Which of the Following Would Be Regarded as Compounds

Question

Which of the following would be regarded as compounds?
A) H₂O, O₂, and CH₄
B) H₂O and O₂
C) O₂ and CH₄
D) CH₄ and O₂, but not H₂O
E) H₂O and CH₄, but not O₂

Accepted Answer

H₂O (water) and CH₄ (methane) are compounds because they consist of atoms of different elements chemically bonded together. O₂ (oxygen gas), however, is not a compound but a molecule because it consists of two atoms of the same element.