What is the difference between a physical change in matter and a chemical change in matter

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2

Describe the forces both attractive and repulsive that occur as two atoms move closer together.