“…The studies in this category investigated a wide variety of chemistry topics: bonding, ,,,,,, nature of science, ,,,, redox and electrochemistry, ,, gas laws, , models, , kinetics, , substance and matter, , energy, , delocalization and resonance, 1 H NMR spectroscopy, protein synthesis, carbonyl chemistry, thermodynamics, acid–base chemistry, physical and chemical change, electrolysis, heat, gene function, Millikan’s oil drop experiment, practical work and laboratory procedures, air quality, industrial organic chemistry, and green chemistry . Almost half of these studies analyzed exclusively secondary chemistry textbooks, ,,,,,,,,,,,,,,,, and a substantial number of studies analyzed general ,,,,,,, or organic chemistry textbooks. ,,,, The remaining studies compared different chemistry textbooks: secondary and general chemistry textbooks, ,, secondary chemistry and biology textbooks, ,, secondary science, general chemistry, and physical chemistry textbooks, and two studies compared textbooks for more than three subjects.…”