What is the pH of a 0.250 M solution of methylamine ( CH_3NH_2, K_b=4.4 \times 10^{-4} )? If a carbon atom has four valence electrons, which of the following statements are true? I. Carbon can form a triple covalent bond with ...
So carbon's outer shell (n=2) has 4 electrons. The 2s subshell is full, but the 2p subshell can have 6 electrons, so when C bonds it tends to pick up the 4 electrons it needs to fill the shell, giving it a total of 8 valence electrons (mind you, there will not always be 8 ...
The basic principle of radiation therapy is to deliver energy to cancer cells through ionizing radiation. Radiation directly or indirectly interacts with the body's cells (when radiation passes through, its energy knocks out orbital electrons in atoms and separates them into cations, free electrons, ...
htm. Phenols are much more acidic than alcoholsbecause the negative charge in the phenoxide ion is not localized on the oxygen atom, as it is in an alkoxide ion, but is delocalized-it is shared by a number of carbon atoms in the benzene ring. Why phenols are more acidic than alcohols e...
d. changing the carbon source between the inoculum and the medium. Determine the speed of the following mass wasting event: Creep a. slow b. fast The half life of a certain substance is 19 years. Use the exponential decay model A = A_0 e^...
The reason is simple. Some 15 years ago I wrote to Sir John Houghton, then chairman of IPCC’s climate “science” panel, and asked him why, given that direct warming by doubled CO2in the air was little more than 1 K, it was imagined that final warming was 3 or 4 K. Sir John...
Electricity and heat production are the largest sources of greenhouse gas emissions in the world. Carbon-free electricity will be critical for keeping the average global temperature rise to within the United Nations’ target of1.5 degrees Celsiusand avoid the worst effects ofclimate change. As world...
Likewise the whole point of having your registration number on the ticket, is so that you cannot pass the excess time left on the ticket onto someone else. Hospital car parks are an excellent example of having to guess the time or be fined, when the appointment overrunning, is nothing to ...
I might imagine one of these ways and say something like, “she could probably shift her own electrons around in patterns and create all different kinds of outgoing waves,” but again, that’s what my human brain can come up with. She’d be way better. Likewise, Turry would be able ...
Another headache is storage. When storing liquid hydrogen, some gas must be allowed to evaporate for safety reasons—meaning that after two weeks, a car would lose half of its fuel, even when not being driven. Also, Bossel found that the output-input efficiency cannot be much above 30%, ...