Which describes one way that Aristarchus's explanation of the movement of objects in the sky was different from other scientists' earlier explanations? He discovered Venus’s phases. He argued that Earth rotates on its axis. He explained the concept of retrograde motion. He described the epicycles of the planets in the sky. 30 POINTS

Astudent is asked to identify and element that is pale yellow brittle solid and does not conduct electricity. at which location in this periodic table would the element most likely be found?

When a septic tank backs up a goes in to clean it out

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.