https://www.khanacademy.org/science/organic-chemistry/spectroscopy-jay/proton-nmr/v/hydrogen-deficiency-index 2023-12-04T19:02:25.924542584Z Hydrogen deficiency index Leanr how to relate molecular structure with the molecular formula using the hydrogen deficiency index (or number of degrees of unsaturation). Jay video https://cdn.kastatic.org/googleusercontent/2jegbCEM83fZhEifm0_JsG58xnwuu-MG4J69NcppoT5qJWYPhGfryfTtW53mbx2RxmKGX-rcEqQ64EypUuIXRVv6Ng Hydrogen deficiency index Leanr how to relate molecular structure with the molecular formula using the hydrogen deficiency index (or number of degrees of unsaturation). https://cdn.kastatic.org/ka-youtube-converted/5bWxTfRZx70.mp4/5bWxTfRZx70.mp4 531 Structural determination of compounds using spectroscopic Techniques https://www.khanacademy.org/science/organic-chemistry/gen-chem-review/dot-strcutures-jay/v/dot-structures-ii-multiple-bonds-1 2021-03-22T03:07:32Z Dot structures II: Multiple bonds How to draw double and triple bonds using dots to represent valence electrons. Jay video https://cdn.kastatic.org/googleusercontent/EH6iVAnuJGvq_GVcqyviOu11WQfLZXuh2dFJF7R26bfxsMsk0tvElR2WmRhToK0vD9kbsOfzaVGDwP2DyCrWRVf9 Dot structures II: Multiple bonds How to draw double and triple bonds using dots to represent valence electrons. https://cdn.kastatic.org/ka-youtube-converted/WLGTx6sSIOc.mp4/WLGTx6sSIOc.mp4 359 Structural determination of compounds using spectroscopic Techniques https://www.khanacademy.org/science/organic-chemistry/spectroscopy-jay/infrared-spectroscopy-theory/v/introduction-to-infrared-spectroscopy 2023-09-10T17:11:17.624018169Z Introduction to infrared spectroscopy Explore how molecules absorb energy from infrared light, causing bonds to stretch in a process known as a stretching vibration. Understand how this concept is modeled like the oscillation of a spring. Learn about the interpretation of infrared spectra, distinguishing between the diagnostic and fingerprint regions. Uncover the relationship between wave number, frequency, and wavelength of light. Jay video https://cdn.kastatic.org/googleusercontent/nj1ks2Q_9CgwdeLv4GIiaUZhBQKVj2A1_dw0PLtfoUeRpj0SeLlRnYe4KAVGMgBDeXfjsshVkgHziwHBbFb6ZAti Introduction to infrared spectroscopy Explore how molecules absorb energy from infrared light, causing bonds to stretch in a process known as a stretching vibration. Understand how this concept is modeled like the oscillation of a spring. Learn about the interpretation of infrared spectra, distinguishing between the diagnostic and fingerprint regions. Uncover the relationship between wave number, frequency, and wavelength of light. https://cdn.kastatic.org/ka-youtube-converted/mZ-U7Qpkz8Y.mp4/mZ-U7Qpkz8Y.mp4 565 Structural determination of compounds using spectroscopic Techniques https://www.khanacademy.org/science/organic-chemistry/spectroscopy-jay/infrared-spectroscopy-theory/v/ir-spectra-for-hydrocarbons 2023-09-10T17:11:17.624018169Z IR spectra for hydrocarbons Learn how to interpret IR spectra of hydrocarbons containing single, double, and triple carbon-carbon bonds. See how the hybridization state of carbon affects the wavenumber in a carbon-hydrogen bond stretch. Uncover the relationship between bond strength, frequency, and wavenumber as you explore real-life examples, comparing alkanes, alkynes, and alkenes. Jay video https://cdn.kastatic.org/googleusercontent/raVX4e4ED28qB2rzfKyTyZs9FUW_YyctLNIGz4lS6PmlzkGPUdZPEezsbxzF8TP4Tt33oiRt0Cr_k-TC-vh1hCpB IR spectra for hydrocarbons Learn how to interpret IR spectra of hydrocarbons containing single, double, and triple carbon-carbon bonds. See how the hybridization state of carbon affects the wavenumber in a carbon-hydrogen bond stretch. Uncover the relationship between bond strength, frequency, and wavenumber