Some substances have the same chemical composition, but their atoms are arranged differently. a classic example is carbon. a pencil lead is made of graphite, which contains only carbon atoms. a diamond also contains only carbon atoms. however, the carbon atoms in a diamond are packed more closely together. would you expect the density of graphite and a diamond to be the same? explain your answer.

Asap time is ! best answer gets compose at least one well-developed paragraph on the following: define the term concurrent powers, and give an example of a concurrent power of government.

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.

What happens to the vapor pressure of a substance when its surface area is increased at constant temperature?