Question

choose all of the compounds below.
□ ozone (o₃)
□ water (h₂o)
□ nitrogen gas (n₂)
□ carbon dioxide (co₂)
□ sodium chloride (nacl)

Explanation:

Step1: Recall the definition of a compound

A compound is a substance composed of two or more different elements chemically bonded together.

Step2: Analyze each substance

• Ozone (\(O_3\)): Consists of only oxygen atoms, so it's an element (allotrope of oxygen), not a compound.
• Water (\(H_2O\)): Composed of hydrogen and oxygen atoms, different elements, so it's a compound.
• Nitrogen gas (\(N_2\)): Consists of only nitrogen atoms, so it's an element, not a compound.
• Carbon dioxide (\(CO_2\)): Composed of carbon and oxygen atoms, different elements, so it's a compound.
• Sodium chloride (\(NaCl\)): Composed of sodium and chlorine atoms, different elements, so it's a compound.

Answer:

The compounds are:

• water (\(H_2O\))
• carbon dioxide (\(CO_2\))
• sodium chloride (\(NaCl\))