An atomic emission spectrum of hydrogen shows three wavelengths: 121.5 nm,102.6 nm, and 97.23 nm

Assign these wavelengths to transitions in the hydrogen atom.

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We have that wavelengths to transitions in the hydrogen atom.

From the question we are told that

121.5 nm,102.6 nm, and 97.23 nm

Generally the equation for wavelength  is mathematically given as

Therefore

For nf=2,ni=1

For ni=1,nf=3

For ni=1,nf=4

Therefore

The Correct slots are

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"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.