CHEMISTRY COMMUNITY

Jennifer Lathrop 1F

practice exam name is pork ramen and will be posted tomorrow at 9 am

Jennifer Lathrop 1F

its pork ramen if anyone else was wondering

Jennifer Lathrop 1F

does anyone know what is the name of his session?

Jennifer Lathrop 1F

3-6 in Dodd 147

Jennifer Lathrop 1F

His is on saturday I believe

Jennifer Lathrop 1F

There are many review sessions that have been emailed/ posted, along with many plfs. There are a couple each day leading up to the final.

Jennifer Lathrop 1F

is there a conceptual way to know if an equation is the slow step just by looking at it? Such as if some molecules are known to react together slower?

Jennifer Lathrop 1F

thank you!

Jennifer Lathrop 1F

^ I have the same question

Jennifer Lathrop 1F

or are those the same?

Jennifer Lathrop 1F

how do you know when to use it as a Boltzmann's constant or a rate constant?

Jennifer Lathrop 1F

6K.5 in 7th addition, in part a) for the oxygen reaction, water on the right side cancels out and gets removed, leaving only water on the left side. for the bromide reaction, 3H2O is on the left with 6H2O on the right, leaving them on both sides. It seems like you should be able to cancel out the le...

Jennifer Lathrop 1F

I'm not sure exactly how to word this, but when balancing a redox reaction that takes place in a basic solution, water is placed on both sides of the reaction. In the solution manual, sometimes the water is cancelled out, and other times water is kept on both sides of the equation. Is there a reason...

Jennifer Lathrop 1F

average, in terms of reaction rates, is the change in molar concentration during an interval divided by that time interval. Instantaneous is pretty much the same thing but regarding a specific point of interest. So instead of a rate over a period of time, instantaneous is like a snapshot of what the...

Jennifer Lathrop 1F

got it thank you!

Jennifer Lathrop 1F

i just checked my email and I didn't receive one with review sessions, is it posted on the website anywhere?

Jennifer Lathrop 1F

C- is considered passing I believe. If you get a D+ though you will still get credit from the course but will not be able to move in the series. That was the case for 14A and I would assume it would be similar for this course as well.

Jennifer Lathrop 1F

thanks!

Jennifer Lathrop 1F

thanks!

Jennifer Lathrop 1F

That's perfect thank you so much

Jennifer Lathrop 1F

I was out of the state this week and was not able to attend lecture. Could someone tell me how much of the outline has been gone over in lecture so I can read to where we are? Thank you!

Jennifer Lathrop 1F

He usually will announce all of the new review sessions before week ten

Jennifer Lathrop 1F

Thank you!

Jennifer Lathrop 1F

Makes sense now, thank you!

Jennifer Lathrop 1F

Great thank you!

Jennifer Lathrop 1F

Does anyone have any helpful hints or tips on remembering all of the different equations? I know we are given many equations when we take exams, but I was just wondering if anyone has a way that has helped them remember equations that we are not given.

Jennifer Lathrop 1F

Hi, I was absent on Friday (2/15) due to a swim meet, and I would really appreciate if someone could post a photo of their notes, or tell me what topics were covered during lecture. Were there any announcements made during class? Thanks!

Jennifer Lathrop 1F

Thank you!

Jennifer Lathrop 1F

Thank you!

Jennifer Lathrop 1F

How do you know when to use q=nC(delta)T , q=mCdeltaT or just q=C(delta)T

Jennifer Lathrop 1F

On the website, it states that the midterm covers Chemical Equilibrium, Acid and Base Equilibria, Thermochemistry, Thermodynamics to the end of entropy. Does anyone know in terms of homework problems where to study to? Preferably for the 7th addition?

Jennifer Lathrop 1F

thank you!

Jennifer Lathrop 1F

Thank you all!

Jennifer Lathrop 1F

Thank you!

Jennifer Lathrop 1F

On the formula sheet,Cp=(5/2)R. In the book, this is only true in regards to atoms, but for linear molecules its stated at Cp=(7/2)R. In the example 4C.1 for 7th addition they use (7/2). Cv is similar with Cv=(3/2)R and (5/2)R for linear molecules. When do you know which equation to use?

Jennifer Lathrop 1F

I read somewhere that the post module assessments are mandatory, but they are also anonymous. Is this just basically saying that they are highly recommended? I also could be recalling that incorrectly too.

Jennifer Lathrop 1F

Could someone explain why this is an equation? Like how was this derived and when to apply it?

Jennifer Lathrop 1F

Outline 2 states that we should be able to calculate the pH in a variety of different applied examples. One of which is death in a biological system. I don't really recall this is lecture or in the book. If anyone has notes from lecture or a page in the book let me know! Thank you

Jennifer Lathrop 1F

Is there a way to tell if a reaction is endo or exothermic by looking at the equation?

