Of the following, which does not signify a chemical reaction?
1) tarnish
2) release of heat
3) changing state
4) release of gas

One significant difference between an ionic bond, where electrons are taken from one atom and added to another atom, and a covalent or metallic bond, where electrons are shared is

When the speed of the bottle is 2 m/s, the average maximum height of the beanbag is m.

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.