Which type of bond is easily broken by water and heat?

• A. Ionic Bond
• B. Hydrogen Bond
• C. Covalent Bond
• D. Peptide Bond

Answer: (B)

Hydrogen bonds are weak, noncovalent attractions that form between a hydrogen atom bonded to a highly electronegative atom (like oxygen or nitrogen) and another electronegative atom nearby. Because they’re comparatively delicate, they’re easily disrupted by changes in the environment. Water, with its abundance of hydrogen-bonding sites, competes for those interactions and can break existing hydrogen bonds while forming new ones with the solute. Heat adds kinetic energy to molecules, making it easier for these bonds to break and for molecules to separate. That combination—that water’s solvent interactions and added thermal energy—makes hydrogen bonds the type most readily broken by water and heat. In contrast, ionic and covalent bonds are much stronger and require much more energy to disrupt, and peptide bonds are covalent bonds within proteins, not easily broken by typical water exposure or moderate heating.