Akernel of popcorn contains a small amount of water and when heated the popcorn pops. how can you explain this to someone?

Iwll give extra points to who gets this for ! what type of reaction is this? ?

What does a numerical subscript following an element in a chemical formula mean?

The size (radius) of an oxygen molecule is about 2.0 ×10−10m. make a rough estimate of the pressure at which the finite volume of the molecules should cause noticeable deviations from ideal-gas behavior at ordinary temperatures (t= 300k ). assume that deviatons would be noticeable when volume of the gas per molecule equals the volume of the molecule itself.