You have 4.872 x 10^34 atoms of copper. how many moles is this? a. 7.666 x 10^32 mol b. 2.933 x 10^58 mol c. 1.237 mol d. 8.093 x 10^10 mol

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

Compare and contrast physical changes with chemical changes.

The tendency of water molecules to stick together is referred to as a) adhesion b) polarity c) cohesion d) transpiration e) evaporation