Carbon (C) and hydrogen (H) are pure substances. Each is made of only one type of atom, but carbon atoms are different from hydrogen atoms. Carbon and hydrogen chemically combine to form methane (CH4)

Based on this information,

A.
carbon, hydrogen, and methane are all compounds.
B.
methane is an element and carbon and hydrogen are compounds.
C.
carbon and hydrogen are elements and methane is a compound.
D.
carbon, hydrogen, and methane are all elements

Base on the information that carbon and hydrogen combined chemically to form methane, carbon and hydrogen are elements and methane is a compound

Elements

Elements are pure substance that contains only atoms that cannot be decomposed into smaller unit by chemical process.

Therefore, Carbon(C) and Hydrogen(H) are elements because they are pure substance that cannot be decompose by any chemical process.

Compounds

Compound are formed by chemically bonding two or more chemical elements together. Compounds consist of different kind of elements. Therefore, Carbon and Hydrogen combine to form a compound. This is a combination of two elements namely carbon and hydrogen.

The compound formed from this combination is methane and methane is a compound.

Therefore, carbon and hydrogen are elements and methane is a compound

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