The inner core of Earth is solid iron and nickel. Iron and nickel will melt at temperatures around 1,500°C. The average temperature of the inner core is about 5,000°C. Why then, does the inner core not melt and become a liquid?
O A. The inner core isn't hot enough to melt iron or nickel.
OB. It is impossible to melt iron or nickel because they are metals.
C. The extreme pressure at the center of the Earth keeps the core solid.
D. The outer core is so cold that it keeps the inner core solid.

The small bags of silica gel you often see in a new shoe box are placed there to control humidity. despite its name, silica gel is a solid. it is a chemically inert, highly porous, amorphous form of sio2. because water vapor readily adsorbs onto the surface of silica gel, it acts as a desiccant. despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided you should be able to make an educated guess about the thermodynamic characteristics of the process. predict the signs for δg, δh, and δs for the adsorption of water.

The ammonia molecule in the diagram has the observed bond orientation because

Rank substituents in order of their priority when assigning the e or z label to an alkene. i, ch2i , h, ch2ch2cl, f