Which of the following statements is (or are) true?
I Hydrogen bonds occur between two hydrogen atoms.
II Hydrogen bonding occurs between a hydrogen atom and an oxygen atom within a molecule.
III Hydrogen bonding requires a molecule containing a large atom.
IV Hydrogen bonding must be overcome for water to boil.
A. IV only
B. II and IV only
C. I and III only
D. II and III only
I think that it is II and IV only. What do you think?
So is it just IV?
II is not right.The H of one molecule partially bonds with the oxygen of an adjacent molecule. Go on google and look at pictures of the H bond.
IV is the only correct one. A hydrogen bond is the attractive force between a hydrogen atom bonded to an electronegative atom and the lone pair of electrons on another highly electronegative atom. A common misconception is that hydrogen bonding is within a molecule or between two hydrogen atoms. Water has hydrogen bonding, which gives it a higher boiling point than the other Group 6 hydrides.
I agree with you that statements II and IV are true.
To explain why, let's go through each statement and analyze them:
Statement I: "Hydrogen bonds occur between two hydrogen atoms."
This statement is false. Hydrogen bonds occur between a hydrogen atom and an electronegative atom such as oxygen, nitrogen, or fluorine. Two hydrogen atoms cannot form a hydrogen bond.
Statement II: "Hydrogen bonding occurs between a hydrogen atom and an oxygen atom within a molecule."
This statement is true. Hydrogen bonding typically occurs when a hydrogen atom is covalently bonded to an electronegative atom, such as oxygen, within a molecule. The hydrogen atom forms a weak bond with another electronegative atom in a neighboring molecule, resulting in a hydrogen bond.
Statement III: "Hydrogen bonding requires a molecule containing a large atom."
This statement is false. Hydrogen bonding does not require a molecule with a large atom. It depends on the presence of an electronegative atom that can form a hydrogen bond with a hydrogen atom.
Statement IV: "Hydrogen bonding must be overcome for water to boil."
This statement is true. Hydrogen bonding between water molecules creates strong intermolecular forces. To change the liquid water into gaseous water vapor (boiling), these hydrogen bonds must be broken by supplying enough energy.
Based on our analysis, statement II and IV are true, so the correct answer is B. "II and IV only."