Beginner Quiz on Identifying Element, Molecule, or a Compound

Here is a 5-question beginner quiz on identifying an Element, Molecule, or a Compound

A Quick Recall- 

• Element: Pure substance with only one type of atom (all of the same element).
• Molecule: Two or more atoms covalently bonded (can be homoatomic/elemental or heteroatomic).
• Compound: Two or more different elements chemically bonded (can be molecular/covalent or ionic; ionic ones form lattices, not discrete molecules).

Instructions: For each substance, classify it as:

• Element only
• Molecule only (homoatomic/elemental)
• Molecule and compound (molecular/covalent compound)
• Compound only (typically ionic, no discrete molecules)

Some can fit more than one category depending on context (e.g., O₂ is both an element and a molecule). 

Would you like to read the comparison on — Atom, Element, Molecule, and Compound — before you begin the quiz?