CHEMISTRY COMMUNITY

Kellina Tran 2I

I couldn’t make it to the review sessions covering functional groups, so can someone give me a run-down of how we are being expected to apply them on the exam?

Kellina Tran 2I

I learned in one of the review sessions that for a first-order reaction, as k increases, the reaction speeds up. Is this true and does it apply to other reactions as well? I’m

Kellina Tran 2I

I’m also confused, since our notes say that we should always make the lower concentration the product

Kellina Tran 2I

Are we being expected to derive integrated rate laws on the test or just use them?

Kellina Tran 2I

For the example regarding the oxidation of sulfur dioxide to sulfur trioxide in the presence of platinum, the textbook says that the reaction slows down as the concentration of SO3 increases. However, shouldn’t the reaction speed up because the fractional order of SO3 is 1/2?

Kellina Tran 2I

How exactly do we use the slope of a reaction graph to determine the rate constant k?

Kellina Tran 2I

I believe it is linear and I actually thought it increased, but judging from previous comments, I’m probably mistaken

Kellina Tran 2I

What defines the unique rate of a reaction?

Kellina Tran 2I

On page 612 of the textbook, why is the average rate of consumption of R negative?

Kellina Tran 2I

If I remember correctly, we were always told whether the reaction was acidic or basic in the textbook, so I assume it will be like that on the exam as well

Kellina Tran 2I

I read somewhere that the porous membrane is inside the salt bridge to allow charged ions to flow between the cells, but the salt bridge keeps the water contained

Kellina Tran 2I

I know determining oxidation numbers was covered in 14A, but can someone remind me on how to do so when balancing redox reactions?

Kellina Tran 2I

What’s the difference between being asked to calculate the amount of thermal energy versus the amount of heat required to raise a substance to a certain temperature?

Kellina Tran 2I

Can someone who went to Joe’s review session tonight give me a breakdown of the steps to calculate the last problem calculating deltaG using numbers as well please? Thank you!

Kellina Tran 2I

For anyone who went to Joe’s review session today, can someone give me a run-through on the steps to solve the problem he gave us with calculating the total deltaS for vaporization of C2H5OH, including the numbers you got for each step? I keep getting the wrong answer and I’m not sure why. I believe...

Kellina Tran 2I

I think even if the solution should manual doesn’t always use the + sign, it would be preferable to use it for tests/exams

Kellina Tran 2I

I’m not completely sure, but I feel like it might have something to do with it having to be in standard state because it says “Assume ideal behavior.” Someone correct me if I’m wrong

Kellina Tran 2I

There are 3 different equations to calculate deltaG. When do we use each of them?

Kellina Tran 2I

Under what conditions did Dr. Lavelle mention that the energy available to do work is considered Gibbs free energy?

Kellina Tran 2I

I believe we only use it for reversible reactions, but someone correct me if I’m wrong

Kellina Tran 2I

I’m not completely sure, but I vaguely remembering him saying spontaneous processes are favorable, but correct me if I’m wrong

Kellina Tran 2I

In short, reversible processes do more work than irreversible processes because it is exerting work upon a higher external pressure.

Kellina Tran 2I

As seen in the solutions manual, where did the 6.01 kJ.mol^-1 come from?

Kellina Tran 2I

If we encounter a problem such as 19, will we be given the heat capacity for elements such as copper?

Kellina Tran 2I

On page 269 of the textbook, it says the units for specific heat capacity is J. degrees Celsius^-1. g^-1, or J. K^-1. g^-1. Does the K stand for Kelvin and if so, how is that equivalent to degrees Celsius?

Kellina Tran 2I

What does the R represent in the formula for reversible expansion?

Kellina Tran 2I

Why is it that the answer is written as +4.90 x 10^2 J instead of kept as 490 J?

Kellina Tran 2I

The temperature remains constant because the heat being supplied is used up to initiate the phase transition, aka to melt/boil.

Kellina Tran 2I

Dr. Lavelle has mentioned in class before that his method is to round to the nearest even number if it ends in a 5, so I would assume that is the way he would prefer it to be on exams/tests. I doubt you would get docked off points for rounding it to 449 though.

Kellina Tran 2I

I think the most simple way to think of it is that enthalpy is determined by the amount of heat released or absorbed, rather than by the substance heat itself.

Kellina Tran 2I

Can someone please summarize for me how to determine what kind of hybridization an element in a compound goes through? I’m just lost and need a step-by-step break down

Kellina Tran 2I

How can I determine if a compound is polar or nonpolar from its molecular shape?

Kellina Tran 2I

What is the unit we should be using for temperature in PV=nRT?

Kellina Tran 2I

How do I determine the oxidation state of a coordination compound?

Kellina Tran 2I

A possible reason why is that because a bonding pair is held in place by two atoms, its electron cloud can not spread over as large of a volume as a lone pair can. (Textbook pg.21)

Kellina Tran 2I

Just to add on to the previous response, you want there to be the least amount of repulsion and energy where the lone pair is placed. I’m an equatorial position, it is only close to two atoms, versus three atoms in an axial position, so the former is the ideal arrangement.

Kellina Tran 2I

Why is it that molecules with the same general VSEPR formula can still differ in angle degrees?

Kellina Tran 2I

I am confused as to why 4.7 is a trigonal pyramidal but 4.9 is not? I have a feeling it has something to do with electron repulsion, but I don't quite understand it fully.

Kellina Tran 2I

The questions will be very specific, either asking you to draw the most stable structure or just one resonance structure, etc.

Kellina Tran 2I

Yes, so if you are trying to find the wavelength of an ejected electron, you must use the De Brogile equation an its momentum. You cannot use E = hv and other extensions of it.

Kellina Tran 2I

Can someone please summarize the key points of section 2.1? I am confused about the relationship of Schrodinger's equation to wave functions and orbitals. Also, on the outline, what does it mean by the interpretation of atomic orbitals in terms of probability? Sorry that's quite a few questions, but...

Kellina Tran 2I

How do we know when the electrons in an atom are in its ground state judging from the spins and orbitals?

Kellina Tran 2I

How do I know how many unpaired electrons an element atom has based on its electron configuration?

Kellina Tran 2I

For exercise 45 of chapter 1 regarding the Heisenberg Indeterminacy, the problem tells us that the bowling ball is rolled at 5.00 +/- 5.0 m.s^-1. What does the +/- part tell us and what do we do with that in our work? I noticed that the solutions manual only uses 5.0 m/s^-1, so I am not sure where t...

Kellina Tran 2I

Just to be sure, on the test, will we get marked down points if we only indicate the P state on its own instead of specifically notating Px, Py, and Pz?

Kellina Tran 2I

I am not sure if I understood your question correctly, so feel free to give feedback and elaborate. Which light are you trying to calculate the frequency for? If it's the incoming light that hits the electron, then you use the given total energy of that incoming light or the energy that you calculat...

Kellina Tran 2I

To sum it up, I believe that the negative sign represents the idea that the energy being used to remove the electron (a positive value) must match and thus cancel out the negative value of the required energy to move the electron. As the electron moves from a higher to lower energy level, the energy...

Kellina Tran 2I

Can someone please explain to me what the Bohr frequency equation tells us? In the lecture, I heard something about two things needing to match up with each other, but I did not quite understand it. Thanks in advance!

Kellina Tran 2I

Based on a problem, how do we know how many sig figs we should round to?

Kellina Tran 2I

I believe that the formula for calculating percent change is the original subtracted from the result, divided by the original value. The original value in this problem should be the mass of hydroxyapatite, 502.31 g/mol, but the solutions manual divides the difference by the latter value of flourapat...

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