Textbook Question
Which of the following pure compounds can form hydrogen bonds? Which can form hydrogen bonds with water? Which ones do you expect to be soluble in water?
e. CH3(CH2)3CH3
f. CH2=CH—CH2CH3
g. CH3COCH3
h. CH3CH2COOH
2604
views
2. Molecular Representations
Intermolecular Forces
6:17 minutesProblem 5c,d
Textbook Question
Draw the hydrogen bonding that takes place between
c. a molecule of dimethyl ether and two molecules of water.
d. two molecules of trimethylamine and a molecule of water.
Verified step by step guidance1
Step 1: Understand the concept of hydrogen bonding. Hydrogen bonds are a type of dipole-dipole interaction that occurs between a hydrogen atom bonded to a highly electronegative atom (such as oxygen, nitrogen, or fluorine) and another electronegative atom with a lone pair of electrons.
Step 2: For part c, identify the functional groups involved. Dimethyl ether has an oxygen atom with lone pairs, and water molecules have oxygen atoms with lone pairs and hydrogen atoms that can participate in hydrogen bonding.
Step 3: Draw the structure of dimethyl ether, which is \( \text{CH}_3\text{OCH}_3 \), and two water molecules \( \text{H}_2\text{O} \). Show the lone pairs on the oxygen atoms in both dimethyl ether and water molecules.
Step 4: Illustrate the hydrogen bonds. The oxygen atom in dimethyl ether can form hydrogen bonds with the hydrogen atoms of the water molecules. Draw dashed lines to represent these hydrogen bonds between the oxygen of dimethyl ether and the hydrogen atoms of water.
Step 5: For part d, identify the functional groups involved. Trimethylamine has a nitrogen atom with a lone pair, and water has oxygen atoms with lone pairs and hydrogen atoms. Draw the structure of trimethylamine \( \text{(CH}_3\text{)}_3\text{N} \) and a water molecule \( \text{H}_2\text{O} \). Show the hydrogen bonds between the nitrogen atom of trimethylamine and the hydrogen atoms of the water molecule.
Verified video answer for a similar problem:This video solution was recommended by our tutors as helpful for the problem above
Video duration:
6mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Hydrogen Bonding
Hydrogen bonding is a type of dipole-dipole interaction that occurs when a hydrogen atom, covalently bonded to a highly electronegative atom like oxygen or nitrogen, interacts with another electronegative atom. This bond is weaker than covalent bonds but stronger than van der Waals forces, playing a crucial role in determining the structure and properties of compounds.
Recommended video:
Guided course
00:48
The definition of hydrogenation.
Electronegativity
Electronegativity refers to the ability of an atom to attract shared electrons in a chemical bond. In the context of hydrogen bonding, atoms like oxygen and nitrogen have high electronegativity, which allows them to attract hydrogen atoms from nearby molecules, facilitating the formation of hydrogen bonds. Understanding electronegativity is essential for predicting molecular interactions.
Recommended video:
Guided course
1:47Electronegativity
Molecular Structure and Polarity
The molecular structure and polarity of a compound determine its ability to form hydrogen bonds. Dimethyl ether has a polar C-O bond, allowing it to interact with water molecules, while trimethylamine has a lone pair on nitrogen, enabling hydrogen bonding with water. Recognizing these structural features helps in visualizing and drawing hydrogen bonding interactions.
Recommended video:
Guided course
2:04Molecular Polarity
Related Videos
Related Practice