Complete the statement.
Hydrazine is ().
A: an elementary substance
B: a compound
You can tell whether hydrazine is an elementary substance or a compound by counting the number of symbols in its chemical formula. A symbol contains either one capital letter or a capital letter followed by one or two lowercase letters.
The chemical formula for hydrazine is N2 H4. This formula contains two symbols: N for nitrogen and H for hydrogen. So, the formula tells you that hydrazine is made of two chemical elements bonded together.
Substances made of two or more chemical elements bonded together are compounds. So, hydrazine is a compound.