CHEMISTRY COMMUNITY

MichaelMoreno2G

What about if the reaction is not at equilibrium? How increasing the concentration affect the equilibrium?

MichaelMoreno2G

Yes, as others have stated, we can assume that A=1 unless it is otherwise stated in the problem.

MichaelMoreno2G

when given pKa and asked for ph, solve for Ka with pKa= -logKa which would mean 10^(-pKa)= Ka Then, if the reaction is acidic, find the Ka equilibrium equation for the reaction Usually, an initial Molarity will be given for the Reactant Once the Ka equation is written, set it equal to the Ka value ...

MichaelMoreno2G

For what type of questions would we apply the Nernst Equation?

MichaelMoreno2G

Can someone explain why we add m and n?

MichaelMoreno2G

How do you guys study for the final? I still haven't found a study method that works for me and I'm really trying to do my best for this final!

MichaelMoreno2G

The first order claims that If the concentration of a reactant remains constant, its concentration can be included in the rate constant. However, i am not too sure about the second order. If someone can clarify that order I would appreciate it.

MichaelMoreno2G

I'm still confused on why we apply rate laws to certain questions. Can someone explain what a rate law is and why it is useful?

MichaelMoreno2G

You would have to know the values of both, but usually K is given and you solve for Q.

MichaelMoreno2G

I'm not too sure but I believe H+ is included in a cell diagram, but I know for sure H20(l) is not included.

MichaelMoreno2G

As a follow up to your question, when and why do we add Pt(s) to the ends of a cell diagram?

MichaelMoreno2G

As mentioned above, Delta G would be less than zero because the reaction is spontaneous.

MichaelMoreno2G

What would be the final units for the equations? In other words, if we used moles, what would our final units be, and if we used m, what would our final units be? I get confused with the two.

MichaelMoreno2G

Up to what section of electrochemistry do we need to study? I'm still a little confused so if someone can clarify that would be greatly appreciated.

MichaelMoreno2G

According to Lavelle, the test will cover everything up to Friday's lecture.

MichaelMoreno2G

Spontaneity just means that a chemical process can happen without a major outside force acting on the chemical reaction. There are two outside forces, I believe they are enthalpy and entropy. If there are no major outside forces, as you say, then the only forces acting/producing the spontaneous rea...

MichaelMoreno2G

A pretty simple explanation of what delta G indicates is the change in free energy of the system. In an exergonic reaction free energy is released, hence delta g is negative. In an endergonic reaction, free energy is inputed into the system, and delta g is positive.

MichaelMoreno2G

As you said, Gibbs Free Energy is the maximum amount of non-expansion work that can occur in a closed system.non-expansion work is work not involving pressure and volume, as the person above stated: electrical work.

MichaelMoreno2G

Can someone please explain why 3E is false?

MichaelMoreno2G

will all of outline 4 be on the midterm? (including Gibbs Free Energy and the little part of Chapter 11 that is listed on the 6th edition outline) Or are will it be only up to section 9.11 in the sixth edition? I saw someone on another forum post that gibbs free energy will not be on the test, but ...

MichaelMoreno2G

ariana_apopei1K wrote:Lyndon is probably going to make one that he'll go over in his review session this monday

Do you know where and what time his review session will be?

MichaelMoreno2G

805132275 wrote:Are there any study guide/review sheets the TAs have made available for the midterm?

I know Joyce had a review session and she provided a worksheet that was very helpful. She said she was going to post it online, I just can't seem to find it.

MichaelMoreno2G

SydBenedict2H wrote:If its ever in bar, thats more or less equivalent to atm.

Exactly, I remember the professor saying the difference between bar and atm is very small.

MichaelMoreno2G

Katelyn Pham 4E wrote:This is correct. If work is done BY a system, energy is being released making it exothermic resulting in w being negative. If work is done ON a system, w is positive, because it is endothermic and energy is being put into the system.

Thank you for this summarization. It was very helpful.

MichaelMoreno2G

SydBenedict2H wrote:So does this mean we aren't going to have to use the integral formula to calculate anything on tests?

Most likely not, but I would still know it just in case.

MichaelMoreno2G

SydBenedict2H wrote:If they mention internal energy then they are referring to delta U and you should use its associated equations.

Is there a specific reason as to why we use the associated equations?

MichaelMoreno2G

Why is using the quadratic equation the only way to solve for a change in concentration?

