A physical change is when the atoms combine to create a new product. >True
>False

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?

How air particles exert a pressure on the inside of the balloon

Compare and contrast physical changes with chemical changes.