2025-07-09

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Chemistry in a Nutshell

Put your knowledge to the test with these Bohr model practice problems! In this video, we walk step-by-step through two classic calculations involving electron transitions in the hydrogen atom.

Perfect for general chemistry students, this clear explanation covers:

0:00 Problem 1: Energy of e- in H with n=3

1:40 Problem 2: e- in H transitions from n=4 to n=2

2:00 Problem 2a: Energy absorbed or emitted?

2:19 Problem 2b: Energy in joules?

4:14 Problem 2c: Wavelength?

5:44 Problem 2d: What part of EM spectrum?

5:57 Limitations of Equations!

Related concepts video 👉 /youtube/video/ccpnNyhyxwo

Problem 1: What's the energy in joules (J) of an electron in a hydrogen atom with n=3?

Problem 2: An electron in a hydrogen atom transitions from n=4 to n=2.

a) Is energy absorbed or emitted?

b) What's the energy in joules?

c) What's the wavelength in meters?

d) In what part of the electromagnetic spectrum do we find this radiation? What color?

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PATREON: https://www.patreon.com/c/ChemistryinaNutshell

Citations:

OpenStax Chemistry 2e. Flowers, P., Theopold, K., Langley, R., & Robinson, W.R. (2019, Feb 14). Chemistry 2e. OpenStax. https://openstax.org/details/books/chemistry-2e

OpenStax Chemistry 2e, Figure 6.13 Compare the two types of emission spectra: continuous spectrum of white light (top) and the line

spectra of the light from excited sodium, hydrogen, calcium, and mercury atoms. Continuous spectrum and emission spectrum of calcium were used to show continuous and discrete spectra of a rainbow.

OpenStax Chemistry 2e, Figure 6.3 Portions of the electromagnetic spectrum are shown in order of decreasing frequency and increasing wavelength. (credit “Cosmic ray": modification of work by NASA; credit “PET scan": modification of work by the National Institute of Health; credit “X-ray": modification of work by Dr. Jochen Lengerke; credit “Dental curing": modification of work by the Department of the Navy; credit “Night vision": modification of work by the Department of the Army; credit “Remote": modification of work by Emilian Robert Vicol; credit “Cell phone": modification of work by Brett Jordan; credit “Microwave oven": modification of work by Billy Mabray; credit “AM radio": modification of work by Dave Clausen)

Music:

Banjo Fever by Alexander Nakarada (CreatorChords) | https://creatorchords.com

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