Select the elementary substance.
A: sulfur dioxide (SO2)
B: titanium (Ti)
C: silane (SiH4)
Look at the chemical formula for each substance, and count the number of symbols in the formula. Then, decide if the substance is an elementary substance. The chemical formula for sulfur dioxide contains two symbols: S for sulfur and O for oxygen. So, sulfur dioxide is made of two chemical elements bonded together. Substances that are made of two or more chemical elements bonded together are compounds. So, sulfur dioxide is a compound, not an elementary substance. The chemical formula for silane contains two symbols: Si for silicon and H for hydrogen. So, silane is made of two chemical elements bonded together. Substances that are made of two or more chemical elements bonded together are compounds. So, silane is a compound, not an elementary substance. The chemical formula for titanium contains one symbol: Ti. So, titanium is made of one chemical element. Substances that are made of one chemical element are elementary substances. So, titanium is an elementary substance.