CHEMISTRY COMMUNITY

Mizuno_Mikaela_1D

They give the same result as long as the temperature is at 298K. The second equation just multiplied all of the constants (assuming T is 298K) and also took into account the conversion from ln to log.

Mizuno_Mikaela_1D

Here are solutions. Another problem set will be posted shortly. Problem_Set_01_Conformations_Solutions_01.pdf Problem_Set_01_Conformations_Solutions_02.jpeg Have the solutions for drawing the chair conformations of problem set 1 conformations been posted? I can't figure out how to delete this post ...

Mizuno_Mikaela_1D

Is 1-(methylethoxy)-2-methylpropane another correct/acceptable way to write 2-isopropoxy-2-methylpropane?

Mizuno_Mikaela_1D

Is anyone (in the 8am Chem 14C lecture) currently enrolled in Discussion 1D (Tues 1-1:50pm) or Discussion 1J (Fri 9-9:50am) willing to switch with me? I have Discussion 1G (wed 2-2:50pm). Thanks!

Mizuno_Mikaela_1D

Julie Barreto 3A wrote:how would you draw out 2-butene or anything with a number in front of it ???

The 2 means the carbon carbon double bond starts at carbon 2 (between the second and third carbon) so it would be CH3-CH=CH-CH3.

Mizuno_Mikaela_1D

So first you see that the longest chain is the ring which has five carbons making it cyclopentane. Now looking at the substituents, on one of the carbons, you have two methyl groups and on another carbon you have an isopropyl group. There are two ways to number the carbons (counter clockwise or cloc...

Mizuno_Mikaela_1D

if there is a homogeneous or heterogeneous catalyst present in the slow reaction, does it show up in the overall rate law? Or would this just be considered zero order so the rate = k?

Mizuno_Mikaela_1D

Can someone explain why question 10 is false? I thought half-lives are always the same. I am also confused by this question. I know that the equation is second-order, but do not understand why the decomposition would take different amounts of time. Since it is second order, the equation for t 1/2 i...

Mizuno_Mikaela_1D

Is there a way to tell the number of elementary steps that will occur? Or could there be any number of steps as long as they add up to the overall reaction?

Mizuno_Mikaela_1D

I just read the part that says it was a poorly worded question in case students assumed constant volume.. But then in the Harry Potter question, when both volume and temperature were changed, I understand you can used Cv assuming the volume and temperature changed happened separately to calculate ch...

Mizuno_Mikaela_1D

When do you use Cv vs Cp if the question does not explicitly say which conditions it is under? For example in midterm 2013 Q3A, A blacksmith putting a 1.45kg carbon steel katana at 314.0 C into water at 25C. The steam does not heat past 100C. The q=mCdeltaT equation uses Cp for both the water and ka...

Mizuno_Mikaela_1D

If there is a solid transition metal in the half-redox reaction, then the electrode will be that metal. In the problem you were referring to, gold is a transition metal and since it was solid gold, it is able to be the electrode. However, If there is not a solid transition metal, the electrode will ...

Mizuno_Mikaela_1D

I just think how with reduction, the oxidation number is literally getting reduced. Clearly since the number is getting reduced, it is getting more negative thus you know it is gaining electrons. I like to think of it this way because it makes it easy when looking at redox reactions to determine wha...

Mizuno_Mikaela_1D

Just need some clarification... So a reversible reaction is always isothermal so does that mean that there has to be a change in volume and a change in pressure? As for irreversible, does this always have a change in temperature? Also, is it always isochoric AND isobaric or is it just one or the oth...

Mizuno_Mikaela_1D

I'm not entirely sure but I believe you would need more information to determine whether or not work was done on or by the system. A negative delta H just means that system is releasing heat into the surroundings. To determine the amount of work If you have delta H, one way to determine work done on...

Mizuno_Mikaela_1D

Will there be Peer Learning Sessions with the UA's tomorrow at Young Hall/Hedrick? Just wondering if they will be there since it's a holiday. Thank you!

Mizuno_Mikaela_1D

Path dependent means the value depends on not only the initial and final states but also the states in between. The example given in class about work was that if you are walking from one place to another and there are two different routes you can take, a longer route will require more work even thou...

