English Vocabulary Flash Cards - Chemical Formulas @ englishpdf.com and englishteststore.com File 033 CCl4 carbon tetrachloride or tetrachloromethane CFCl3 freon-11 CFCl2CF2Cl freon-13 CHCl3 chloroform or trichloromethane or methyl trichloride CHO2− formate ion CH2CHCHCH2 1,3-butadiene CH2CO ketene CH2ClCOOH chloroacetic acid