CHEMISTRY COMMUNITY

BenJohnson1H

Mt TA had no answer for this either, I think it's safe to assume that the book mistakenly assumes there is no need for conversion.

BenJohnson1H

When calculating the E cell, lyndon did not use E= E cathode- E anode, would it still be ok to use this?

BenJohnson1H

Will this even be something well need on the test?

BenJohnson1H

Yes, it is further up in this thread and there is a key as well. There's also two parts!

BenJohnson1H

Yay! Thanks Esther:)))<3

BenJohnson1H

"Suppose that 3 moles of H2(g) and 6 moles of F2(g) are mixed in a 3L flask." Using this information, you can plug the moles and liters into concentration=moles/liters. Thus the initial concentration of H2, [H2] is 1 and the initial concentration of F2, [F2] is 2. These are all initial so ...

BenJohnson1H

I would do every homework problem in that section just in case for review for the test.

BenJohnson1H

Correct, for a 0 order reaction, the reactant's concentration that is zero order would be left out

BenJohnson1H

Because we will be studying rate constants bases on reactants, the rates of disappearance of reactants are likely what we'll be basing our rate laws on for the final

BenJohnson1H

I still don't conceptually understand how the pH would change if H+ and OH- are at equivalent concentrations

BenJohnson1H

So deltaH in the plant would be positive as it is absorbing heat, T would be a certain temp, 298K for example, and deltaS would also be positive?

BenJohnson1H

How does one calculate the frequency factor, A, in the Arrhenius equation?

BenJohnson1H

Can someone explain to me why the answer is 39 kJ instead of my answer which was 37.4 kJ?

BenJohnson1H

In the review session today, the TA said that using L is also acceptable. It's simply expanding molarity:)

BenJohnson1H

Would it be correct that you need to know either the t1/2 or the [R]o to solve anything in the half life equation?

BenJohnson1H

Is it acceptable to not round, even when permitted to, on the test?

BenJohnson1H

Would be acceptable to not round the order and only round the value of the answer, which may be the rate constant, for example?

BenJohnson1H

It might be better put as the rate is independent of the concentration of a zeroth order reactant but yes, this is true

BenJohnson1H

Would a negative order indicate that the reactant also participates in some type of reverse reaction?

BenJohnson1H

Think this: cup=open system, water bottle=closed system, hydroflask=isolated system

BenJohnson1H

T can be completely canceled out. Think of it as the -q=w. Because the function for work involves the multiplication of T but deltaS is q/T, the q is simply taken out and the negative sign is omitted.

BenJohnson1H

If the moles of gas is not given and not able to calculate, is it safe to assume that it is 1 mole?

BenJohnson1H

So essentially, in this case, deltaU=deltaV

BenJohnson1H

And likewise, in some cases this fraction will be 5/2 or 7/2 depending on the molecules. The text book has a more detailed explanation.

BenJohnson1H

Sometimes one is needed to find the other, it depends on what units the answer must be in and sometimes conversions must be made accordingly

BenJohnson1H

If the gas constant, R, must be used, would it be given on the test?

BenJohnson1H

A calorimeter measures the heat capacity of a substance under either unchanging volume or unchanging pressure.

BenJohnson1H

Its also important to note that occasionally the book says "molar heat" or "specific heat" which simply are shorthand for molar heat capacity and specific heat capacity respectively.

BenJohnson1H

Can someone give an example of this with actual chemicals and calculations?

BenJohnson1H

precisely, unless it is a cubic in which you would have three possible values of X. Then plug the values in to see which value is viable

BenJohnson1H

When k is equal to or less than 10^3 you can omit any X that is being added or subtracted. To check, see if the dissociation of the acid/base is equal to or lower than 5%

BenJohnson1H

When k is equal to or less than 10^3 you can omit any X that is being added or subtracted. To check, see if the dissociation of the acid/base is equal to or lower than 5%.

BenJohnson1H

What exactly does each letter represent in PV=nRT? Specifically n, is that the amount of something in moles?