Jennifer Lathrop 1F

Does anyone know what specifically will be on test one? Will it be strictly outline 1? Or will it include acid/base as well?

Jennifer Lathrop 1F

When do you know if you should use to the equation to convert it or not?

Jennifer Lathrop 1F

I am still very confused on when to use the partial pressures or concentrations to calculate k. What will it say in the problem to suggest which to use?

Jennifer Lathrop 1F

I would definitely spend the time to really get used to using chemistry community, the more you take advantage of it the more it helps. Even if you don't reach out to other students for study groups, you can still get quick and easy help and sometimes tests/midterms/finals reference discussions made...

Jennifer Lathrop 1F

Hello, I had to miss lecture today due to a swim meet, and would be so grateful if someone could tell me the general topics/ announcements that were made in class today. Thank you!

Jennifer Lathrop 1F

Besides acid rain, are there any other biological examples of acid/base that we should be familiar with?

Jennifer Lathrop 1F

For this question, you have to determine whether hypobromite ion or morphine is a stronger base. Then, in the solutions manual, they state that hypobromite is a stronger base because the pKb value is lower. How is this determined when the only thing you are given is the the chemical formula? Am I mi...

Jennifer Lathrop 1F

I see cyanido and cyano are both used in the book/solutions manual. Are these the same or are they different compounds?

Jennifer Lathrop 1F

Thank you so much!

Jennifer Lathrop 1F

For the ionic equations for acids/bases, do weak acids break up into ions? Or do they stay whole when you write the equation?

Jennifer Lathrop 1F

I'm out of the state right now and was unable to attend lecture today. If someone could post the notes for today as well as any announcements that would be amazing. Thanks so much!

Jennifer Lathrop 1F

does a lone pair count as an atomic orbital? For some reason my answers have been different than the key and would only be possible if a lone pair counts I think.

Jennifer Lathrop 1F

How is CH2Cl2 polar? The structure appears to be tetrahedral to me.

Jennifer Lathrop 1F

Can the term coordination number apply to all molecules? or only some?

Jennifer Lathrop 1F

I'm still a little bit confused about hybridized orbitals in terms of what causes them (if that makes sense). Do all molecules have hybridized orbitals?

Jennifer Lathrop 1F

Has anyone said anything about how much high school chem will be on it? (empirical formula etc)

Jennifer Lathrop 1F

Do lone pairs on non central atoms affect the shape of the molecule?

Jennifer Lathrop 1F

What is the difference between high electron density and high electron concentration? Or are they the same thing?

Jennifer Lathrop 1F

is there a set degree that a lone pair shifts the surrounding bonds around it? Or does this just come from experiments?

Jennifer Lathrop 1F

For this, is there a way to calculate or memorize bond angles when there is a lone pair? It is usually slightly different than the angles of the normal structure. Is there a set degree amount that a lone pair shifts a bond?

Jennifer Lathrop 1F

Will molecules of the same shape always have the same bond angles? Like will all tetrahedral molecules etc have the same angles regardless of the molecule?

Jennifer Lathrop 1F

Is there any common bond lengths that we should be familiar with?

Jennifer Lathrop 1F

Additionally, would it be important to be familiar with the energies of different types of bonds?

Jennifer Lathrop 1F

The book states that most bonds are somewhere in between purely covalent and purely ionic. When depicting these bonds, how does one know when to depict a bond as ionic or covalent when it is in this in between state?

Jennifer Lathrop 1F

If I remember correctly it was mentioned that some p-block atoms can have more than an octet. Is there a way to tell if a certain atom can form more than an octet? Or is it something that is easier just to memorize?

Jennifer Lathrop 1F

I was confused about the naming of certain elements and calling them a lewis acid or base. What makes these elements an acid or base? Or is it just based on if they donate a lone pair or not?

Jennifer Lathrop 1F

does electron affinity and electronegativity have the same trends on the periodic table?

Jennifer Lathrop 1F

How do the units in the equation cancel out? What units are you left with after the equation has been completed?

Jennifer Lathrop 1F

I find that the test questions always have a bit of a higher level of thinking than is required in the homework problems. What is the best way to study problem solving?

Jennifer Lathrop 1F

I was confused on this as well, in high school I was always taught to write 4s3d but in the book and in class it has 3d before 4s. Is there a difference between the two?

Jennifer Lathrop 1F

I haven't been able to register until now, could I make up the points by posting more this week?

Jennifer Lathrop 1F

Yes, it just means number of atoms which means you use 6.022x10^23

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