CHEMISTRY COMMUNITY

Helena Hu 3E

If you click on the hint part of a question on Sapling, it will link you to a list of strong acids and bases which I find to be really helpful when memorizing them. Also, like Owen said, anything that is not listed on the strong acids or strong bases chart but follows the general formula are most li...

Helena Hu 3E

Adding on to this, pKa is equal to what pH is needed for a chemical species to be able to donate or accept a proton. Hope this helps!

Helena Hu 3E

I wouldn't bother memorizing the ones that haven't been seen on HW or in a lecture, but regardless, memorizing them will help you answer questions quicker on the exam. Good luck!

Helena Hu 3E

In the bottom left corner you should see updates like "typesetting math..." etc. Usually reloading the page works for me; it just takes a while for it to load. If not, I would try using a different browser. or closing your window and opening it again. Hope this works!

Helena Hu 3E

Does anyone know if the sections are the same? If two TAs are both reviewing the same topic will it be the same practice?

Helena Hu 3E

Is this something common that we will need to know going forward? I always get so confused when I see it come up.

Helena Hu 3E

Thanks for asking, Sid. It's always important to ask everyone how they really are; it is so often too easy to glaze over the question by saying we're doing just fine. Personally, I am excited for the holiday season and looking forward to finishing up the quarter strong!

Helena Hu 3E

Dr. Lavelle has also said in his emails that he will also go over some commonly missed questions from both midterms in the review lecture.

Helena Hu 3E

Will it be the same TA discussion link that we used for the last midterm?

Helena Hu 3E

I plan on going over the Sapling HW from the previous weeks as well as attending a bunch of the review sections. I think it would be best to try to start studying for the final this week so you know which topics you are weakest with so you can focus on those sections next week.

Helena Hu 3E

I wouldn't want to worry about it too much. MT1 was really tough for me since it was my first ever college exam, and I didn't do as well as I had hoped. But, I let it go since there is nothing I can do about it now, and focused all of my energy on MT2, which I do feel better about. Hopefully this wi...

Helena Hu 3E

Learning the names for geometry is definitely the most difficult thing for me in this class so far. There are a lot of great charts online but I'm never really sure if the one that I'm looking at includes everything that we need to know, plus you will not have access to a chart on the exam. What I w...

Helena Hu 3E

Kind of off topic, but touching on the type of bond (single, double, triple bond), the more bonds, the shorter the bond length and thus it is more difficult to break.
A single bond is easier to break and has a longer bond length than a triple bond.

Helena Hu 3E

Thanks everyone for the suggestions! Living in California is such a blessing right now because it's still relatively warm outside to go for a run. I also really enjoy playing tennis -- it's a great workout for your mind and body :)

Helena Hu 3E

Will week 10 be review then?

Helena Hu 3E

The textbook problems are super great to study from -- there are quite a few calculations in this course, and so for those I would do practice questions. For conceptual questions, reviewing the textbook and answering the learning goals on the question sheets.

Helena Hu 3E

Just remember that you tried your best! Even if you did not do as well as you expected, take this as a learning experience and use this to fuel your motivation for the final!

Helena Hu 3E

I think from now on we will be using our discussion Zoom links instead of a separate one made for the midterm?

Helena Hu 3E

I hope it will be next week before Thanksgiving. Hopefully with no issues it won't take too long :)

Helena Hu 3E

I try not to study the day of because I don't want to stress myself out. I just trust that I did my best with my studying, eat a good breakfast before, get a good nights sleep and believe that you can do it! Good luck!

Helena Hu 3E

Bond length also correlates to bond strength --> triple bonds are shorter and thus harder to break; single bonds are longer and easier to break.
A stick is harder to break when it is shorter vs when it is long. Hope this helps!

Helena Hu 3E

Do we need to know how to write the molecules given the name like these? I feel like this is a commonly asked question, because it's not on the list of things we need to know, but a lot of the textbook questions ask this.

Helena Hu 3E

I think like he did for MT1, he will send an email beforehand to let us know how many questions there will be on the exam. But yes, I do think there will be more questions. Good luck!

Helena Hu 3E

That makes so much sense! Thanks!! :)

Helena Hu 3E

I also did not take AP Chemistry in high school, but most of the fundamental and "review" topics were somewhat familiar to me-- I knew sig figs, empirical formulas, and such, but what is going to be covered on MT 2 is essentially all new information for me. You're not alone!

Helena Hu 3E

Hi everyone, I was wondering if someone could help me out with this question from the textbook: Write the subshell notation (3d, for instance) and the number of orbitals having the following quantum numbers: (a) n=5,l=2; (b) n=1,l=0; (c) n=6,l=3; (d) n=2,l=1 I understand how to write the subshell no...

Helena Hu 3E

I think we are limited to single, double, and triple bonds-- I don't exactly know why, so I am probably wrong. I haven't really seen any situation where a resonance structure has a quadruple bonds. I am also curious about this question, so I really hope someone or one of the mods can answer this.

Helena Hu 3E

You only need 1 double bond from a carbon to oxygen, and in turn you must add another lone pair. Additionally, your negative charge should be on 2 different oxygens -- I think you might have accidentally put your charge on a carbon.
Hope this helps!

Helena Hu 3E

I would just memorize the exceptions --> hydrogen is pretty easy to get since it is one of the most common elements, but take time to know the ones that do not follow the rule. It'll come naturally with a lot of practice. For the most part, elements need to satisfy the octet rule.
Hope this helps!

