(e) Predict one difference in the appearance of aqueous solutions of nickel compounds compared to aqueous solutions of sodium compounds.
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Arock can be broken down into different kinds of substances by physical processes. no chemical reactions are needed to separate different parts of a rock into pure substances. this is because a rock is a(n)

Smog is the term used to describe the combination of fog and smoke

Calculate the energy required to ionize a hydrogen atom to an excited state where the electron is initially in the n = 5 energy level. report your answer in kilojoules