Which option is an example of a chemical change? A spreading peanut butter

B cutting bread

C digesting a sandwich

D stirring jelly

Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in the n=3 level to an orbital in the n=7 level.

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?

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