CHEMISTRY COMMUNITY

Lauryn Jordan 1F

Aside from standard cell potential is there any other intensive things?

Lauryn Jordan 1F

is wmax equal to ΔG° or just ΔG?

Lauryn Jordan 1F

when do you use this equation?

Lauryn Jordan 1F

when do you use this equation?

Lauryn Jordan 1F

for an isobaric equation, since delta p = 0, is the internal energy = delta h?

Lauryn Jordan 1F

I made a note that says bomb calorimeter = constant volume, how would you find the internal energy? does constant volume mean delta v = 0?

Lauryn Jordan 1F

will we need to know functional groups for the final?

Lauryn Jordan 1F

what equation is this and when do you use it?

ln (k1/k2) = Ea/R (1/T2 - 1/T1)

Lauryn Jordan 1F

When do you use rate of formation and/or rate of concentration?

Lauryn Jordan 1F

what is the zeroth order rate? is it -k?

Lauryn Jordan 1F

Did we already go over arrhenius reaction or are we going to?

Lauryn Jordan 1F

are we going to have to derive or integrate the 1st or 2nd order for test 3 or the final?

Lauryn Jordan 1F

when do you use each of the equations and what is the difference?
E = E° -RT/nF * ln Q
E = E° -0.05916 V / n * log Q

Lauryn Jordan 1F

when figuring out which reaction to flip so that you get the highest cell potential, do you add or subtract the two cell potentials?

Lauryn Jordan 1F

if Cl is just 1- charge how come just making Cl -, 2Cl - doesn't make the charges cancel?

Lauryn Jordan 1F

for irreversible expansions, do you use you use w= -p delta v?

Lauryn Jordan 1F

can someone please explain in simple terms and give examples of how to find w for boltzmann equation

Lauryn Jordan 1F

when do you use PV = nRT?

Lauryn Jordan 1F

does being spontaneous have anything to do with speed?

Lauryn Jordan 1F

if something is reversible and isothermal, i know the total internal energy equals 0, therefore q = -w, but what else should i know about this?

Lauryn Jordan 1F

For clarification, If a piston compresses does that mean work is positive? And if it expands does that mean work is negative?

Lauryn Jordan 1F

delta g r*

Lauryn Jordan 1F

what's the difference between delta g, and delta r r, as well as delta g r knot?

Lauryn Jordan 1F

https://lavelle.chem.ucla.edu/wp-conten ... ns_14B.pdf

Lauryn Jordan 1F

how do you find W?

Lauryn Jordan 1F

Do you always have to use kelvin with regards to temperature?

Lauryn Jordan 1F

in question 9.5 why is it -50 j.k? can someone explain where the negative came from

Lauryn Jordan 1F

what are examples of monatomic ideal gasses?

Lauryn Jordan 1F

for measuring temperature in kelvin on the test do we use 273.15 or just 273?

Lauryn Jordan 1F

In class we discussed rxn or physical change between the change in s and change in h, Dr. Lavelle mentioned that when delta s is negative and delta h is positive it is never spontaneous but the reverse is. does this mean that the reverse of the other 3 would not be spontaneous?

Lauryn Jordan 1F

What is 1 calorie?

Lauryn Jordan 1F

Is bond enthalpies the sum of reactions minus the sum of products or the sum of products minus the sum of reactants?

Lauryn Jordan 1F

do we need to know the conversions for calorie and Calorie or will they be provided?

Lauryn Jordan 1F

when must you covert the g to moles when using the equation for specific heat?

Lauryn Jordan 1F

will internal energy be on the test?

Lauryn Jordan 1F

with regards to enthalpy, are we expeced to be able to calculate the heat released at a constant volume or pressure? also what is this 5/2R and 3/2 R business?

Lauryn Jordan 1F

How do you know which heat capacity to use for water?

Lauryn Jordan 1F

What are the three ways you can increase the internal energy of an open system?

Lauryn Jordan 1F

What are the three ways you can increase the internal energy of an open system?

Lauryn Jordan 1F

yeah that makes sense, so my follow up question would be after drawing the electron configurations how could you tell if a bond is broken or formed like what would it look like?

Lauryn Jordan 1F

When looking at a rxn, is there another way aside from looking at the delta h to know if a bond is forming or breaking?

Lauryn Jordan 1F

what is Cm in the equation q = n (delta t) (Cm)?

