CHEMISTRY COMMUNITY

Mia Meza

Thank you! I wish you a safe and happy holidays

Mia Meza

also I am not sure if we need to memorize this but acid rain has a pH value around 4 (please correct me if I am wrong)

Mia Meza

there are pollutants in the air including SO2, NO3-, CO2 which are caused by coal power plants, etc. These pollutants react with water or oxygen and produce acid rain.

ex: SO2 + H2O---> H2SO3

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Also thank you, I will now write down my posts for each quarter lol so I can keep track.

Mia Meza

EllieSchmidtke_4I wrote:So we only have to have 50 posts total for the quarter to get full credit, not necessarily 5 per week?

Yup, we need 50 posts :)

Mia Meza

This relates to the resonance structures, if a bond is localized then it does not move but if it is delocalized the the electron can move depending on the resonance structure.

Mia Meza

so if you draw out the lewis structure you would see that N is in the middle and there are 3 hydrogens attached to N, as well as 1 lone pair. That means there are a total of 4 things surrounding N which explain the sp3 hybridization.... (s1p3 adds up to 4)

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Nina Ellefsen 1A wrote:Hi! If you wanted any further clarification on the topic, there are tons of youtube videos if you search 'double slit experiment' :) hope this helps!

Thank you!

Mia Meza

KA measures the strength of an acid whereas pKA is the negative log of that value. It's just an easier and more convenient way to refer to the KA value as far as I know. =) Does a higher Ka value represent a stronger acid or is it not that simple? Yup, the higher the Ka value the stronger the acid....

Mia Meza

I think about it as looking to see if there are two things both present: An availible H+ to be donated, and and overall negative charge. Yes^ on the hw problems the solution states you want to look for an H+ (this would be your acid) and a negative value (this would be your base). Hope this made se...

Mia Meza

I only remember Dr. Lavelle going over Cisplatin-- do we have to know others? I'm pretty sure the only one we'd have to know is cisplatin, and possibly why transplatin is its ineffective counterpart. I know for transplatin it is ineffective because of the geometry (correct me if I am wrong). Cispla...

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I know cisplatin is what Lavelle mentioned because Cl binds with Guanine to prevent the cancer cells from replicating.

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^ if you click that link it will show you a picture that can help explain what I mean :)

Mia Meza

from my understanding I know a compound will be amphoteric if it involves Be - Po.
[https://useruploads.socratic.org/um0XJzvvTZuLHnwyqgKj_Snap_024_.jpg]

Mia Meza

From what I read I classify amphoteric substances from Be to Po..... the picture above is a really good representation

Mia Meza

Also! I make sure I don't drink caffeine before my test because I am already amped up with nerves so I do not like to drink any energy drinks or coffee the day of my test.

Mia Meza

I also struggle with really bad anxiety to the point my hands will tremble and I will go blank on tests. I remind myself that I know the information and to just do the best with what I can remember, not to stay stuck on one problem because it takes away from the ones you actually know. Maybe write y...

Mia Meza

This is just a suggestion but I started taking vitamins that say they can help with stress levels, so maybe you can look into that? but taking a shower while listening to music before a test helps.

Mia Meza

I was stuck on this one as well but you want to look for an H ion and a negative charge :)

Mia Meza

I am wondering if we would do the same for problem 6B.4 which states: A careless laboratory technician prepares 300.0 mL of 0.0175 M KOH(aq) and pipets 25.0 mL of the solution into a beaker. The beaker is allowed to stand in a warm place for two days before use, during which time some of the water ...

Mia Meza

I am wondering if we would do the same for problem 6B.4 which states: A careless laboratory technician prepares 300.0 mL of 0.0175 M KOH(aq) and pipets 25.0 mL of the solution into a beaker. The beaker is allowed to stand in a warm place for two days before use, during which time some of the water e...

Mia Meza

I would maybe do the even textbook problems as a way to test yourself since we are assigned the odd problems.

Mia Meza

If anyone did 6B.2 I just want to double check if the answer is 1.28. Thank you!

Mia Meza

I saw someone say you can just take the -log(12/100) which does give you the same answer, but working it out helps me understand what is happening, but do what way works best for you :)

Mia Meza

I had trouble on this problem too but I figured it out. So we know that HCl is a strong acid..... according to the pH scale anything below 7 is an acid. Because HCl is a strong acid I am going to use 1 x 10^-3 (because 3 on the ph scale is acidic) Now to find the initial value we are going to do: ph...

