CHEMISTRY COMMUNITY

LeAirraBullingor2k

On the homework problem 5g.13, how do we calculate gibbs free energy if we arent given the value of RT?

LeAirraBullingor2k

What does it mean when it says the heat capacity of the ideal gas is independent of temperature?

LeAirraBullingor2k

When will work be negative? Like how will we know whether to keep the negative number or not?

LeAirraBullingor2k

Is the answer to part B of this question wrong in the answer key? I'm getting 490 J and I don't see how 90x10^2 would be the answer.

LeAirraBullingor2k

Not only should you attend the review sessions but also work out as many homework problems as you can! Sometimes test questions will be based on homework problems and it'll help you grasp the concepts.

LeAirraBullingor2k

Hess's law allows us to calculate the total enthalpy change in a reaction regardless of what steps had to be taken to get to a certain chemical equation.

LeAirraBullingor2k

Is it possible to attend a PLF session you are not enrolled in? I have one but cannot make the other day that my PLF has set up.

LeAirraBullingor2k

What is the quickest way to go about solving these types of problems?

LeAirraBullingor2k

How do we calculate the heat of a closed system vs an open system?

LeAirraBullingor2k

Is it okay to do homework problems from Acids and Bases for homework 3?

LeAirraBullingor2k

How do we calculate the molar concentration of H₃O given just the K_w?

LeAirraBullingor2k

Since solids are not used to calculate K, when using ICE tables do we just put a 0 for initial concentration?

LeAirraBullingor2k

Can anyone help me to understand how they got 6.9 as the answer to the first part of the question?

LeAirraBullingor2k

Acids will be the ones donating hydrogen ions and bases will be accepting them

LeAirraBullingor2k

What are the steps to determining which way the reaction is going? Isn't it just product over reactants and for gases it just P over RT?

LeAirraBullingor2k

It will be Chemical Equilibrium and Acids and Bases

LeAirraBullingor2k

I need some help figuring out how to complete ice tables. How do we know to use -X or X?

LeAirraBullingor2k

Since we just finished Acids and Bases I think you should still be able to use it but you should probably do a couple from the new section.

LeAirraBullingor2k

Thank you !

LeAirraBullingor2k

Is it okay to do a few problems from equilibrium constants for next weeks homework?

LeAirraBullingor2k

What does the n stand for in nRT?

LeAirraBullingor2k

Can anyone offer any studying tips for test 1 that has work for 14A?

LeAirraBullingor2k

Is Kp only used when dealing with gases?

LeAirraBullingor2k

We aren't expected to memorize K values, I'm sure they will be given.

LeAirraBullingor2k

Do homework problems, make flashcards for the common ligand names, and try to do UA session worksheets

LeAirraBullingor2k

In part e, 13.6 mg of NaOH is dissolved in .350 L and we have to find the ph and pOH. Can anyone explain their process on this problem?

LeAirraBullingor2k

Can we use 9C problems for our week 9 homework? I can't remember if we were still doing naming that week.

LeAirraBullingor2k

Why is SO3 an acid when the structure is nonpolar?

LeAirraBullingor2k

What makes a molecule an oxoacid?

LeAirraBullingor2k

Hydrogen bonding occurs between Hydrogens that are connected to Nitrogen, Oxygen, and Fluorine

LeAirraBullingor2k

Has anyone found an easy way to remember how to name molecules?

LeAirraBullingor2k

In lecture, did Lavelle say that acids are stronger or weaker when they have resonance?

LeAirraBullingor2k

Would it be enough for us to know the common strong/weak acids and bases for the final?

LeAirraBullingor2k

When determining whether a molecule will be an acid or a base in water, do we draw the structure out to help us figure it out? Or do we just have to be familiar with common acids and bases to know the answer?

LeAirraBullingor2k

So im assuming that if he did, it would be obvious ones that wouldn't require the chart to figure out.

LeAirraBullingor2k

Make sure to check the valence electrons and remember that the atom that is more electronegative will hold more electrons.

LeAirraBullingor2k

Do you think we'll be tested on this since our formula sheet doesn't include an electronegativity chart?

LeAirraBullingor2k

That should be fine!

LeAirraBullingor2k

Has anyone found a practice final exam with answers they could share?

LeAirraBullingor2k

Does anyone know when we get our grades back for this test? Also, did he mention when he was going to stop going over new content before the final? Friday seems a little too late to learn new stuff before the Sunday final.

LeAirraBullingor2k

Does anyone have any worksheets on this topic or any topic in quantum that I can use to review?

LeAirraBullingor2k

Is it safe to assume that all molecules with lone pairs will be polar?

LeAirraBullingor2k

Thank you so much for this! I'm definitely going to use this method.

LeAirraBullingor2k

I'm sure this will be included in the test since that entire section (2E) is on the syllabus.

LeAirraBullingor2k

Hello, an example in the book explains that a molecule is nonpolar because "the symmetry allows all three dipoles to cancel" but I'm not seeing how this symmetry concept applies to other molecules. Can anyone provide another way to tell if a molecule is nonpolar?

