An ancient club is found that contains 200 g of pure carbon and has an activity of 4.5 decays per second. determine its age assuming that in living trees the ratio of atoms is about . note that the half life of carbon-14 is 5700 years and the avogadro number is

If the same amount of cacl2 is added to equal volumes of water and maple syrup, which will have the higher temperature?

What produces wave a)sound b) heats c)transfer of energy d)vibrations

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.