Iron (fe) undergoes an allotropic transformation at 912c: upon heating from a bcc (α phase) to an fcc (γphase). accompanying this transformation is a change in the atomic radius of fe—from rbcc= 0.12584 nm to rfcc= 0.12894 nm—and, in addition a change in density (and volume). compute the percent volume change associated with this reaction. does the volume increase or decrease? given that fcc is a more close-packed structure than bcc, does the answer surprise you?

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

Aviolently rotating column of air is formed around a region of extremely low air pressure above land. which of these weather conditions is most likely to follow? blizzard cyclone tornado hurricane

An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?