Lección de química. Profesor masculino profesional inteligente con una bata blanca y sosteniendo un matraz químico mientras muestra una reacción química a sus estudiantes - Foto e imagen de stock

Chemistry lesson. Smart professional male teacher wearing a white coat and holding a chemical flask while showing a chemical reaction to his students

Chemistry is real magic. Male tutor wearing a laboratory coat holding a fuming vacuum flask while conducting a chemistry practical session for teenage students in the school laboratory.

Just smell it. Competent teacher holding big flask and doing experiment with reagents that providing smock

Chemical smoke. Nice intelligent bearded scientist wearing a white coat and holding a chemical flask while having an optional chemistry lesson for children

Laboratory research. Selective focus of professional equipment being in use while doing a scientific research in the lab

Irritated. Handsome angry fair-haired young blogger wearing uniform and holding test tubes and making new video

Making experiment. Blonde-haired student wearing protection glasses feeling emotional making experiment

Puzzled man smelling. Blond puzzled man smelling red reagent in glass tube during chemistry experiment

Beaming chemist holding. Beaming chemist holding test tube in one hand while recording educational video

Teacher blending reagents. Unconfident handsome teacher blending reagents in glass tubes for chemistry experiment

In high spirits. Attractive exuberant fair-haired teenager wearing a uniform and glasses and holding test tubes while doing an experiment

Interesting experiment results. Nice joyful dirty fair-haired young blogger and wearing uniform and holding test tubes while making new video