as you explore real-life examples, comparing alkanes, alkynes, and alkenes. https://cdn.kastatic.org/ka-youtube-converted/_nzaMQKpPLM.mp4/_nzaMQKpPLM.mp4 782 Structural determination of compounds using spectroscopic Techniques https://www.khanacademy.org/science/organic-chemistry/spectroscopy-jay/proton-nmr/v/introduction-to-proton-nmr 2023-09-10T17:11:17.624018169Z Introduction to proton NMR Explore the concept of proton nuclear magnetic resonance (NMR) and its role in understanding molecular structures. Learn how a proton's spin creates a magnetic field, leading to alpha and beta spin states. Discover how energy absorption can flip a proton from one state to another, providing key insights for NMR studies. Jay video https://cdn.kastatic.org/googleusercontent/JRRq_FS2CTtpLxBIwqIaQBWj6VIqYvzJIGKiNsdH2buQ-bPejVelg_imCrS5o3k7dVAxxCEzuE_D3QAJXi66PRGj Introduction to proton NMR Explore the concept of proton nuclear magnetic resonance (NMR) and its role in understanding molecular structures. Learn how a proton's spin creates a magnetic field, leading to alpha and beta spin states. Discover how energy absorption can flip a proton from one state to another, providing key insights for NMR studies. https://cdn.kastatic.org/ka-youtube-converted/jjcHZuTGWXk.mp4/jjcHZuTGWXk.mp4 627 Structural determination of compounds using spectroscopic Techniques https://www.khanacademy.org/science/organic-chemistry/spectroscopy-jay/infrared-spectroscopy-theory/v/bonds-as-springs 2023-09-10T17:11:17.624018169Z Bonds as springs Learn how frequency of bond vibration can be compared to the oscillation of a spring by using Hooke's law. Explore how the strength of the bond and the mass of the atoms affect the frequency of vibration. The concept of reduced mass is introduced for situations where both atoms in a bond are moving. Jay video https://cdn.kastatic.org/googleusercontent/PLavqh7eAKknS0gtWv-Ftdc-tTgTBbTQVH_IhAd2yDbuW1O3hrdk3WhxRpZD2DfEwT9q9VvpnoDZLm9QbDK0dAexhw Bonds as springs Learn how frequency of bond vibration can be compared to the oscillation of a spring by using Hooke's law. Explore how the strength of the bond and the mass of the atoms affect the frequency of vibration. The concept of reduced mass is introduced for situations where both atoms in a bond are moving. https://cdn.kastatic.org/ka-youtube-converted/ETdNsO7mKXM.mp4/ETdNsO7mKXM.mp4 740 Structural determination of compounds using spectroscopic Techniques https://www.khanacademy.org/science/organic-chemistry/spectroscopy-jay/infrared-spectroscopy-theory/v/ir-spectra-practice 2023-09-10T17:11:17.624018169Z IR spectra practice Practice identifying compounds that correspond to a specific IR spectrum. Jay video https://cdn.kastatic.org/googleusercontent/PwWPUch65KlZGu6mp-ovp7q1WDqESqXXoFIhe9ER6dDz6FmwDfOVy5U_bzpbmC_-CpBxbtbs6R-rjup1L-PBmv_1Ww IR spectra practice Practice identifying compounds that correspond to a specific IR spectrum. https://cdn.kastatic.org/ka-youtube-converted/mJt1QI-yDG4.mp4/mJt1QI-yDG4.mp4 354 Structural determination of compounds using spectroscopic Techniques https://www.khanacademy.org/science/organic-chemistry/spectroscopy-jay/uv-vis-spectroscopy/v/uv-vis-spectroscopy 2023-09-10T17:11:17.624018169Z UV/Vis spectroscopy Introduction to UV/Vis spectroscopy and how this technique is used to analyze molecules with electrons in pi orbitals and nonbonding orbitals. Explore this through a sample analysis of  the absorption spectrum of 1,3-Butadiene, discussing the concept of molecular orbitals and the energy difference between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO). It also explores how energy and wavelength are inversely proportional. Jay video https://cdn.kastatic.org/googleusercontent/LoljbMUuxwdQMrY0V2DqNNesmMbsNURTanTC8P-V9Gu8uzflFGSOQ-AlsS3YU27R194GtsAO-_4GaILMsej8L2I