When an electron moves from a higher energy level to a lower energy level in an atom, Choose one: A. the atom is ionized. BY. a continuous spectrum is emitted. C. a photon is absorbed. D. a photon is emitted.

Predict the reactants of this chemical reaction. that is, fill in the left side of the chemical equation. be sure the equation you submit is balanced. (you can edit both sides of the equation to balance it, if you need to.) note: you are writing the molecular, and not the net ionic equation. > cacl2(aq) + h20(l)

Ajar contains a certain substance. which observation would show that the substance must be either a solid or a liquid?

Pl what kind of reaction is this? nahco3 + h2o → co2 + naoh + h2o -composition -decomposition -single replacement -double replacement im leaning more toward single replacement. if im wrong can you explain whyy?