CHEMISTRY COMMUNITY

Evonne Hsu 1J

Can someone please explain the step-by-step process of this question? Thank you!

Evonne Hsu 1J

Can someone please explain the step-by-step process of this question? Thank you!

Evonne Hsu 1J

Can someone please explain the step-by-step process of this question? Thank you!

Evonne Hsu 1J

Can someone please explain the step-by-step process of this question? Thank you!

Evonne Hsu 1J

Can someone please explain the step-by-step process of this question? Thank you!

Evonne Hsu 1J

Can someone please explain the step-by-step process of this question? Thank you!

Evonne Hsu 1J

Can someone please explain the step-by-step process of this question? Thank you!

Evonne Hsu 1J

Can someone please explain the step-by-step process for this question? Thank you!

Evonne Hsu 1J

Can someone please explain the step-by-step process for this question? Thank you!

Evonne Hsu 1J

Can someone please explain the step-by-step process for this question? Thank you!

Evonne Hsu 1J

Why do we have to take the reciprocal of the Kc/Kp when using the reverse reactions?

Evonne Hsu 1J

Can someone please explain the step-by-step process for this question? Thank you!

Evonne Hsu 1J

Can someone please explain the step-by-step process for this question? Especially for the last 2 equations, thank you!

Evonne Hsu 1J

I think you are correct that it is sp3. As has 5 valence electrons and F has 7. So 5+7x3= 26 electrons. In general, you can think of having a central atom and know that you only need to pair three atoms around it for this problem because there are only 3 Fs. So knowing that the valence for each F w...

Evonne Hsu 1J

Why is the hybridization of AsF³ sp³d² ? I thought it should be sp³ only. Can someone please explain in detail because it's really confusing me. Thank you!

IGNORE ME I COPIED THE QUESTION INCORRECTLY! SORRY FOR THE CONFUSION ^^

Evonne Hsu 1J

The dipoles for this particular Lewis Structure of the compound do not cancel out, therefore this compound would be considered polar. A reminder is that you should always draw out the lewis structure before determining its polarity unless you are extremely familiar with the structure of the compound.

Evonne Hsu 1J

I believe viscosity means how easily a liquid flows. A liquid will be thicker and not flow as quickly when intermolecular bonds are stronger. When a liquid has a high viscosity (flow more slowly), it means there is a lot of friction in the liquid.

Evonne Hsu 1J

Stronger IMFs will definitely result in higher melting and boiling points. The boiling point is defined by a compound changing from liquid to gas phase while the melting point is a compound changing from the solid to liquid phase.

Evonne Hsu 1J

I believe the final will definitely test us on concepts and questions in regards to pH, pOH, [H+],[OH-], etc. Doing the textbook questions will definitely benefit you as well.

Evonne Hsu 1J

I believe ligands are compounds that are bonded to the transition metal, which forms a coordination compound.

Evonne Hsu 1J

Can someone please explain the according steps to this question? Thank you!

Evonne Hsu 1J

Can someone please explain the according steps to this question? Thank you!

Evonne Hsu 1J

Can someone please explain the according steps to this question? Thank you!

Evonne Hsu 1J

Can someone please explain the according steps to this question? Thank you!

Evonne Hsu 1J

What is the difference between pH, pKa, and Ka? And how do you use the values of each to determine whether an acid is neutral or negatively charged?

Evonne Hsu 1J

Yes, you do count the number of bonds for number of ligands. This means double bonds as 2 bonds and triple bonds as 3 bonds, etc.

Evonne Hsu 1J

I don't believe naming was in this week's lecture, but it might appear in the following weeks. I would say not to worry too much about it, since Dr.Lavelle would probably provide us with formulas and chemical names on the final exam.

Evonne Hsu 1J

Cl atoms need to be on the same side (cis) instead of the opposite side (cis) because they need to be displaced by C-G in the DNA in order to stop cancer cell replication. This process would also eliminate some healthy cells, but after all cancerous cells replicate at a much higher rate than healthy...

Evonne Hsu 1J

Cobalt had a charge of 2+ because the whole molecule has a neutral charge. In order to balance out the 2 Cl atoms each with a -1 charge, the Co atom must have a 2+ charge.

Evonne Hsu 1J

I believe it is a bidentate ligand since two Cl are shared with the transition metal, and ligands are anything that is bonded to the transition metal as well.

Evonne Hsu 1J

When determining the hybridization of molecules, do we take into account lone pairs or double and triple bonds? I'm still very confused about determining hybridization.

Evonne Hsu 1J

Can someone please explain when and where ligands appear?

Evonne Hsu 1J

How do you determine when you have Ion-Ion/Ion-Dipole/Dipole-Dipole/Dipole-Induced Dipole/Hydrogen-Bonding/London Dispersions in certain atoms or molecules? I'm especially confused about the attractive forces related to dipoles. How do you differentiate between the 3 dipole forces (Ion-Dipole/Dipole...

Evonne Hsu 1J

How does the polarizability of atoms and molecules affect their state (solid/liquid/gas) at room temperature and how is the boiling point and melting points related as well?

