Question

which of the following represent compounds?
select all that apply
a co₂
b cl₂
c o₂
d nacl

Explanation:

A compound is a substance formed when two or more different elements are chemically bonded together.

• \(CO_2\) (carbon dioxide) is made of carbon (\(C\)) and oxygen (\(O\)) elements.
• \(NaCl\) (sodium chloride) is made of sodium (\(Na\)) and chlorine (\(Cl\)) elements.
• \(Cl_2\) is a di - atomic molecule of the same element (chlorine), so it is an element (a pure substance of one type of atom), not a compound.
• \(O_2\) is a di - atomic molecule of the same element (oxygen), so it is an element (a pure substance of one type of atom), not a compound.

Answer:

A. \(CO_2\), D. \(NaCl\)