UV/Vis spectroscopy Introduction to UV/Vis spectroscopy and how this technique is used to analyze molecules with electrons in pi orbitals and nonbonding orbitals. Explore this through a sample analysis of  the absorption spectrum of 1,3-Butadiene, discussing the concept of molecular orbitals and the energy difference between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO). It also explores how energy and wavelength are inversely proportional. https://cdn.kastatic.org/ka-youtube-converted/1FQPXtN7MeI.mp4/1FQPXtN7MeI.mp4 672 Structural determination of compounds using spectroscopic Techniques https://www.khanacademy.org/science/organic-chemistry/spectroscopy-jay/uv-vis-spectroscopy/v/absorption-in-the-visible-region 2023-09-10T17:11:17.624018169Z Absorption in the visible region Explore the physical basis of our perception of color through the example of beta carotene, the molecule that gives carrots their orange color. Beta carotene absorbs light in the visible region of the electromagnetic spectrum at wavelengths of approximately 450 to 500 nanometers, which corresponds to blue light. As a result, the orange wavelengths are reflected, making beta carotene appear orange to our eyes. Jay video https://cdn.kastatic.org/googleusercontent/-BVqSwaO5Of4Om478NOZvpaxjidbpl8aPEJftZ4hZwyzP0Rmv_1nlC30V1l0zqpWmvM9FnLJ-qRmg3JdkbJBfsP8 Absorption in the visible region Explore the physical basis of our perception of color through the example of beta carotene, the molecule that gives carrots their orange color. Beta carotene absorbs light in the visible region of the electromagnetic spectrum at wavelengths of approximately 450 to 500 nanometers, which corresponds to blue light. As a result, the orange wavelengths are reflected, making beta carotene appear orange to our eyes. https://cdn.kastatic.org/ka-youtube-converted/5HMMfiyszjo.mp4/5HMMfiyszjo.mp4 311 Structural determination of compounds using spectroscopic Techniques https://www.khanacademy.org/science/grade-12-chemistry-snc-aligned/x7a43e770fc9e15cf:spectroscopy/x7a43e770fc9e15cf:structural-determination-of-compounds-using-spectroscopic-techniques/a/spectroscopy-interaction-of-light-and-matter 2021-04-29T07:57:33Z Spectroscopy: Interaction of light and matter How UV-Vis and IR radiation can be used to chemical structure and concentrations of solutions article https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atomic-models-and-periodicity/x2613d8165d88df5e:the-bohr-model-and-atomic-spectra/a/absorptionemission-lines 2024-11-11T03:02:04.50965229Z Absorption/emission lines Learn why every element has a unique emission/absorption spectrum, and how we can use spectral lines to identify the composition of an object. article https://www.khanacademy.org/science/grade-12-chemistry-snc-aligned/x7a43e770fc9e15cf:spectroscopy/x7a43e770fc9e15cf:structural-determination-of-compounds-using-spectroscopic-techniques/e/infrared-and-ultraviolet-visible-spectroscopy-questions 2026-04-08T00:16:02.937952483Z Infrared and Ultraviolet/Visible spectroscopy questions Infrared and Ultraviolet/Visible spectroscopy questions Sze Yan exercise https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atomic-models-and-periodicity/x2613d8165d88df5e:the-bohr-model-and-atomic-spectra/e/apply-atomic-spectra 2026-03-18T09:00:44.76761874Z Apply: atomic spectra Apply your understanding of atomic spectra in this set of free practice questions. Emily Cizmas exercise https://www.khanacademy.org/science/revision-term-1-tg-chemistry-class-11/x3f2cd496ba25689a:week-1/x3f2cd496ba25689a:atomic-structure/e/line-spectra 2026-04-07T23:36:17.218592739Z Line Spectra Exercise on Line Spectra, Hydrogen Spectrum, Atomic Structure Chapter. aman saurav exercise