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2,2-Dichloro-1,1,1-trifluoroethane can be produced by reacting tetrachloroethylene with hydrogen fluoride in the gas phase. This is an exothermic reaction and requires a catalyst: This is an exothermic reaction and requires a catalyst:
For example, consider Halon 1211. This halon has number 1211 in its name, which tells it has 1 carbon atom, 2 fluorine atoms, 1 chlorine atom, and 1 bromine atom. A single carbon only has four bonds, all of which are taken by the halogen atoms, so there is no hydrogen. Thus its formula is CF 2 ClBr, hence its IUPAC name is ...
For example, R-22 has one carbon atom, one hydrogen atom (2−1 = 1), two fluorine atoms, and one chlorine atom (4−2−1 = 1), so it is chlorodifluoromethane, while R-134 has two carbon atoms (2−1 = 1), two hydrogen atoms (3−1 = 2), four fluorine atoms, and no chlorine atoms (6−2−4 = 0), so it is one of the tetrafluoroethanes. This ...
Aluminum can weigh from 170 to 240 grams (6.0 to 8.5 oz). Frame length ranges from two-wheel framed freestyle wheels (used in aggressive skating) to around 230 mm (9.1 in) for short-framed four wheel skates (used in most inline designs), up to about 325 mm (12.8 in) for a five-wheel racing frame.
A poll after the 2003 Maxim restaurant suicide bombing, in which 20 Israelis were killed, concluded that 75 percent of Palestinians supported the attack, with support higher "in the Gaza Strip (82%) compared to the West Bank (70%), in refugee camps (84%) compared to towns and villages (69%), among women (79%) compared to men (71%), among the ...
On 13 May, U-72 was sent to lay mines in the Firth of Forth; on the 23rd, U-74 departed to lay mines in the Moray Firth; and on the 24th, U-75 was dispatched similarly west of the Orkney Islands. UB-21 and UB-22 were sent to patrol the Humber, where (incorrect) reports had suggested the presence of British warships.
War on drugs A U.S. government PSA from the Alcohol, Drug Abuse, and Mental Health Administration with a photo image of two marijuana cigarettes and a "Just Say No" slogan Date June 17, 1971 – present (53 years, 7 months and 6 days) Location Global Status Ongoing, widely viewed as a policy failure Belligerents United States US law enforcement Drug Enforcement Administration US Armed Forces ...