Ключевые слова: acid, analysis, atom, background, beaker, burner, burning, chemistry, close up, closeup, discovery, equipment, examination, examining, experiment, flame, flask, fluid, glass, glassware, hand, heat, horizontal, instrument, lab, laboratory, liquid, molecular, molecule, needle, person, professional, reactants, reaction, reagent, research, results, sample, science, scientific, structure, substance, test, tongs, torch, tube, worker,