Which statement describes a chemical reaction at equilibrium? Reactant molecules and product molecules have the same velocity.

Molecules of reactants and products collide with the same frequency.

The concentrations of reactants and products are equimolar.

Reactants and products are consumed and formed at the same rate.

Which of the following statements is true about energy quantization at the atomic level? electrons in the outermost orbits are the most stable. electrons in all the orbits around the nucleus have the same amount of energy. electrons in the orbit closest to the nucleus have the least amount of energy. electrons absorb or release the same amount of energy independent of the energy levels.