According to collision theory, which condition(s must be met in order for molecules to react?

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

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

How are evaporation and sublimation similar? a both involve the formation of a gas. b both release energy to the surroundings. c both take place throughout a solid. d both take place at the surface of a liquid.