
1. Sulfur dioxide (SO2),
2. Nitrogen gas (N2) .
3. Lithium chloride (LiCI) dissolved in water
4. Carbon tetrachloride (CC14)
5. Ethanol (C2H5OH)
6. Hydrogen peroxide (H2O2).
7. Hydrogen iodide (HI)
8. Ammonium bromide (NH4B1) solution
9. Ethylene (C2H4).
10.Phosphorus trichloride (PC13).
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A sample of air is determined to have an SO2 concentration
of 305.7 µg/m³. What is this concentration in ppm?
Assume the air temperature is 300 K.
0.117 ppm
0.0290 ppm
40.2 ppm
0.250 ppm
0.0402 ppm
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Question 1
Place the images in order of weakest attraction to strongest attraction.
3.
-1
+2
-2
+3
-3
100 pm
100 pm
200 pm
O 1<2<3
O 1<3<2
O3 1<2
O 3<2<1
2)
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Sub parts 11 and 12
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Question attached
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