CHEMISTRY COMMUNITY

Cindy Adiwidjaja 1B

You use a comma for substances that are in the same phase and you use | for substances that are in different phases.

Cindy Adiwidjaja 1B

I am not so sure, however, I think that if you have 100 posts to your account, you should be good.

Cindy Adiwidjaja 1B

I know that the final will be online, however, will the final have an equation sheet attached to it or will we have to provide our own equation sheet?

Cindy Adiwidjaja 1B

congratulations!! this is such a big award and we are all so proud of you! can't wait for you to be a UA ????

Cindy Adiwidjaja 1B

I think that it will be given to us. Considering they were given on the midterm, I think that it will be provided.

Cindy Adiwidjaja 1B

I liked chemical equilibrium because it was so easy. However, conceptually, I found galvanic cells to be really cool. Did I know how to solve them? No. But did I think they were interesting? Yes.

Cindy Adiwidjaja 1B

After having taken the class, I can confirm that there is no curve. The amount of points you receive is the exact grade you get in the class. The only "curve" he does is gives you a C- if you get at least 250 points. I can second this and that getting a 250 points gives a C- Thank you for...

Cindy Adiwidjaja 1B

It must be such a hard time for Lavelle and the staff, since their entire course ending was cut off short. So I think, although we do have to wait a long time, it is best for us to wait and give Lavelle the appropriate amount of time to think of the best solution.

Cindy Adiwidjaja 1B

Thank you!

Cindy Adiwidjaja 1B

It can only change with temperatures.

Cindy Adiwidjaja 1B

How will the equilibrium composition of a reaction mixture change if a system is compressed / expanding.

Cindy Adiwidjaja 1B

I know that sometimes we need to use the quadratic formula to solve for concentrations, but, what do we do when we are faced with a cubic equation? How do we solve for that?

Cindy Adiwidjaja 1B

aww i love my UAs !! thank you for all your hard work :))))

Cindy Adiwidjaja 1B

Look out for Lyndon's study packets, they are very helpful and he usually has a big review session where he explains the answers. In my experience, they have helped a lot and are sometimes harder than the actual midterm/final, so they definitely prepare you well. Yes, Lyndon is such a great UA and ...

Cindy Adiwidjaja 1B

Delta G just means that the compound is in Standard Conditions. What this means is that it is at 1.0 atm, 25 degrees Celcius, and 1 Molarity.

Cindy Adiwidjaja 1B

Cindy Adiwidjaja 1B wrote:You can have any state of matter in a cell diagram. This was proven in class when Dr. Lavelle showed examples of cell diagrams that had (l), (aq), and (s).

Additionally, the different state of matters are separated by vertical lines in the written convention.

Ex) Cu(aq)|H2O(l)

Cindy Adiwidjaja 1B

You can have any state of matter in a cell diagram. This was proven in class when Dr. Lavelle showed examples of cell diagrams that had (l), (aq), and (s).

Cindy Adiwidjaja 1B

It is just standard convention that we travel from the anode to the cathode. When a cell is working spontaneously and naturally, then it will always travel from left to right.

Cindy Adiwidjaja 1B

"n" is the number of balanced electrons on both sides.

Cindy Adiwidjaja 1B

A concentration cell has the same substance in both the anode and cathode. The only difference is their concentration. A galvanic cell has two different substances.

Cindy Adiwidjaja 1B

Both delta E and delta U are used as notations for internal energy. You can interchange them

Cindy Adiwidjaja 1B

Whenever there is a ⁰ on anything (G, H, S), it means that that process is in Standard Conditions.

Cindy Adiwidjaja 1B

Khan Academy and The Organic Chemistry Tutor on Youtube are both really helpful to me.

Cindy Adiwidjaja 1B

It is the slowest

Cindy Adiwidjaja 1B

Will we always be given E for reduction? Is that just common convention or will there be a time when we get oxidation?

Cindy Adiwidjaja 1B

I know that sometimes we can manipulate the equation to get deltas, however, what specifically gets turned into delta?

Cindy Adiwidjaja 1B

After having taken the class, I can confirm that there is no curve. The amount of points you receive is the exact grade you get in the class. The only "curve" he does is gives you a C- if you get at least 250 points.

Cindy Adiwidjaja 1B

Although derivations of equations will not be on any tests, it is still important to understand them conceptually. So I would say just know it.

Cindy Adiwidjaja 1B

A couple of ways you can manipulate Gibbs Free Energy is by using these two equations:

G=-nFE
G=-RTlnQ

You can make them equal each other, take the standards of them, and even switch the Q to K.

