illustrate the law of law of multiple proportions using the formation of SO2 and SO3 by sulphur and oxygen.

Asample of the male sex hormone testosterone, c19h28o2, contains 3.88×10^21 atoms of hydrogen.(a) how many atoms of carbon does it contain? (b) how many molecules of testosterone does it contain? (c) how many moles of testosterone does it contain? (d) what is the mass of this sample in grams?

The drawing represents the movement of particles in a substance. what changes of state can this substance undergo

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy