Question

question 12
which is a molecule that contains two nitrogens and is highly soluble in water?

○ urea

○ chyme

○ protein

○ amino acid

Explanation:

• Urea has the formula $\ce{CO(NH_{2})_{2}}$, containing two nitrogen atoms, and is highly soluble in water due to hydrogen bonding with water molecules.
• Chyme is a mixture of food and gastric juices, not a single molecule with two nitrogens.
• Proteins are polymers of amino acids; while they contain nitrogen, a single protein molecule's nitrogen count varies and they aren’t defined by having two nitrogens, and solubility varies (many aren’t highly soluble).
• Amino acids typically have one nitrogen (except some like lysine derivatives, but generally one per amino acid), so they don’t fit the “two nitrogens” criterion.

Answer:

A. urea