CHEMISTRY COMMUNITY

Ethan Nishikawa 4D

"Bioengineers at Rice University have combined a virus that infects moths with magnetic nanoparticles to create a potential new therapy for inherited genetic diseases like muscular dystrophy, sickle cell, cystic fibrosis, spinal muscular atrophy and some forms of cancer." Go science! https...

Ethan Nishikawa 4D

You do not need to draw double bonds coming at you, not in this course ever. But in those cases, you would always avoid the situation by making the other bonds come at you instead of the double bond.

Ethan Nishikawa 4D

Practicing the material on your own before attending workshops gives you a better idea of questions you could ask during OA/Workshops/ReviewSessions. You can find further practice material on Chemistry community.

Ethan Nishikawa 4D

Sigma bonds are always the first type of bond that occurs between two elements. Pi bonds are always the additional bonds (For example the second bond in double bonds or second and third bond in triple bonds). Pi bonds do not allow rotation because if you tried to rotate the atoms, one would have to ...

Ethan Nishikawa 4D

https://chemistrybytes.files.wordpress. ... -table.jpg

Check out this link^

It's a chart displaying when each intermolecular forces occurs.

Ethan Nishikawa 4D

The formal charge of a molecule could be zero but still be polar. Typically, a molecule is only non-polar if there is only one type of element surrounding an atom. If there are two or more types of elements surrounding an element, the molecule will probably be polar.

Ethan Nishikawa 4D

Are we going to need to know how to find the molecular shape of molecules with more than one central atom (When the central atom A be greater than 1)?

Ethan Nishikawa 4D

For the Lewis Structure of POCl3, why is P in the middle?

Ethan Nishikawa 4D

With a double bond, the molecule would have a +2 formal charge, while with a triple bond, the molecule would have +0 formal charge. Therefore, carbon monoxide needs a triple bond to be more stable.

Ethan Nishikawa 4D

Molecular shape also may help you determine what type of molecular interactions occur between molecules.

Ethan Nishikawa 4D

Also, a helpful way to determine if an interaction is dipole-dipole is by first figuring out the shape of each molecule.

Ethan Nishikawa 4D

Yes boron is one of the elements that is part of the exception.

Ethan Nishikawa 4D

Are we expected to remember all of the shapes?

Ethan Nishikawa 4D

Also note, due to resonance, all of the bond lengths will average out to be the same length.

Ethan Nishikawa 4D

Thank you

Ethan Nishikawa 4D

Thank you guys

Ethan Nishikawa 4D

shouldn't the brackets separate each element individually?

Ethan Nishikawa 4D

The test would be during your discussion

Ethan Nishikawa 4D

This is very insightful! Thanks! In cases where you missed class, what would you do to make sure you did not fall behind? If you miss class, try to watch/listen to the Bruincast. That is the best thing you could do. Reading over the notes is good, but having Dr. Lavelle explain it takes it to a who...

Ethan Nishikawa 4D

A coordinate covalent bond is an electron covalent bond where 2 electrons derive from the same atom. Specifically, this relates to Lewis Acid-Base reactions (Group 13 elements - B, Al, etc) and how they can be stable without satisfying the octet rule. For example, BF3 is stable even though B only ha...

Ethan Nishikawa 4D

Is your question more specifically about cases where compounds are stable on their own without the double/triple bonds?

Ethan Nishikawa 4D

Boron is in group 13 along with Aluminum. They both need 5e- to complete their octet and are apart of a class of Acid-Base reactions. Boron in BF3 only completes its octet if another atom provides both e- to form a coordinate covalent bond.

Ethan Nishikawa 4D

Ok cool thank you

Ethan Nishikawa 4D

This is very insightful! Thanks! In cases where you missed class, what would you do to make sure you did not fall behind?

Ethan Nishikawa 4D

Are we expected to know the conversion from eV to J?

Ethan Nishikawa 4D

Ok thank you

Ethan Nishikawa 4D

Thanks! But dang, we need to know all the way from y-ray to radio?

Ethan Nishikawa 4D

Q: Did you hear about Potassium's date with Oxygen?
A: Yeah, I heard it went OK.

Ethan Nishikawa 4D

Q: Want to hear a joke about sodium, bromine, and oxygen?
A: NaBrO!

Ethan Nishikawa 4D

Q: What should you do if nobody laughs at your chemistry jokes?
A: Keep telling them until you get a reaction!

Ethan Nishikawa 4D

The syllabus says the midterm is 2 hours long, but discussions/lectures are no longer than 50minutes. When and where is the midterm?

Ethan Nishikawa 4D

Are we supposed to remember which type of wave (visible, UV, x-ray, etc) correlates with each frequency/wavelength?

Ethan Nishikawa 4D

We will not be allowed to use graphing calculators as Lavelle said people could use them to record formulas and store functions, but we will be able to use scientific calculators.

Ethan Nishikawa 4D

Yeah we do not need to memorize the molar masses of each element, however, as we progress in this course it will be helpful to know the molar masses for some of the more basic elements such as H, O, C, etc. This will save time during tests and quizzes.

Ethan Nishikawa 4D

Yes, the molar mass of the element needs to be multiplied by the subscript in order to find the chemical formula.

Furthermore, the subscript indicates the number of moles.

Ethan Nishikawa 4D

Are we expected to remember the conversion of units from picometer (pm) to meters (m)?

CHEMISTRY COMMUNITY

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Re: Chemistry News

Re: how to draw a double bond that is coming at you

Re: Final Review

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Re: Intermolecular forces

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VSEPR

Lewis structure for POCl3

Re: Lewis Structure of Carbon Monoxide

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Re: Advice from a Medical Student [ENDORSED]

Expected to know?

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Midterm

Expected to know?

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pm to m