CHEMISTRY COMMUNITY

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Does anyone know why we were told not to worry about titrations/we spent like 7 minutes on it and there was a whole page on the final of it? Genuinely curious,

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Can someone explain to me how this has an overall charge of 2
K4[Fe(CN)6]

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Can someone explain to me how this overall charge of this ion is 4....
[Pt(H2NCH2CH2NH2)2Cl2]Cl2

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Can someone explain to me how to determine how many coordination numbers a molecule has? I'm currently doing some homework and need some clarification.

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Do they want us to remove all the hydrogens when trying to get a conjugate base?

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Can anyone explain to me why H2SO3 is a Bronsted Acid? I tried to explain it to myself but I got more confused.

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madawy wrote:yeah, we turn in two to make up for last week.

Thank you!!

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sbeall_1C wrote:Dr. Lavelle went over pH and pOH in greater detail, and how to derive the pH scale! If you read the section on acid and base naturalization and the relationship between pH, pOH, and pKa, you should be good!

Thank you! This is helpful as well. :)

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Baoying Li 4H wrote:1. Reaction btw acid and base--Neutralization
2. Writing [H3O+] AND [OH-] as logarithms
3. Relative acidity (Binary, oxoacid, carboxylic)
Hope this helps!

Thank you!! I appreciate this.

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Does anyone know if for week 10 discussions on Thursday and Friday have to submit two separate homeworks for the last discussion?

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How can you tell what an acid and a base? Like what is an easy way of determining the difference?

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Can anyone briefly explain what Lavelle went over on the 27th of November? Just so I can read about it on the textbook/

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Are we getting tested on the io-ion interactions?? I'm looking at this forum and it seems like we are but my TA only went over three intermolecular forces and I just want to make sure because another TA went over all the bondings.

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Thank you for asking this because you weren't the only one wondering! All the responses are helpful.

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I don't think so. The way I drew that specific molecule you gave was that I put a triple bond between C and N and the H on the left side of C. I don't think the lone pairs in N account for its shape in this particular example. However, someone correct me if I'm wrong.

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I think Lavelle said that from 2D-the slide that was taught on Monday will be on the exam.

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Just to make sure once again, we do not need to know hybridization for the quiz correct??

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505106414 wrote:What is dipole-dipole? I know we talked about it a lot in class but I am still confused.

Dipole-Dipole just means a partial positive and a partial negative interaction between molecules.

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Andrew Liang 4G wrote:Another tip that I learned from my TA today was that most of the time when the central atom has lone pairs then the molecule is most likely to be polar.

Thank you so much for this! This is very helpful.

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Since there won't be anything on next week's quiz about dashes and wedges then does that mean they wouldn't ask about tetrahedral, trigonal bipyramidal or octahedral shapes? Or would they but just as 2D?

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Does anyone know if there's going to be a question on the quiz about dashes and wedges? Or anything related to that because Lavelle said not to worry about it in lecture.

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Are lone pairs considered regions of electron density?

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For H2O is there 2 regions of e- density or do you count the lone pairs?

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How to know if a molecule is polar/nonpolar? Any tips?

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Will we be given all of the equations we will need for the midterm? My TA mentioned that they wouldn't give them all so I'm kind of concerned.

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Do we have to know this for the test?

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Are we going to be tested on Van Der Waals radius specifically? I remember someone telling me Lavelle wasn't going to call it Van der Waals radius on the test.

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I don't recall if Lavelle said that this was going to be on the exam? Should I worry about learning how to use this? It was technically in section 1B but I'm still kind of concerned whether I have to know how to use this equation

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When looking through the textbook I noticed that when they calculated the molar concentration of a solute they used both the c=n/v and m=n/M.
Can anyone help me figure out why?

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We don't have to memorize the conversions right? I remember there being a reference sheet for the first quiz but I'm curious if that'll be the case for pm, micrometers, nano, etc.

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Hello, I'm looking at the learning outcomes on the Chemistry website and I was just curious to know up to which outcome are we stopping for midterm one? Is it outline 4? Thanks!

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I have a question about posting. If I'm replying to a classmate and we discuss a question do the replies count as posts? I mean, technically it's still posting and you're still engaging in discussion with the community right?

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Daria Azizad 1K wrote:No, charge will always be a whole number. Whenever we divide by two in the FC equation, the numerator will be an even number, as it refers to pairs of electrons.

What's the formal charge of NaOH?

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Can we have halves in the equation and the final answer?

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Why are cations smaller than their parent atoms? The way that my PLF told me to remember was that Cat-ions (paw-sitive) means that they're losing an electron (bc it's positive) and the Anion is like onion crying because it's gaining an electron. If it's losing an electron that means it's smaller th...

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Helium probably wouldn't bond with other elements because it is already stable as a noble gas. Noble gasses are known not to react with other elements. Okay, then let's say it's a different element like Carbon. Would it still be following the rule? Lewis structures show how atoms are bonded togethe...

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We haven't been taught how exactly to obtain measurements for bond lengths as of now. Professor Lavelle specified the different lengths to prove that double and triple bonds have higher attraction and thus shorter lengths than single bonds, and the bonds for resonance structures have lengths betwee...

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KHowe_1B wrote:Helium probably wouldn't bond with other elements because it is already stable as a noble gas. Noble gasses are known not to react with other elements.

Okay, then let's say it's a different element like Carbon. Would it still be following the rule?

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Does this also apply for Nitrogen with Hydrogen and Helium? Would Nitrogen be following the rule? When they're together doesn't the bond technically make it a pair?

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So when there's a molecule like Oxygen and Helium together in a lewis dot structure does is it valid to say that Heliums electron is part of Oxygens now and now is following the Octet rule?

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Does anyone know if Professor Lavelle is planning on uploading more video modules on to his website? Or is the "Heisenberg Uncertainty Principle" going to be the last video? Does anyone know if he's planning to upload slides to CCLE? Or has he already answered that question? It would be s...

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Can the periodic table be used to do the molecule configuration because you can use it to find out how many subshells/orbitals it has right? Please correct me if I'm wrong. Thank you!

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Does anyone have any useful youtube videos that will help me further understand the Quantum World/Orbitals/Subshells? Thanks!!

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My calculator doesn't give me the answer in scientific notation if it isn't over 10^5. Would I get points taken off if the answer is correct just not specifically in scientific notation? Would I get points taken off even if it's not asked to give an answer in scientific notation?

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Does it make it a big difference if you switch the constant from 6.626 to 6.63 for p?

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AlyshaP_3G wrote:I think the units will be clarified in the questions. If they aren't, I would probably stick to one of the more conventional ones such as m or nm!

I agree with this answer! During the quiz, they definitely clarified what to convert the units to.

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In the module, Dr. Lavelle talks about how different metals will give us different results. Where do you account for a different metal in the equation? Does it matter what metal we assume it is if it doesn't give us that information?

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When do you use the E = hν equation?

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Does anyone think we'll actually have to memorize the entire chart of the electromagnetic spectrum or even some of it?

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During the lecture, Dr. Lavelle posted on the slide show that c = fλ = 3.00 x 10^8 m.s. ^-1
Is this always true?

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During the module, Dr. Lavelle said to only worry about calculating the molar mass of each reactant and to not worry about the product... maybe I just need to keep watching the video but can anyone remind me what he said in the lecture? Does this apply to every equation?

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When you're solving a problem that has the mL unit do you convert the mL to L before you begin to do the work or do you do it after you've solved the problem? Does it matter?

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