AP® Chemistry: Bonding, Hybridization, Intermolecular Forces, Enthalpy
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- Опубліковано 5 сер 2024
- tdwscience.com/apchem
This video covers is an example for a long format free response question for the AP® Chemistry exam. It covers a variety of topics that include: Lewis Structures, Hybridization, Bond Angles, Intermolecular Forces, Hydrogen Bonding, Dipole-Dipole Interactions or Attractions, Boiling Point, Melting Point, Enthalpy of Formation Calculations, and Stoichiometry. The Lewis Structures include alkanes, alcohols, carboxylic acids, and aldehydes. We discuss hybridization for molecules with sp, sp2, and sp3 states. Bond angles are for VSEPR geometries of linear (180º), trigonal planar (120º), and tetrahedral (109.5º). For the stoichometry calculations, we calculate the enthalpy of combustion and enthalpy of reaction, by summing the standard enthalpies of the products and reactants, using a table of enthalpy values.
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8:52 shouldnt it only be H bonding because mentioning hydrogen bonding implies that dipole-dipole interactions are present, as hydrogen bonding is a subset of dipole-dipole interactions
Please need an explanation on Bohr's model as it becomes very hard to understand quantized energy and angular momentum. Thanks in advance.
Thank you sir so much. Can you do about enthalpy too
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Sir, could you make a lecture on "Le Chatelier's Principle". Plz
The lone pairs in formaldehyde is not counted???
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One day before the exam, thank you
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@@birdie7344 i finished it half an hour ago. I think it went well considering i did not study much. Most importantly, there were many similar questions to the ones in these videos.
Thank you so much! You have saved me twice already just in the past two weeks. However, just one question - for 5:07, why is it not Bent, like H2O? The O in H2O also has 2 single bonds + 2 lone pairs, but H2O would be bent and
Well the bond in H2O is about 105°. Yes it is a bent geometry, but it is based on a tetrahedral geometry, which has a 109.5° bond angle. So yeah, if those electron pairs didn’t repel so much, it would be 109.5°, and 105° is close enough that the difference doesn’t matter for the test.
@@tdewitt451 I see. Thank you so much for the thorough explanation!
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3:44 shouldn't it be bent(104.5) since it has 2 lone pairs and 2 bonds?
Yes and no. The actual angle depends on the identity of the atoms. Sometimes it’s 104.5, sometimes less, sometimes more. It’s not *always* 104.5 in this case. However, the ideal theoretical is 109.5, which is why it’s acceptable to say 109.5, or “slightly less than 109.5.”
Please make a video on HYBRIDISATION...
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For the IMFs question, is it necessary to mention how both methanol and formaldehyde also have LDF attractions with the polarizability of their electron clouds? I heard that you should always mention all types of IMFs on the AP exam
You don’t need to there, because the LDF’s really aren’t relevant for explaining the *difference* in boiling points. But great question.
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Make a video on how to find no of isomers ?
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What do you think are the worst questions?
@@tdewitt451 Specifically I would have to get back to you but GENERALLY, the types which are as involved as the one discussed. A general video helping to explain and giving tips which will aid in deciphering when parts of the problem are dependent on prior parts versus independent, would go a long way to helping cure that problem.
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