How do glow sticks glow? and what makes them emit different colors of light?
a) An exothermic reaction excites protons in pigment molecules emitting photons of light; the energy levels of the atomic nuclei determine the frequency of light.
b) An endothermic reaction excites protons in pigment molecules emitting photons of light; the energy levels of the atomic nuclei determine the frequency of light.
c) An endothermic reaction excites electrons in pigment molecules emitting photons of light; the energy levels of the electron orbitals determine the frequency of light.
d) An exothermic reaction excites electrons in pigment molecules emitting photons of light; the energy levels of the electron orbitals determine the frequency of light.