Cindy Adiwidjaja 1B

I think it is easier to understand it conceptually rather than memorize the numbers. If E is positive, that means that the products are favored, which means that K is also positive.

Cindy Adiwidjaja 1B

I understand that we need to do homework covered in the outline we learned, however, is it ok if we do homework from other outlines we did in the past?

Cindy Adiwidjaja 1B

I understand that Dr. Lavelle suggests Sapling Learning as a resource, however how do we access it? Do we need to pay?

Cindy Adiwidjaja 1B

I know that E is given, however, why do we need to flip the sign when we are trying to use the E for oxidation?

Cindy Adiwidjaja 1B

The cell will continue to do work until it dies. So E has to be positive.

Cindy Adiwidjaja 1B

Historically, we always get out tests back in our discussion sections the following week. Therefore, expect to get yours during Week 10 Dis.

Cindy Adiwidjaja 1B

So since a majority of us took Chem 14A with Dr. Lavelle and had previous posts, when we finish all of our posts for this quarter, would it be ok if we have 100 posts (since 50 are from last quarter). Or do we need to delete our first 50 posts?

Cindy Adiwidjaja 1B

Do you guys know if the TAs made Test 2, because I felt like it was formatted much differently than the other tests.

Cindy Adiwidjaja 1B

I remember that Dr. Lavelle said that in class, we are only doing the derivations so we as students can understand what we are doing. However, the test will not be on your mathematical skills. So no derivations.

Cindy Adiwidjaja 1B

So far, we have only been exposed to questions that has this information given.

Cindy Adiwidjaja 1B

I do not think we learned this in Chem 14B (yet) so I was wondering if this is going to be on the Final

Cindy Adiwidjaja 1B

Do the TAs make the final or does Dr. Lavelle make the final?

Cindy Adiwidjaja 1B

VLi_2B wrote:
TimVintsDis4L wrote:I wouldn't be surprised if we get our tests back on Wednesday as the Ta's might have to work on the final so they get the tests over with first.

Do the TAs make our final or Dr. Lavelle?

This is a good question. I'm not too sure but would like to know

Cindy Adiwidjaja 1B

I think we mainly do the derivation so we can understand where the equation is coming from. In the event that you do not remember an equation, knowing the derivation is good so you can create the equation for yourself.

Cindy Adiwidjaja 1B

Does anyone know when we will be getting our grades for Test 2? Will it be next week wednesday?

Cindy Adiwidjaja 1B

Thank you so much! Are you a TA or UA? If so, can we know who you are so we can attend your sessions, because these notes are very helpful!

Cindy Adiwidjaja 1B

When dealing with gases, we assume that we have to use Kp since gases have pressure. When dealing with aqueous solutions, we assume that we use Kc since aqueous solutions have concentrations.

Cindy Adiwidjaja 1B

We do not include solids and liquids when we calculate K because they stay constant and will ultimately have no effect on K. If you did want to include it, then you would still be essentially adding it to the top (products) and bottom (reactants) and they would still divide out to be 1.

Cindy Adiwidjaja 1B

Yay we all finished 14A and are now in 14B woohoo! I know that again for this quarter, we must post 5 posts every week, however, I realized that our accounts for Chemistry Community are linked with our UIDs, and that this is the same account we had for last quarter too. What this means is that our a...

Cindy Adiwidjaja 1B

So I know that for K, pure substances like solids and liquids do not change and therefore are not calculated into the K equilibrium. However, for the reaction quotient, Q, do we also not include these in our calculations?

Cindy Adiwidjaja 1B

Yes, it depends on the TA. Some check every week while others check at the end of the quarter. Honestly, since the TAs have so many students, I am pretty sure they just check to see if you have 50 at the end of the quarter. So, in the event that you do not, just make sure you reach 50 by tonight.

Cindy Adiwidjaja 1B

I just wanted to say thank you to everyone I have met in Chem 14A. It has truly been a roller coaster and I am so glad that it is finally done! I have met some incredible people in Chem 14A and I hope to see all of you again in Chem 14B. Thank you so much to all the TAs, UAs, and Dr. Lavelle. This h...

Cindy Adiwidjaja 1B

Does that mean that people who got Fs and Ds will have the exact same grade as people who actually got C-s. Or will the people who got C-s have slightly higher grades?

Cindy Adiwidjaja 1B

I honestly find listening to calming music to be really helpful. Listen to some slow and calming music while you study so you do not feel overwhelemd.

Cindy Adiwidjaja 1B

No, this is a type of intermolecular force. Not an acid and base reaction

Cindy Adiwidjaja 1B

I know that there are strong acids and strong bases, but what does it actually mean?

