Professor apontando para uma fórmula molecular no quadro negro explicando sobre as ligações entre átomos - Banco de fotos e imagens

Student hands writing structural formula on the blackboard

Chemical formulas on the blackboard

Abstract science and chemical molecule structure on white board in school classroom background

Classroom desk and drawn blackboard of chemistry teaching with books and instruments. Chemical sciences education concept. Horizontal composition. Front view

Classroom. School books on desk, education concept

Molecule models and formulas on blackboard background

Young boy doing chemistry standing at the blackboard writing a formula on the board

Pretty female student puzzling a chemistry question standing against a blackboard with a drawing of a chemical formula with a thoughtful expression

Laboratory glassware and liquid formula in chemistry class

Smiling teacher writing chemical formula on the blackboard

Arm and hand in front of a blackboard

Smart prioud boy writing a formula on the chalkboard at Chemistry class

Rear view mature male teacher holding paper while writing on chalkboard in classroom

One vacant student desk in the classroom with an open binder containing class notes in front of a green blackboard

Male teacher writes on blackboard with a chalk

Male professor looking at test tube while wearing protective glasses at desk in classroom