Hydrocarbons - Alkanes Helping students learn the chemical formula of the alkane hydrocarbon series. Simple drag and drop exercise. Drag Chemical formula to their names Methane Ethane Propane Butane Pentane Hexane Heptane Octane Nonane Decane CH4 C2H6 C3H8 C4H10 C5H12 C6H14 C7H16 C8H18 C9H20 C10H22