Cindy Adiwidjaja 1B

The other conjugate bases are not as strong, meaning they can not produce the same outcome as H-F can.

Cindy Adiwidjaja 1B

I saw from previous years' posts that Lavelle also adds 10 points to every one's score out of 500. I do not know if this is still true, but this popped up a lot in Chemistry Community.

Cindy Adiwidjaja 1B

Yes, Dr. Lavelle sent out an email saying that we will have class and discussion sections on wednesday.

Cindy Adiwidjaja 1B

Because half of the students will not have discussion this week, I believe the staff said we will get our test 2 back in week 10

Cindy Adiwidjaja 1B

The final is cumulative, meaning it will cover everything since Week 1, including things we have already been tested on.

Cindy Adiwidjaja 1B

Coming from an underfunded and underprivileged high school, my only experience with Chemistry was during sophomore year, and was extremely unhelpful in terms of how it relates to this current class. I am struggling a lot in Chem 14A, and because the topics covered seems to by review for every one el...

Cindy Adiwidjaja 1B

Lewis Acids and Bases involve ELECTRON transfers, while Bronsted Acids and Bases involve PROTONS.

Cindy Adiwidjaja 1B

In terms of the grading, I don't know if we are getting graded on a week to week basis, or at the end of the quarter. Some people say that if we have 50 by the end of the quarter we get all the points, but others say that we need to do 5 a week or else we do not get the points. If anyone knows the a...

Cindy Adiwidjaja 1B

On Chemistry Community, every time you post something, you should see a number on the side of your name for your post. This number tells you how many posts you have made.

Cindy Adiwidjaja 1B

So I understand that Lavelle said that the homework for week 9 can be turned in during week 10 because of Thanksgiving break, however, if we have section this week that is not cancelled due to thanksgiving break, do we still turn in our homework?

Cindy Adiwidjaja 1B

Oh ok I see, thank you for helping!

Cindy Adiwidjaja 1B

Yea I suppose you guys are right because the Video Modules were also very old. He probably does not have any other videos of his lessons.

Cindy Adiwidjaja 1B

Yea I was confused because sometimes the dates for my posts are extremely off, saying that I posted in June of something, so I was unsure if the dates and 5 per week will still be taken into account even if the weeks are incorrect.

Cindy Adiwidjaja 1B

I heard that the TAs that already had section this week gave back test 2, but I am not quite sure. And in terms of the final, it will cover everything, even midterm stuff.

Cindy Adiwidjaja 1B

Another way to think of it is to envision the electrons in the whole lewis structure, not in a singular atom. By looking it at a bigger picture, it will help.

Cindy Adiwidjaja 1B

Additionally, which nomenclatures should we already know? Its been a while since I took high school Chemistry, and I do not remember any chemical compounds other than water and carbon dioxide/monoxide. What others do we need to know?

Cindy Adiwidjaja 1B

The video modules that Lavelle posts on his website are extremely helpful, but does anyone know if he will post a video module for every topic we go over? So far, only the early Quantum unit is on his website, however, will there ever be any more?

Cindy Adiwidjaja 1B

I know that we need to submit 5 questions per week, however, is this checked on a weekly basis, or can we just end the quarter off with 50 posts, regardless of when they were posted. I know some people who do not do 5 a week, but are doing it at random times. By the end of the quarter, if we meet th...

Cindy Adiwidjaja 1B

Kayla Maldonado 1A wrote:How can you tell if a compound has resonance and do all resonance forms need to be drawn when being asked for a lewis dot diagram?

To my knowledge, any structure with non-single bonds has resonance. In terms of depicting it, I think everyone else who replied is right.

Cindy Adiwidjaja 1B

Dr. Lavelle said that we do not need to worry about orbital shape for any test we encounter.

Cindy Adiwidjaja 1B

To my knowledge, I heard that the TAs have until Tuesday to finish grading all the Midterms, therefore, the earliest we can get them back is Wednesday

Cindy Adiwidjaja 1B

Whenever you post something, there is a box on the right side of your post that has your information on it. Next to your name, there should be a number. By clicking that number, you can see all your posts, questions and replies, and can easily access all of your old work.

Cindy Adiwidjaja 1B

With any Lewis Dot Structure, it is best to figure out which atoms have the lowest possible Formal Charge. By manipulating the dot structure and figuring out which combination has the lowest dot structure, you should be fine.

Cindy Adiwidjaja 1B

Although we were faced with both types of examples, Lavelle usually draws them out separately, as multiple different structures with different type of bond arrangements, so I think we should stick to that.