LeAirraBullingor2k

Nevermind, I just realized it because of the two lone pairs!

LeAirraBullingor2k

In 2E.3B in the book it asks for the shape and electron arrangement for ClO₂^-. I understand that the shape is angular but how is the electron arrangement tetrahedral when there are only 3 elements in this molecule.

LeAirraBullingor2k

My counselor recommended that I take Chem 14B and 14BL afterwards so that I won't be confused with the content from the lab. Basically, 14B will prepare you for the lab.

LeAirraBullingor2k

Ionic bonds are stronger than covalent bonds because in covalent bonds, the electrons are shared so it has a lower electronegativity. Highly charged ions will have stronger bonds than ions with small charges.

LeAirraBullingor2k

Why does Oxygen have a lower ionization energy than Nitrogen?

LeAirraBullingor2k

How would you find the first two quantum numbers of the last electron in an element?

LeAirraBullingor2k

I was wondering if the most stable Lewis structure for NO₂^- would be the one with the negative charge on Nitrogen or a negative charge on Oxygen?

LeAirraBullingor2k

As the length of a bond decreases, the strength of the bond increases.

LeAirraBullingor2k

Yes my TA recommended that we show important work so that if we make a mistake along the way, he'd be able to see if the wrong answer came from us simply not knowing the correct steps or if we just made a mistake but were headd in the right direction.

LeAirraBullingor2k

The most favorable lewis structures will be the ones with the least formal charge or formal charges that add up to zero. I'm not sure if we would be asked to draw all of them but you can draw a resonance hybrid to show the different arrangements of electrons.

LeAirraBullingor2k

All three of those atoms essentially copy the orientation of Argon as they have gained electrons in order to satisfy the octet rule. However, since they have gained electrons but keep the same number of protons, the positive charge is spread out more over the atom with each additional negative char...

LeAirraBullingor2k

Hello, I understand that the trend of ionic radius increases as you move to the left and down a column but I'm not understanding how to order ions with different charges. For example, S 2- , Cl - , P 3- . If they were neutrally charged, it would be Cl, S, and P in order of increasing ionic radius bu...

LeAirraBullingor2k

They cannot have a formal charge of zero because they are no longer neutral when gaining or losing electrons.

LeAirraBullingor2k

I don't think we have to know how to calculate bond lengths since this was never mentioned. It just seems like he just wants us to know that double bonds are shorter than single ones.

LeAirraBullingor2k

My TA confirmed that we can do homework problems from both sections this week.

LeAirraBullingor2k

In bonds like SF₅^-, why would it be better to have the remaining two electrons on S rather than creating a double bond between one of the Fluorines? Either way, you aren't really getting the formal charge so I'm a little confused.

LeAirraBullingor2k

Can anyone recommend an additional online practice that has worked for you? Sometimes I cannot make it to the step-up programs so I would like something I can do myself. For example, websites like Khan Academy.

LeAirraBullingor2k

To figure out how many significant figures you should use, look for the number in the problem with the least amount of significant figures.

LeAirraBullingor2k

Definitely attend the step up sessions and apply to get a PLF in Campbell Hall to get extra help during the week.

LeAirraBullingor2k

Would a 6-d subshell be the same as having a principal quantum number of 6?

LeAirraBullingor2k

Can anyone give me tips on studying and preparing for the week? I'm still trying to figure the best routine to learn and review the different topics each week. Thank you in advance.

LeAirraBullingor2k

Thank you so much for your advice! Would you recommend taking 14B and 14BL at the same time? or should I save my labs for the summer?

LeAirraBullingor2k

What eases my anxiety is going through practice problems multiple times to ensure that I fully understand each step and concept. It also helps to take 10-minute study breaks in between to make sure you are not overwhelming yourself with tons of information from the quarter. Finally, a good thing to ...

LeAirraBullingor2k

Thank you so much!

LeAirraBullingor2k

I don't know if someone has asked this already but would we get partial credit for unfinished problems headed in the right direction?

LeAirraBullingor2k

Why is it that when the energy of an electron changes to a lower energy, the difference in energy is given off as a photon?

LeAirraBullingor2k

Same with me, I haven't taken chemistry since the 10th grade and I'm a sophomore. What has been helping me a lot is doing every homework problem and also enrolling in AAP peer learning. These peer learning facilitators really know what they're doing and have helped me in other series too!

LeAirraBullingor2k

In which cases would it be based on charge and when would it just be based on the order?

LeAirraBullingor2k

During lecture, Dr.Lavelle mentioned side reactions and how they will change the yield, will the lost product amount be given or is this just something. we estimate?

LeAirraBullingor2k

How do you figure out if bonded elements are aqueous, solid or gas? People seem to know very quickly so I'm wondering if there's an easy way to know.

LeAirraBullingor2k

I think it would be in your best interest to show work. I believe the TA's won't take off points since the homework problems are a point each but it'll help you remember more.

LeAirraBullingor2k

On questions like problem H3 on the homework this week, I was wondering if there was a specific order we should write our equations in? For example, would it matter if it was SiH₄ or H₄Si. It's been a minute since I've taken a chemistry class so I cant remember.

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