which of the following is a compound? a nitrogen (n₂) b hydrogen (h₂) c helium (he) d hydrochloric acid (hcl)
which of the following is a compound? a nitrogen (n₂) b hydrogen (h₂) c helium (he) d hydrochloric acid (hcl)
Answer
Brief Explanations:
A compound is a substance made up of two or more different elements chemically combined. Nitrogen ($N_2$) and hydrogen ($H_2$) are elements in their molecular form with only one - type of atom. Helium (He) is a single - atom element. Hydrochloric acid (HCl) is composed of hydrogen and chlorine atoms chemically bonded, so it is a compound.
Answer:
D. Hydrochloric acid (HCl)