What Scent Keeps Horseflies Away? Horseflies are painful pests that feed on the blood of all mammals, including humans. The flies trace and find their prey by targeting the prey's appearance, movement and smell. Most fly control methods target the horsefly's olfactory senses.
CFCs. Chlorofluorocarbon (CFC) is an organic compound that contains carbon, chlorine, and fluorine, produced as a volatile derivative of methane and ethane. A common subclass is the hydrochlorofluorocarbons (HCFCs), which contain hydrogen, as well.
It is the atomic chlorine that does the damage, since it can react with ozone (O 3) to form oxygen. The Cl atom is regenerated in this reaction, and so the breakup of only one CFC molecule can initiate the subsequent removal of thousands of ozone molecules.he chlorofluorocarbons (or CFCs for short) have recently received a great deal of attention, and notoriety, as a result of being implicated in the destruction of the ozone layer.