the formulas for three different materials are shown below.\nco₂\nnacl\nhcl\nthese may all be classified…

the formulas for three different materials are shown below.\nco₂\nnacl\nhcl\nthese may all be classified as\na elements and compounds.\nb elements and molecules.\nc elements and pure substances.\nd compounds and pure substances.

the formulas for three different materials are shown below.\nco₂\nnacl\nhcl\nthese may all be classified as\na elements and compounds.\nb elements and molecules.\nc elements and pure substances.\nd compounds and pure substances.

Answer

Brief Explanations:

A compound is a substance formed when two or more chemical elements are chemically bonded together. Pure substances are substances that have a fixed chemical composition. $CO_2$, $NaCl$, and $HCl$ are all compounds made of different elements chemically combined, and they are also pure substances. They are not elements (which are made of only one - type of atom).

Answer:

D. compounds and pure substances