Question

which of the following is not an example of a compound? water limestone hydrogen salt complete this quiz to finish the assignment for chemistry - p8 due on sep 19, 2025 choose all answer and hit next. you will receive your score and answers at the end.

Explanation:

A compound is a substance made up of two or more different elements chemically combined. Water ($H_2O$), limestone (a mixture mainly containing calcium carbonate $CaCO_3$), and salt (sodium - chloride $NaCl$) are compounds. Hydrogen ($H_2$) is an element, not a compound.

Answer:

C. hydrogen