Cindy Adiwidjaja 1B

I understand that resonance is when a bond is a hybrid of a single and double, for example. However, I thought that the word "resonance" only applied when describing the bond type. Sometimes in class, Lavelle talks about Resonance "Structures". What is that exactly, if it is not ...

Cindy Adiwidjaja 1B

All bond lengths we have been exposed to were given to us in the problem. Dr. Lavelle stated that these lengths were found through experimental data calculations and that we were specifically not going to get too in depth into that.

Cindy Adiwidjaja 1B

When dealing with elements in the s and p blocks, just count the elements from left to right, SKIPPING the d block, until you get to your desired element. For example, for Oxygen, the elements in that row are Li, Be, B, C, N, O, F, Ne. In that order, Oxygen is the 6th element. Thus, Oxygen has 6 val...

Cindy Adiwidjaja 1B

In class, Dr. Lavelle said that in compounds with resonance, all bonds are really just a mix of different double and single bonds and that they are a hybrid of the two. In that case, how can we depict the most accurate bond type when drawing lewis structures?

Cindy Adiwidjaja 1B

Everyone here is correct with their answers, however I wanted to give a quick tip on how I remember the difference.

For Cation (positive charge), I just think of the "t" as a "+(plus sign)"

For Anion, I just think of the "n" as a "Negative"

Cindy Adiwidjaja 1B

For this week, are we supposed to do the homework based on the Quantum World, or based on the Ionic and Covalent Bonds?

Cindy Adiwidjaja 1B

I was going over the chapters in the textbook and I realized that Dr. Lavelle didn't go over some topics. Do we still need to know these or will only the content he introduces us in class be on the tests?

Cindy Adiwidjaja 1B

So does that mean that an electron would shift from spin up to spin down, since orbitals are basically circular?

Cindy Adiwidjaja 1B

So does this imply that in common everyday life, electrons are constantly jumping from energy levels and that the spectrum just depicts what specific regions this occurs?

Cindy Adiwidjaja 1B

So in class we constantly use multiple equations when solving a question, and sometimes we manipulate equations to help us solve. However, how do we know when we can manipulate them and combine them to solve our questions? De Broglie's Equation is the mixture of two different equations, so it seems ...

Cindy Adiwidjaja 1B

I was having a hard time understanding the electron spin. What does spin up and spin down in terms of the physical atom? What is actually happening?

Cindy Adiwidjaja 1B

When do we know that it is allowed to combine different equations? In class, we often times intermix E=hv, c=λv, E=pv, etc. Why are we allowed to intermix them and when do we know we need to?

Cindy Adiwidjaja 1B

So Professor Lavelle showed a graph in class of the light spectrum which had different lines going through it. He referred to some as the Balmer Series and Lyman Series. I was just confused on what that graph actually was and what the lines explained.

Cindy Adiwidjaja 1B

In terms of quantifying a wavelength as "measurable" or not, Professor Lavelle stated that anything with a wavelength of 10^-15 or higher should be considered while preforming calculations.

Cindy Adiwidjaja 1B

The equation spelled out is "energy = planck's constant x wavelenght", and since you want to find energy, this equation would be perfect, that is, if you are using it in the correct context.

Cindy Adiwidjaja 1B

Higher intensity implies larger amplitude/larger "bumps", whereas shorter wavelength implies closer "bumps".

Cindy Adiwidjaja 1B

It's ultimately up to you to chose which 5 you want to complete, however, diversifying your homework questions and choosing one from each section is a good way to practice the different Fundamentals.

Cindy Adiwidjaja 1B

While doing some of the homework, I noticed that the Solution Manual didn't follow the rules of Significant Figures and almost always used two decimal places for all the answers. I was just wondering if we needed to abide by the Solution Manual's numerical values or by the scientific Significant Fig...

Cindy Adiwidjaja 1B

You were correct in converting the moles into atoms. However, the next step is to convert the atoms into pm. Since it is stated in the question that the atoms are 144pm in radius, you know that they are 288pm in diameter (and it's easier to work with when it's in diameters). Since 1 atom of Ag is 28...

Cindy Adiwidjaja 1B

In the example problem given in class, is was discovered that the CaC2 limited the H2O. However, since the CaC2 is the limiting reactant and not allowing the water to reach its full potential, how come the products produced are not limited as well? If we have less of the CaC2, shouldn't both the oth...

Cindy Adiwidjaja 1B

What is a formula unit in terms of physical things? Is it just a general name for a general unit? Or does it represent something tangible? I know what an atom, molecule, and ion is, however I do not think I can conceptually wrap my head around what an actual formula unit is or what quantity it exact...

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