BenJohnson1H

Can someone give an example of how PV=nRT is used to convert Kp to Kc? Like, does R and T end up being contained in the answer?

BenJohnson1H

Are R and T constants? And if so, will we ever have to know their values?

BenJohnson1H

Without myoglobin, is hemoglobin square planer about Fe?

BenJohnson1H

Why can it only occur with N O and F?

BenJohnson1H

Why would strong acids be conjugates of weak bases and vis versa? This concept escapes me.

BenJohnson1H

Yes, page 464 in the 7th edition textbook

BenJohnson1H

Would we be required to name the actual compound? ie. CH2CH2N...

BenJohnson1H

ethylenediamine and ethylenediaminetetraacetato respectively

BenJohnson1H

Ok, thanks guys!!

BenJohnson1H

So when calculating the pH of an acid and base reaction, would you need to put both into one equation or write equations separately for each?

BenJohnson1H

Is this also true for the upcoming final? (fall 2018)

BenJohnson1H

Would the concentrations [H+] and [A] be divided by the concentration of the concentration of [HA]?

BenJohnson1H

Fe has a +2 charge. You know this because the entire ligand has a 1+ charge while Cl has a 1- charge. Thus the ligand must contain two positive charges to cancel this Cl's 1-. Since OH2 is neutral, these two positive charges are derived from Fe, giving it a 2+ charge.

BenJohnson1H

To convey that the transition metal (d-block metal) is bonding with the NH3 at the Nitrogen. They are both exactly the same.

BenJohnson1H

Could someone give a chemical reaction showing either a Bronsted Base recieving a proton or vis versa with a Bronsted Acid? I'm not sure I understand the concept.

BenJohnson1H

So could Van Der Waals bonds potentially cause a molecule that was initially non-polar to be polar? If so is this only for a moment?

BenJohnson1H

Would it be possible to have a quadruple bond? And if so, would this consist of a delta bond?

BenJohnson1H

Can someone explain to me the difference between polarizability and polar power?

BenJohnson1H

Would it be safe to just assume that the bond lengths are just the average of all bond lengths on a quiz or test?

BenJohnson1H

My TA said that points might be marked off if the lewis structure was not accompanied by formal charges on the midterm. I recommend writing them just in case.

BenJohnson1H

Would it also be correct to say that the more polar a molecule is, the more soluble it is?

BenJohnson1H

Is there a possible way to determine whether the spin is +1/2 or -1/2?

BenJohnson1H

Will Schrodinger be on the midterm? If not then why is there a review session on it?

BenJohnson1H

What is the meaning of degeneration of an element?

BenJohnson1H

Would it be correct to say that 4d could have n=4, l=2, ml=-1, and ms=+1/2? and if so, would it be correct to assume that each possible configuration of quantum numbers for 4d represents an electron, giving the total number of electrons in that shell?

BenJohnson1H

Will Black Body Radiation be on the test?

BenJohnson1H

From my understanding, the Schrodinger Equation will not be in the test next week but Professor Lavelle taught us the equation to further understand orbitals

BenJohnson1H

How can the momentum of a photon be calculated when a photon is essentially massless?

BenJohnson1H

I don't think the date has been announced yet

BenJohnson1H

Does anyone know where one could find a solutions manual for the 6th edition textbook? The answers are in the back but I was hoping to find a manual with explanations. Thanks!

BenJohnson1H

Typically, the reagent is the tangible and physical form of the reactant as seen in a lab, not just a hypothetical reactant on paper.

BenJohnson1H

From what I understand, "formula units" can be somewhat interchangeable with molecules. For example, how many formula units of H20 are in 2g of water?
the answer would be 6.7x10^22 formula units

BenJohnson1H

Thank you so much! I was just confused as there are Self Test answers with similar labels.

BenJohnson1H

I'm in Hedrick too! I can't join you tonight but I'd love to join the study group if it's ongoing!

BenJohnson1H

What page do you find the e section answers if you're using 6th edition?

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