Evonne Hsu 1J

What is the general rule in the trend of polarizability in cations and anions? How are they different? Also, what do electronegativity and electron affinity have to do with polarizability in molecules?

Evonne Hsu 1J

I'm sure Dr.Lavelle has gone over this in one of his lectures, but I'm still confused about when to use a single/double/triple bond and when to just leave it as a lone pair. I realize that there are thousands of compounds with a lot of exceptions but what is the general rule to look out for when dra...

Evonne Hsu 1J

Can someone please explain the ways of determining Lewis structures in this question?

Evonne Hsu 1J

Can someone please explain this question about Lewis Structures and oxidation numbers? Thank you!

Evonne Hsu 1J

Can someone please explain this question about Lewis Structures and bond length, and also the question below about oxidation numbers? Thank you!

Evonne Hsu 1J

Can someone please explain this question about formal charges and resonance structures? Thank you!

Evonne Hsu 1J

Can someone please explain this question about the bond length and character contributing to the overall molecule structure? Thank you!

Evonne Hsu 1J

Can someone please explain this question about bond length statements?

Evonne Hsu 1J

Can someone please explain this question in regard to the resonance structures of the carbonate ion? Thank you!

Evonne Hsu 1J

Can someone please explain how to draw the resonance structures for the carbonate ion? Thank you!

Evonne Hsu 1J

Yes! There are a lot of exceptions for atoms that do not have an octet, as discussed in Lavelle's lectures. For example, N, S, Be, etc.

Evonne Hsu 1J

I think on the syllabus it says all the points added up which includes chemistry community, sapling hw, midterm 1 & 2, and a final to a total of 500 pts (if I recall correctly).

Evonne Hsu 1J

I don't think he's posting any of the modules on his website anymore :( I also really enjoyed them

Evonne Hsu 1J

The syllabus includes course topics and grade distributions.

Evonne Hsu 1J

Do we need to know how to use Schrodinger's Equation on the upcoming midterm? Also, can someone please explain the theory behind Schrodinger's Equation and what it is used for? I'm a bit confused about it. Thank you!

Evonne Hsu 1J

Can someone please explain the answer to the order of the atomic radius? Thank you!

Evonne Hsu 1J

The music is intriguing and it always makes me look forward to the Chem lectures every week. Keep them going:):):)

Evonne Hsu 1J

I use my notes that were taken in the online modules (pre&post questions), during the lecture, during discussion sessions with TAs, homework q from textbook, sapling questions, and also questions discussed during step-up/UA/Lavelle's office hour sessions. You should be more than prepared by revi...

Evonne Hsu 1J

Can someone please explain the step by step process of doing this question? Thank you!

Evonne Hsu 1J

Can someone please explain the order of these elements and what electron affinity has to do with it? Thank you!

Evonne Hsu 1J

Can someone please explain the reasons behind why oxygen has a lower 1st ionization energy than both nitrogen and fluorine? Thank you!

Evonne Hsu 1J

Can someone please explain the answer to the order of the atomic radius? Thank you!

Evonne Hsu 1J

Can someone please explain the answer to the order of the atomic radius? Thank you!

Evonne Hsu 1J

Can someone please explain why this is the answer to this question?

Evonne Hsu 1J

Please explain the answer to this question. Thank you!

Evonne Hsu 1J

Can someone please explain how to do this question? Thank you!

Evonne Hsu 1J

Does n1 represent the initial e- level and n2 represent the final e- level or is it the other way around? Would the final answer still be the same If the numbers were mixed up?

Evonne Hsu 1J

Please explain the correct answer to this question. Thank you!

Evonne Hsu 1J

Please explain the correct answer to this question. Thank you!

Evonne Hsu 1J

Please state and explain the answer for question 23. Thank you!

Evonne Hsu 1J

Please state and explain the answer to question #15. Thank you!

Evonne Hsu 1J

A Formula Unit is basically the empirical formula of a compound. It is similar to units such as atoms and molecules. You also use Avogadro's number to solve this problem. Hope this helps!

Evonne Hsu 1J

Will there be any "Live" Zoom lectures throughout this quarter or will they all be pre-recorded? Correct me if I'm wrong: only office hours will be live with Dr. Lavelle.

Evonne Hsu 1J

Do we enter the exact number (including all the decimals) into the calculator when calculating within steps? Do write down our rounded number, by following the sig figs rules, in between the steps as well or do we only write the final answer as rounded?

Evonne Hsu 1J

I was wondering if unfamiliar content on the fundamental readings that were never discussed during lectures nor assigned as homework problems would appear on any quizzes, tests, or exams?

Evonne Hsu 1J

Can someone please explain the step-by-step process of solving the question below? Thank you so much! M19) Caffeine has a molar mass of 194 g/mol. When 0.376 g of caffeine was burned, 0.682 g of carbon dioxide, 0.174 g of water, and 0.110 g of nitrogen were formed. Determine the empirical and molec...

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