Find the appropriate answer to the following: - 1. a substance that can be separated into two or more substances only by a chemical change is a(n) solution/ element/ mixture/ compound 2. which of the following materials is a substance? air/gasoline/ stainless steel/ silver 3. the first figure in a properly written chemical symbol always is boldfaced/ capitalized/ italicized/ underlined 4. which of the following represents a compound? h/ h-3/ h2o/ o-16 5. what do chemical symbols and formulas represent, respectively? elements and compounds/ atoms and mixtures/ compounds and mixtures/ elements and ions