Mizuno_Mikaela_1D

All of the office hours are extremely helpful! I would suggest going to as many as possible and also try to figure out which of the UA/TA's teaching styles are a good fit for you because they all hold their sessions a bit differently!

Mizuno_Mikaela_1D

So I was doing 12.81 and the answers said to ignore the second deprotonization when Ka2 is less than Ka1. Would there ever be a time when Ka2 is not smaller than Ka1 for weak polyprotic acids? or generally would you only consider the second deprotonization when dealing with a strong acid? Also, just...

Mizuno_Mikaela_1D

I recently went to a review session and the TA said that the number of sig figs in your pH number is counted after the decimal( so not including the number in the ones place). For example if the number with the lowest sig figs in your calculation has 2 sig figs and your pH calculated is 7.1345, you ...

Mizuno_Mikaela_1D

You need to find the velocity of the electron first in order to calculate the kinetic energy of the electron. You can't use E=h(nu) to find the Ek because you don't have the frequency of the ejected electron. I think it does make a difference which metal the electron was ejected from but I'm not sur...

Mizuno_Mikaela_1D

I Think I Left The Bromine And Boron In The Cabinet

BrB

Mizuno_Mikaela_1D

I think you should just make sure you can clearly tell what you are labeling and that the dotted lines clearly show differences in energy levels. My TA has been drawing them like how it is in the solutions guide however she puts the labels inside the dotted lines next to the lines. Just make sure if...

Mizuno_Mikaela_1D

I had the same question so I looked it up on youtube and found that for HClO3, you need to recognize that it is an acid. You can tell in this case because the H is before a polyatomic ion. So since it is an acid, that means that the H is attached to one of the O's. So then Cl would go in the center ...

Mizuno_Mikaela_1D

How do we determine covalent character of an ionic bond? I know in the course reader it says the more polarizable the anion, the more covalent character the ionic bond has due to a larger distortion, however I still do not quite understand what that means or how that makes the bond have more covalen...

Mizuno_Mikaela_1D

When finding the number of unpaired electrons predicted for the ground-state configuration of an atom, you are basically writing out the electron configuration and using Hund's rule to determine how many orbitals in the subshells are occupied with only one electron. So for Nickel, the electron confi...

Mizuno_Mikaela_1D

When these two lose electrons, they will be removed from the 4s subshell because for cations, the outermost e- is removed. In this case, since Chromium, Cr is [Ar] 3d5 4s1 and Copper, Cu is [Ar] 3d10 4s1, the 4s1 electron is removed because it is in the outermost electron shell. So... Cu+ would beco...

Mizuno_Mikaela_1D

I know Amy answered this but I figured I would show out all the math for anyone else that needs it. Note: I changed the ΔE so that it was negative since the wavelength is being emitted. You would get the same energy levels if you had a positive ΔE, but ni would have to be 1 instead of nf since when ...

Mizuno_Mikaela_1D

I did a little research and what I found is that when an electron in an excited state goes through an electronic transition, the atom loses energy as the electron moves to a lower energy state. Thus the atom emits light because the energy that was lost is being emitted as a photon. https://www.dartm...

CHEMISTRY COMMUNITY

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Re: Nernst Equation

Re: Practice Problems

Re: Practice Problems

Chem 14C discussion swap

Re: Quiz 3 Winter 2017

Re: Homework problem 1.16 cycloalkane naming

Catalysts in rate law

Re: Quiz 2 Winter 2017

# of elementary steps?

Re: When do you use Cv vs Cp if the question does not explicitly say which conditions it is under?

When do you use Cv vs Cp if the question does not explicitly say which conditions it is under?

Re: Ch. 14 #13

Re: Easy way to remember when electrons are lost/gained

Reversible/Irreversible

Re: Work on or by the system? [ENDORSED]

Peer Learning Sessions for 1/16

Re: Path dependent property

Re: Most Helpful Resource

Ignoring second deprotonizations

Sig Figs in pH

Re: Final exam 2013 Fall Q2A

Re: Post All Chemistry Jokes Here

Re: M.O. Diagram Textbook Problem 4.57

Re: Fall Midterm 2014 Q7

Re: Ionic and Covalent Character

Re: Chapter 2 Question 51 [ENDORSED]

Re: Electron configuration of electrons

Re: 1.15....Where did I go wrong? [ENDORSED]

Re: Unique Frequencies with atoms/molecules