Chemistry 221 L1 Video Lecture from October 3, 2025.

This video covers material from Chapter 2 and Chapter 3 including the molar mass of compounds, light and electromagnetic radiation, frequency, wavelength, the speed of light, Planck's constant, and more.

CH 221 website: https://mhchem.org/221

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Chemistry 221 L2 Video Lecture from October 2, 2025, Part 4 of 4.

This video covers material from Chapter 3 including the Bohr model for the atom, sharp line spectra, absorbance and emission, calculating the wavelength and frequency from a change in energy, and more.

CH 221 website: https://mhchem.org/221

Let me know if you have any questions! Peace!

Chemistry 221 L2 Video Lecture from October 2, 2025, Part 3 of 4.

This video covers material from Chapter 3 including a discussion of light, electromagnetic radiation, frequency and wavelength, the speed of light and Planck's constant and more.

CH 221 website: https://mhchem.org/221

Let me know if you have any questions! Peace!

Chemistry 221 L2 Video Lecture from October 2, 2025, Part 2 of 4.

This video covers material from Chapter 2 including a discussion of the mole and Avogadro's number, the importance of the atomic mass number with relationship to molar mass, calculating the molar mass of a compound, and more.

CH 221 website: https://mhchem.org/221

Let me know if you have any questions! Peace!

Chemistry 221 L2 Video Lecture from October 2, 2025, Part 1 of 4.

This video covers material from Chapter 2 including an overview of the atom, protons, neutrons, electrons, the atomic number, the mass number, isotopes, atomic mass, and more.

CH 221 website: https://mhchem.org/221

Let me know if you have any questions! Peace!

Chemistry 221 L1 Video Lecture from October 1, 2025.

This video covers material from Chapter 2 including the importance of atomic mass, how atomic mass is calculated, the 7 diatomics, molecular formulas and empirical formulas, the mole, Avogadro's number, and more.

CH 221 website: https://mhchem.org/221

Let me know if you have any questions! Peace!

Chemistry 221 L1 Video Lecture from September 29, 2025.

This video covers material from Chapter 2 including the composition of the atom (protons, neutrons and electrons), the atomic number, the Rutherford Gold Foil experiment, atomic mass, and more.

CH 221 website: https://mhchem.org/221

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Chemistry 221 L1 Video Lecture from September 26, 2025.

This video covers material from Chapter 1 (and a small bit from Chapter 2) including measurements in chemistry, precision and accuracy significant figures, rounding of numbers, mass percentages, and more.

CH 221 website: https://mhchem.org/221

Let me know if you have any questions! Peace!

Chemistry 221 L2 Video Lecture from September 25, 2025, Part 3 of 3.

This video covers material from Chapter 1 including measurements in chemistry, precision and accuracy significant figures, rounding of numbers, mass percentages, and more.

CH 221 website: https://mhchem.org/221

Let me know if you have any questions! Peace!