Helena Hu 3E

I don't think it is a different grading scale, just that there are points assigned to assignments and then however percent you achieve correlates to your grade. It still is one a 0-100 scale, if this is making sense. But like how Hannah said, this is not uncommon for university-level courses. Does a...

Helena Hu 3E

What helps me remember is that like anyone else said, the number at the top of the column shows how many valence electrons there are. However, skipping the transition metals, just remember the number of valence electron is the second number in the column, starting with column 13. For example, an ele...

Helena Hu 3E

I think it's really important to spend time away from the screen and to rest your eyes, especially now with all these online classes. I usually like to take a nap and play with my dog. I also think stretching is very necessary because it helps ease the tension in your muscles and prevent you from ha...

Helena Hu 3E

I feel like this is just one of those things you have to memorize, just like unit conversions. This is a bit harder because there are no prefixes that give away the information. But, something that helps me remember some parts of the electromagnetic spectrum is that visible light is yellow, like a l...

Helena Hu 3E

I think with the questions that we're asked in this course, the rounding should be pretty clear if all the steps were right. With the practice we've had so far with the Sapling hw and the textbook questions, most of the decimals came out to be values like .98 or .002 (things that make it clear where...

Helena Hu 3E

Generally speaking, your answer should always follow SI units (meters, grams, etc.) unless it is specified to be converted to other units. Even then, you should be converting anything that is not the correct SI units, and then converting to the specified units (Angstrom, kg, nm, etc.) at the very en...

Helena Hu 3E

Like Simran said, he called it 11+1 questions in his email, but you can still get partial credit for incorrect answers.
Good luck!

Helena Hu 3E

For me, I write out some of the essential information from the problem, which really means writing down the numbers and what they represent (ex. if the wavelength is given, I'll write lamba=number). After this, I'll write down the equations that I know are involved with these variables and see what ...

Helena Hu 3E

How would there be opportunity for partial credit if it is multiple choice? From what I understand if there's for example parts A and B, you don't need to do part A first in order to do part B, which helps you get as many points as possible. Adding on to this, I believe if hypothetically, if you we...

Helena Hu 3E

While we're on this topic, can someone explain what an Angstrom is and how to convert to it from meters?

Helena Hu 3E

I believe based on what the email from today meant, we should be allowed to have scratch paper outside of the equations sheet and the periodic table. However, we will be required to show the TA the front and back side of the paper to confirm that it is blank. Ultimately it is probably up to you TA, ...

Helena Hu 3E

Like what everyone else said, it is a constant value of 9.109x10^-31. This constant is also listed on Dr. Lavelle's Constants and Equations sheet. You can find this on the Chem14A website. Hope this helps!

Helena Hu 3E

Like what the moderator said, I don't think you will need to know them as this class is about application, not memorization. However, if you are really curious, there was a great past thread where people showed what acronyms they used to help memorize them. There is a great explanation there on how ...

Helena Hu 3E

I really recommend using the calculator option that allows you to manipulate your previous answer: I have a TI 84 calculator, and using this i do [2nd --> answer (above negative sign]), This allows you to add, subtract, multiply, divide, etc. by these long decimals so that you have the precise answe...

Helena Hu 3E

Mari Williams 2k wrote:Do electrons release energy when they are exited and jump energy levels, or when they fall to lower levels?

Electrons release energy when they fall to to lower levels (a photon of electromagnetic energy is released) . When electrons absorb energy, they jump to higher levels.

Helena Hu 3E

I would think that a greater amplitude of a light wave would mean higher intensity, as well. Hope this helps!

Helena Hu 3E

hi! To find out if the empirical is the same as the molecular, the molar mass will be provided. Then, you want to find the mass of the empirical formula --> if this is the same value as the molar mass, then you know the empirical and molecular formulas are the same. If not, you will need to multiply...

Helena Hu 3E

^^ woah.. I've never heard of that one but it seems a lot better than the one I used to use. Thanks!
The one I've always been taught it
King Henry Died Unusually Drinking Chocolate Milk
K- kilo
H- hecto
D- deca
U- unit (meter, liter, gram, etc.)
D- deci
C- centi
M- milli

Helena Hu 3E

Similarly to Hannah, I make a list on the reactants side and on the products side-- this helps me the most of keeping track of the numbers. I like to rewrite the equation and leave space at the front of each molecule so that I can fill in the stoichiometric coefficients with a different color. Then,...

Helena Hu 3E

Hi! For me personally, I have found that practice is really important, since what we have learned so far these are concepts you must understand rather than facts to memorize. I definitely intend on doing all of the textbook questions. I definitely think it is important that if you get a practice que...

Helena Hu 3E

I personally prefer method #1 because it helps me to better visualize which reactant is in excess. This is my first time learning limiting reactants, and so it might just work better for me since it is how I have been practicing-- I don't think it matters which one you choose as long as you show you...

Helena Hu 3E

I don't know if I am understanding your question-- are you asking why molecules do not break apart when they are dissolved in aqueous solutions? ex. table salt (NaCl) being dissolved in water? The answer to this example is that water molecules interact with Na to pull the NaCl ions apart. I don't kn...

Helena Hu 3E

That makes so much sense-- thanks!! :)

Helena Hu 3E

Hi everyone, I am a bit confused on how to go about solving this problem: Caproic acid has the odor of goats. (In fact, Capra is the genus of the domestic goat.) The compound contains only C,H, and O and was experimentally found to have a molar mass of 110±10 g/mol. When a 1.000 g sample of caproic ...

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