MichaelMoreno2G

Can someone clarify what the significance of Q<K is and vice-versa?

MichaelMoreno2G

Was Wednesday's lecture the last new material we learned for the test?

MichaelMoreno2G

In response to the responses above me, why would solids and liquids not apply to the equilibrium constant?

MichaelMoreno2G

Personally, I believe equilibrium constants are important because they tell us how reversible a reaction is. For instance, if K>1, the reaction favors products. If K=1, there is an equal amount of products and reactants. If k<1, reactants are favored.

MichaelMoreno2G

To the comment above me, you said the inverse relationship between volume and pressure only applies to gases. How would it apply to liquids, solids or aqueous solutions?

MichaelMoreno2G

Thank you for this! The one for the midterm really helped out and I hope this one does too. What will be the final topic covered during the review session?

MichaelMoreno2G

Water is always monodendate because it can only form one dative bond with a metal ion due to the oxygen molecule, which is why it is not bidentate

MichaelMoreno2G

I feel like that would revolve around memorization, and usually Lavelle stresses the idea of understanding the concepts as opposed to memorization so I doubt it. But hey, you never know. I may be wrong.

MichaelMoreno2G

I believe Ammonia is one and also bicarbonate

MichaelMoreno2G

I've been asking myself the same thing. If someone can please clarify I would greatly appreciate it.

MichaelMoreno2G

I hope we only have to know sp3d2 but i'm not too sure if we have to know any other levels.

MichaelMoreno2G

Does anyone know the specific topics that will be on the test?

MichaelMoreno2G

Can someone explain the difference between bent and linear?

MichaelMoreno2G

Can someone explain how we identify if a bond is polar or non-polar?

MichaelMoreno2G

On a test would be asked to draw the resonance or hybrid structure?

MichaelMoreno2G

For the problems revolving lewis dot structures such as the one from the midterm, where you have to identify which element it is from the given structure, can someone explain how to find it? I was confused on that question.

MichaelMoreno2G

Does anyone know when our next test is? I remember someone telling me it would be this upcoming Friday but that seems so soon. If someone knows please let me know, thanks in advance.

MichaelMoreno2G

I'm not too sure but I believe that since the noble gases already have eight electrons, they don't wan't to attract any more electrons. Therefore because electronegativity measures the attraction between an atom and an electron, noble gases do not have electronegativity.

MichaelMoreno2G

Can someone explain why we use [Ar]

MichaelMoreno2G

Does anyone have the answer key or know if there even is an answer key for test one and two? I got some questions wrong and i want to see how they are properly done

MichaelMoreno2G

The review session on Saturday that went over this practice midterm really helped prepare me for the exam, thank you.

MichaelMoreno2G

I was also worried about this prior to the exam but thankfully we did not have to use it on the exam

MichaelMoreno2G

I also continue to get emails from a website called "OneClass" that tends to have study guides for previous midterms etc. I'm wondering if anyone has actually used the website. But on another note, Khan Academy really helped me as an extra source to study for test 2.

MichaelMoreno2G

I also had a similar question regarding this, if someone can please answer I would greatly appreciate you.

MichaelMoreno2G

Chem_Mod wrote:Here is the answer key for Week 2 Topics Step Up Worksheet!

Honestly, thank you so much for these. I feel like this is really good review for me as I tend to learn more from seeing how a problem is actually done. I look forward to attending one of your step up sessions.

MichaelMoreno2G

Although this is over a year old, I really appreciate seeing posts like this. You're right, this class can be overwhelming and it's barely about to be week 4. Although you may never see this, thank you for posting this. I needed this inspiration for the upcoming test.

MichaelMoreno2G

I wouldn't doubt it since it's in the outline. However, if there were to be a question regarding that section it shouldn't be too hard (I hope).

MichaelMoreno2G

Will your sessions be every Friday and Monday for the rest of the quarter? Or just for this week?

MichaelMoreno2G

Q: Do you know any organic chemistry jokes?
A: I know Alkynes

MichaelMoreno2G

To the reply above this, why don't larger objects have a wave-like properties that can be measured?

MichaelMoreno2G

Are your workshops on Sundays and Sundays only?

MichaelMoreno2G

Thanks for that explanation Tim. I was also confused on how to round using sig figs but I feel like your explanation actually helped. I'm just curious if we will lose points on tests/exams if we round to the incorrect decimal point.

MichaelMoreno2G

In an exam would we ever have to convert from mol to mmol or vice-versa?

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