19. what is the density of a 16.39
g sample of a liquid whose
volume reads 18.00ml?

this is probably simple, but my brain ain't working at 12: 00 am

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

The biosphere of the earth is made up of what compound? organic or inorganic?

Does the number of ions in solution increase, decrease, or remain constant? it continuously decreases. it continuously increases. it decreases at first, then increases. it increases at first, then decreases.