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Chlorofluorocarbons (CFCs): when derived from methane and ethane these compounds have the formulae CCl m F 4−m and C 2 Cl m F 6−m, where m is nonzero. Hydro-chlorofluorocarbons (HCFCs): when derived from methane and ethane these compounds have the formula CCl m F n H 4−m−n and C 2 Cl x F y H 6−x−y, where m, n, x, and y are nonzero.
Together these laws cover over 20.6 million people, or about 53% of the state's population. The city of Berkeley passed the nation's first polystyrene foodware ban in 1988, while also requiring all disposable foodware to be degradable or recyclable. Connecticut — Hamden, Groton, [103] Norwalk, [104] Stamford, [105] and Westport [106] have all ...
Making organic fluorides is the main use for hydrofluoric acid, consuming over 40% of it (over 20% of all mined fluorite). Within organofluorides, refrigerant gases are still the dominant segment, consuming about 80% of HF. Even though chlorofluorocarbons are widely banned, the replacement refrigerants are often other fluorinated molecules.
These include chlorofluorocarbons and hydrofluorocarbons, both of which cause ozone depletion (although the latter much less so) and contribute to global warming. 'Freon' is the brand name for the refrigerants R-12 , R-13B1 , R-22 , R-410A , R-502, and R-503 manufactured by The Chemours Company, and so is not used to label all refrigerants of ...
Or what everyday life was like for people living 50, 100, or more years ago. There’s an online community dedicated to sharing photos, scanned documents, articles, and personal anecdotes from the ...
They are widely used in the electronics, cosmetics, and pharmaceutical industries, as well as in refrigeration when combined with other gases. PFCs were commonly used as fire extinguishants in the past and are still found in older fire protection systems. They are also a by-product of the aluminium smelting process.
By projecting all three images onto a screen simultaneously, he was able to recreate the original image of the ribbon. #4 London, Kodachrome Image credits: Chalmers Butterfield
The synthetic opioid is what’s known as a partial agonist — meaning there’s a limit to how much the medication can affect people who use it. In the U.S., buprenorphine is mainly sold under the brand name Suboxone, in which form it’s combined with naloxone, the drug that can reverse the effects of an overdose.