Based on the data thomson collected in his experiments using cathode rays, the concept of atomic structure was modified.
which of the following statements about the atomic structure were validated by his cathode ray experiments?

a. particles of the cathode rays are fundamental to all matter.
b. in the atom, the particles of the cathode rays are embedded in a diffuse cloud of positive charge.
c. matter contains a negative charge and by inference positive charge.
d. there are subatomic size particles in an atom.
e. cathode rays have mass.

Which is the most likely way an automotive engineer would use chemistry

Why is the vapor pressure of a warm lake higher than the vapor pressure of a cold lake? o a. warm water has a greater heat of vaporization. ob. warm water evaporates more quickly. cool water evaporates more quickly. od. cool water has a greater heat of vaporization.

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.