Asubstance is composed of only one kind of atom and cant be separated into simpler substances or converted into another substance by chemical processes. under which category would you classify this substance

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this