Mr. green gave his students a set of items.

they had a toothpick, pencil, paper clip, safety pin, nail, and dime. he also gave them a magnet. he told them to predict which items are magnetic.

how can they test their predictions?
a.
see which items stick to the magnet
b.
measure each of the items
c.
see which items stick to the pencil
d.
weigh each of the items

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.