Mia Meza

Could someone explain why CH3CHO shows london dispersion interactions.

Mia Meza

What does it mean when a question asks what resonance structure is the most plausible? I know it has to do something with having formal charges that are as close to 0 as they can be, but I'm still not sure. I had this same question. When I looked up the word it stated the most reasonable or believa...

Mia Meza

Hey! I had the same question.
- Lewis acids accept an electron while Lewis Bases donate an electron.
- What helped me understand more was watching a youtube video about lewis acids and bases. Seeing different examples really helped. I suggest the organic chem tutor.

Mia Meza

We haven't really learned how to calculate electronegativity but we do need to know the concept. What helps me is knowing that the left is more electronegative. The closer it is to F than I know it is more electronegative :)

Mia Meza

I am using my second pass to enroll into chem :)

Mia Meza

Controlling anxiety can be super hard for me, but it usually stems from negative thoughts and doubt. So, if I ever feel like I'm starting to doubt myself on a problem or if a feel like it's hard, I skip it and move on right away. I don't want that feeling of doubt to carry on into the rest of the t...

Mia Meza

I always make sure I start studying at least a few days in advance so I can prep until I feel like I'm ready/confident for the exam. What usually helps calm or reduce my anxiety is going through practice problems and making sure I know how to do all different types so if there's a similar question ...

Mia Meza

I get really bad test anxiety too :( I always try to make sure that I get a good night of rest the day before any exam. Right before I take a test I like to listen to upbeat music which makes me feel more prepared for it somehow lol. Be confident in what you know and remember to take deep breaths :...

Mia Meza

You're definitely not alone on this! I tend to have really bad test anxiety, but recently I have been getting better at suppressing it. Before the exam, I like to take breaks from studying every now and then to keep my mental health in check. I feel that this is super important, yet often overlooke...

Mia Meza

In one of the lectures it was said the 4s orbital comes before the 3d orbital. Then it was stated after the 4s orbital is full, the electron enters the 3d state and that the 3d state is lower in energy than 4s. Can someone clarify why 4s comes before 3d :)

Mia Meza

I was wondering the same, I would love to go back and rework the problems.

Mia Meza

I am not sure if anyone struggles with test anxiety... if you do, what are some techniques you guys use to deal and control test anxiety? Thank you.

Mia Meza

I want to better my study habits for the final? What are some studying methods that have helped you guys? What do you try to avoid?

Mia Meza

I am also unsure about this myself ^

Mia Meza

Grades are available! : )

Mia Meza

I am reviewing and am having a little trouble with this question. Practitioners of the branch of alternative medicine known as homeopathy claim that very dilute solutions of substances can have an effect. Is the claim plausible? To explore this question, suppose that you prepare a solution of a supp...

Mia Meza

When emitting energy, n1= final state and when absorbing energy, n1= initial state. I was having trouble with this too.

Mia Meza

oh yes! Thank you

Mia Meza

On the post assessment there was a question that stated "Calculate the uncertainty in position of an electron if its uncertainty in speed is one hundredth the speed of light". I am unsure how to tackle this problem, reading the question I thought we might multiply 1/100 x 2.998*10^8, but t...

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On the post assessment one of the questions asked "at what velocity is an electron moving if it has a wavelength of 7.0 x 10^1 m? I know the equation I am going to use is v=h/wm. and I am unsure what to use for the mass.

Mia Meza

I believe it would be 1 million because going back to Dr. Lavelle's lecture, there is one photon and one atom interaction and one electron ejected.

Mia Meza

I was a little confused when I saw this as well, but its just giving you a range of 90-110 for molar mass. You compare the molar mass of your empirical formula to the given mass to find your molecular formula.

Mia Meza

Watching the Photoelectric Effect Lecture, Dr. Lavelle was solving to find the longest wavelength possible if 3.61 x 10^-10 J were required to eject an electron that had zero kinetic energy. Dr. Lavelle used both the equations c=wv and E=hv (w is for wavelength) and came up with w=hc/e. I just wante...

Mia Meza

Can someone please explain what threshold energy is. How does it affect wavelength?

Mia Meza

The empirical and molecular formula can be the same, but in order to ensure that they are the same you have to check the molar mass of the empirical formula and make sure it is in the range of the molecular formula.

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