Do you Know the Formula of Ammonia? Or Hydrogen Peroxide? What is the Structure of Benzene? Learn more than 300 chemical substances that are studied in introductory and advanced chemistry classes. There are four large levels: 1. Inorganic Chemistry: compounds of metals (such as lithium hydride LiH) and non-metals (carbon dioxide CO2); inorganic acids (for example, sulfuric acid H2SO4), salts (including common salt - sodium chloride NaCl), and polyatomic ions. 2. Organic Chemistry: Hydrocarbons (from methane to naphthalene) and carboxylic acids (from formic to benzoic acid). Natural products, including 20 common amino acids and nucleic bases that are part of RNA and DNA molecules. You can also study the most important functional groups and classes of organic compounds. 3. All 118 chemical elements and the periodic table: the questions are divided into Periods 1–7. 4. Mixed compounds: * systematic and trivial names; * structures and formulas; * organic, inorganic, and organometal...