Molecular models of assorted chlorofluorocarbons (CFCs),showing the positions of the carbon (black),hydrogen (white),chlorine (dark green) & fluorine (red) atoms. The three smaller molecules all have an extra chlorine atom hidden from view behind the central carbon atom. At upper left is trichlorofluoromethane (CFCl3),used for blowing foams,& at lower left is dichlorodifluoromethane (CF2Cl2),which is used in refrigeration. At lower right is trichloromethane (chloroform,CHCl3) & at upper right is tetrachlorofluoro- ethane. Atmospheric pollution by CFCs is thought to be responsible for the annual appearance of a hole in the ozone layer over Antartica | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Hart-Davis, Adam |
Bildgröße: | 4817 px × 3720 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |