What percent by mass water is present in CaCO3.5H2O?

If a reactant was removed, did the new equilibrium system shift to make more reactants or more products?

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.