Lauryn Jordan 1F

soooo my follow up question would be when do you know when work is done on a system vs done by a system?

Lauryn Jordan 1F

with bond enthalpies and standard formation enthalpies, i know they're are equations you must follow, what are they and what is each part of the equation?

Lauryn Jordan 1F

can someone clarify what q and w are as well as how can you tell if they will be positive or negative?

Lauryn Jordan 1F

When do you use kJ.mol, kj. Cº or just kj?

Lauryn Jordan 1F

like if it asks for the ph but gives you the pka how do you find ph?

Lauryn Jordan 1F

would you find the negative log of the pka to find your ka?

Lauryn Jordan 1F

If you are given a pka, how do you go about finding the pH?

Lauryn Jordan 1F

When do you use the c = wavelength x frequency?

Lauryn Jordan 1F

Do we need to memorize the actual electronegativity chart as far as values or is just knowing the basic trend enough?

Lauryn Jordan 1F

what does “ionic character” mean?

Lauryn Jordan 1F

what does “polarizing power” mean? Also what does “more polarizable ion” mean?

Lauryn Jordan 1F

For HClO2 why does it prefer the second O to be connected to the Cl instead of making a chain like Cl-O-O-H?

Lauryn Jordan 1F

I honestly don't know, but I doubt it. I was told to memorize them by my plf. There's also a list of strong bases. LiOH, NaOH, KOH, RbOH, CsOH, Ca(OH)2, Sr(OH)2, and Ba(OH)2

Lauryn Jordan 1F

there is a list of strong acids, if it is not one of those, it is considered weak. the list of strong acids include HCl, HBr, HI, HNO3, HClO3, HClO4, H2SO4

Lauryn Jordan 1F

When do you know the reaction is going backwards instead of forwards ?

Lauryn Jordan 1F

What is your LiFe composed of?

-Lithium and iron

Lauryn Jordan 1F

a single bond has a sigma bond, a double bond has a sigma bond and a pi bond, and a triple bond has a sigma bond and 2 pi bonds

Lauryn Jordan 1F

when drawing a lewis structure if we know the molecular shape of it from vsper do we draw it accordingly? or are we allowed to place the bonds andywhere around the central atom?

Lauryn Jordan 1F

Are we allowed to do chapter 4 for homework due next week or do we do chapter 17?

Lauryn Jordan 1F

Does a lone pair count as a region of e-density when determining the shape?

Lauryn Jordan 1F

What is the significance/origin of the negative sign in Bohr's equation: En=-hR/n^2

Lauryn Jordan 1F

chromium and copper

Lauryn Jordan 1F

How can you tell if a compound is polar or non polar?

Lauryn Jordan 1F

Michael Cheng 1B wrote:What is the difference between electron affinity and electronegativity?

Electronegativity is how well an atom can attract electrons, while electron affinity is how much energy an atom releases when an electron is added.They both share the trend of increasing from bottom to top and left to right.

Lauryn Jordan 1F

Is the homework for this week chapter 3 or 4?

Lauryn Jordan 1F

the l value is n-1, what you are talking about is ml, and it is -l to +l

Lauryn Jordan 1F

you would need to know how many total electrons there are in the atom, what is the last subshell being used, and how many electrons can that subshell hold. Then in the last subshell, you put one arrow in each of the orbitals and then come back around to fill them. for example, if it was oxygen, ther...

Lauryn Jordan 1F

electron affinity increases from left to right and increases from bottom to top, thereby making fluorine the most electron affinitive. (if that's a word)

Lauryn Jordan 1F

When dealing with an atom that is an ion for example S^2- is it incorrect to write it in condensed from as [Ar]?

Lauryn Jordan 1F

Yesterday we were trying to write rhodium’s electron configuration and we got 2 different answers, so then we looked at the lavelle periodic table and clarified which one is correct, so for clarification, is rhodium an exception like cooper and chromium?

Lauryn Jordan 1F

So for elements after 20 would you fill up the 4s and then return back to 3d or fill up 3D and then proceed?

Lauryn Jordan 1F

Do we have to print out the reference sheet ourselves or will it be given in class?

Lauryn Jordan 1F

If it was .5060 and you wrote it in scientific notation, It would be 5.060 x 10^-1 so would there be 3 or 4 sig figs?

Lauryn Jordan 1F

It could also ask instead of limiting reactant, which one is the excess and how much excess is there? Or it could ask how many moles can be produced?

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