solve for 20 points
Answers
Answer:
1. Hydrogen bond is a covalent bond with two hydrogen and one oxygen atom. The van der walls force in hydrogen is strong.
2. Formic acid exists as dimer due to intermolecular hydrogen bonding. As a result of dimerisation, the boiling of formic acid is higher than the corresponding alkanes and alcohols.
3. When water freezes, water molecules form a crystalline structure maintained by hydrogen bonding. Solid water, or ice, is less dense than liquid water. Ice is less dense than water because the orientation of hydrogen bonds causes molecules to push farther apart, which lowers the density.
4. during ice phase of water , hydrogen bonds forms cage like structure . hence it occupies large volume, as temperature increases to 277K hydrogen bonds r broken hence volume decreases and density increases.. ... therefore water has it's maximum density at 277 K
5. In a molecule, hydrogen bonds are formed, when the hydrogen atom covalently linked to a highly electronegative atom like oxygen, nitrogen, or fluorine, experiences the electrostatic field of another highly electronegative atom of the nearby molecule.
6. Two Requirements for Hydrogen Bonding:
a. First molecules has hydrogen attached to a highly electronegative atom (N,O,F). (hydrogen bond donor)
b. Second molecule has a lone pair of electrons on a small highly electronegative atom (N,O,F). (hydrogen bond acceptor)
7. [tex]\bullet Intermolecular\ hydrogen\ bonding\ – \Intermolecular\\ hydrogen\ bonding\ is\ formed\ between\ two\ or\ more\ different\\ molecules\ of\ the\ same\ or\ different\ types.\\ \bullet An\ intramolecular\ hydrogen\ bond\ results\ in\ the\ cyclization\ of\ the\ molecule\ and\\ prevents\ their\ association.
Explanation:
Answer:
I think the above answers are correct