Caucasian high school chemistry teacher demonstrates how to make brass by combining zinc and copper. Here she is dipping the copper penny into an evaporating dish with Zn and NaOH for several minutes until it coats the penny with zinc atoms. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Hutchings, Richard |
Taille de l’image : | 5825 px × 4088 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |