What process accompanies the transition of a hydrogen electron from n=5 to n=3?

Molecular level views of three aqueous solutions (AX, AY, and AZ) are shown below: Which of these solutions could be a strong acid?

Molecular level views of three aqueous solutions (A, B, and C) are shown below (H2O molecules have been omitted for clarity, and because I’m lazy…): Which of these solutions could represent a weak acid?

If a particular process occurs at constant pressure and there is no change in enthalpy (∆H=0), what can you conclude about ∆E, q, and w?

Which of the following metals will be oxidized by ions of aluminum in solution?

For which of the following reactions is the value of ∆Hºrxn equal to ∆Hºf for the product?

How much work (in kJ) is done during a reaction in which the internal volume expands from 19 L to 48 L against an outside pressure of 2.5 atm?

Which of the following combinations of aqueous solutions will form a precipitate?

What is the frequency (in Hz) of a photon of light with an energy of 3.7 x 10-18 J?

Arrange the following types of electromagnetic radiation in order of decreasing frequency: