What forces must be overcome for a substance to melt

__can be defined as which velocity changes

Stage in which a star’s outer layers have started to cool and grow outward?

16. in a reaction that has reached equilibrium, a. the forward and reverse reactions are occurring at the same rate. b. the reactants and products are in equal concentrations. c. the forward reaction has gone further than the reverse reaction. d. there are equal numbers of atoms on both sides of the equation. e. a, b, and d are correct.