Scientist dropping the reagent into test tube for reaction testing in chemical laboratory
Mixing of alkali and phenolphthalein solution, chemical reaction. The test tube is close-up
Scientists discuss results of reaction of chemical liquids in test tubes
Woman observing chemical reaction with test tube
Chemistry analysis. Test tube. Laboratory research. Blue liquid swirling in laboratory flask. Chemical test. Modern laboratory equipment. Chemical reaction. Chemistry experiment. Medical experiment
Chemical reaction on a black background between ammonia and hydrogen chloride. Smoke without fire. The test tube is close-up
Yellow chemical reaction in a test tube in a laboratory stirred by a magnetic stirrer
Man in medical gown and glasses watching chemical reaction in test tube
Researcher pours chemicals from a test tube into a flask, triggering an intense chemical reaction
Scientist pours chemicals from a test tube into a flask, triggering an intense chemical reaction
Chemical process. Action. Chemical reaction with blue bubbling water in a special test tube.
Chemical reaction. Stock footage. Small test tubes are tested with special solutions that boil.