CHEMISTRY COMMUNITY

Ilan Shavolian 1K

What is a Boltzmann Distribution exactly?

Ilan Shavolian 1K

i thought this was a set up to a joke lmao

Ilan Shavolian 1K

I believe you can safely assume that the entropy difference from liquid to gas is going to more than the increase in entropy of a more complex molecule.

Ilan Shavolian 1K

O₃/O₂, OH^- and O₃, H⁺/O₂

Ilan Shavolian 1K

Matthew 1C wrote:In regards to the graphs, how do you know what the y intercepts are?

i think for zero order its [A]₀, for first order it's ln([A]₀, and for second, its 1/[A]₀

Ilan Shavolian 1K

yes because 1/4th product is = the amount left after two half lives

Ilan Shavolian 1K

isnt there supposed to be an L,L²... at the top??

Ilan Shavolian 1K

can someone tell me what the slope is for the three orders of the reactions. Is it not just k for all of them?

Ilan Shavolian 1K

there is a difference between a chemical reaction and a reaction mechanism. a reaction mechanism tells us exactly what is happening, so we can say the order. but with a simple chemical reaction we don't know what exactly is happening so we can't say the order

Ilan Shavolian 1K

i think this is just some ambiguity in the solutions manual. the units for k are always mol * L/ s, and they converted to that but just didn't show the work

Ilan Shavolian 1K

Just subtract 1 from the total order of the reactants (x), and than put L^x / mol^x * s

Ilan Shavolian 1K

Wait I am confused, someone said mechanisms shouldn't be on the test and then also the class website says "Test 3 covers Kinetics Chapter 15.1 to end of 15.6"... why is everything fair game? Catalysts and a lot of the other topics weren't really covered in class were they (yet)? Im sure w...

Ilan Shavolian 1K

i think we just decided to use half life as the norm to help have a common understanding.

Ilan Shavolian 1K

Reducing power is the ability of a species to reduce something else. If it's reducing something else, it is being oxidized itself. Therefore, based on reduction potentials, the more negative a potential is, the more likely it will be oxidized (and therefore has a greater reducing power as it is don...

Ilan Shavolian 1K

Justin Folk 3I wrote:How do we know it's a mole of reaction?

What do you mean?? It's the moles of electrons in the balanced reaction.

Ilan Shavolian 1K

pretty basic question but can someone help me understand how to find the oxidation numbers of the atoms in the C₂H₅OH and C₂H₄O?

Ilan Shavolian 1K

We read cell diagrams from left to right and the anodic compartment is on the left and the cathodic on the right. In this particular example, you can imagine a strip of solid zinc metal submerged in an aqueous solution of Zn 2+ ions (there will also be counter-ions to maintain charge neutrality but...

Ilan Shavolian 1K

"more negative" is just kind of a weird concept to understand. It just means it has more of a negative "push" on the electrons, giving the stronger reduction

Ilan Shavolian 1K

platinum acts as an innate (neutral) conducting metal in the galvanic cell when the chemical reaction you are observing doesn't have one.

Ilan Shavolian 1K

Can someone help me expand on what these are, if they're different or not, their function and just general information. Thanks

Ilan Shavolian 1K

Can someone help me understand the flow of the galvanic cell. For example, in ZN(s)|Zn²⁺||Cu²⁺(aq)|Cu(s), what is the metal component and what is the solution in each side. Also what is flowing through the porous wall.

Ilan Shavolian 1K

I think that would work because you increase the vibrational entropy when you increase the number of bonds.

Ilan Shavolian 1K

When should we use these values in the equations?

Ilan Shavolian 1K

Its not on the sheet he gave us online, but I think it's easy to derive. he gave us the two equations needed to derive it on the sheet, so you can just work from there.

Ilan Shavolian 1K

Basically, a reversible pathway is one that is in equilibrium. The external and internal pressures are equal, so work is only done if the external pressure decreases slightly, causing the gas to expand to decrease the internal pressure, allowing the system to come back to equilibrium. That is why f...

Ilan Shavolian 1K

im pretty sure since they are state functions, they can be considered constant

Ilan Shavolian 1K

I also don't get this. I know that for pressure it's Cp, and for volume it's Cv, but I don't exactly understand what that means.

Ilan Shavolian 1K

entropy can be thought of as the number of possible states that a system can occupy. this idea is pretty synonymous with disorder because the more disorder, the more places things can be.

Ilan Shavolian 1K

I said that energy cannot be created or destroyed, so i think if you said something along those lines you'll be fine. I also put the equation deltaU = q + w

Ilan Shavolian 1K

If it could, what would that classify as??

Ilan Shavolian 1K

https://app.groupme.com/join_group/37575346/tzZA0A

i think u have to open it on your phone. this is mainly for disc 1k but anybody can join if you're gonna be helpful and productive

Ilan Shavolian 1K

I'm also wondering if the whole R concept is going to be tested on considering he didn't discuss it in class.

Ilan Shavolian 1K

you may have it confused like i did. The calorimeter basically provides the ideal environment so that you can observe certain aspects of a reaction. Sometimes it says it calibrates the calorimeter. That just means they're finding the heat capacity for that specific calorimeter so that they can see h...

Ilan Shavolian 1K

Is an equation done in a piston that moves considered constant pressure? To explain more, if a chemical reaction expands, it causes a pressure increase, but since the piston is moving, the pressure decreases. In the end, it the net pressure 0?

Ilan Shavolian 1K

I need some help on clarification on why steam burns more than boiling water. So even though the temperature is the same, the steam burns more and this is because it has more energy? What does energy have to do with the amount of pain you feel? Doesn't only depend on the temperature of the substance...

Ilan Shavolian 1K

I may have it confused but isn't molar heat capacity per mole?? So isn't it referring to a relationship/ratio so it wouldn't matter how much you had. Correct me if i have it confused.

Ilan Shavolian 1K

I think it would be considered an open system because matter and energy can be transferred in and out of the system. I guess it depends on the experiment being performed in the fish tank or what aspect you're looking at.

Ilan Shavolian 1K

Michelle Pham_3H wrote:The moles of iodine is in a solid state, so it wouldn't be included when determining which side has more moles of gas.

thanks!

Ilan Shavolian 1K

Timothy Kim 1F wrote:for Week 9, problem 6c, why does expansion favor products?

I also have this question. It seems like there are two moles on each side of the reaction.

Ilan Shavolian 1K

IN the change section of the ICE box for this problem, how do we know that were supposed to do +x, rather than -x?

Ilan Shavolian 1K

thank you guys^^

Ilan Shavolian 1K

Can someone help me understand just what a ligand is?
Is it used when referring to the bonds, or the whole substance?
if its referring to the bond, how is it any different than any other bond?
basically i'm just asking you to tell me all you know about ligands hahaha,
thank you in advance

Ilan Shavolian 1K

Electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels, so you would complete the orbital until moving on to the next. Yes, so spin-pair in the s-orbital and then parallel spins in the p-orbital before spin-pairing in the p orbital. (Right?) this only ap...

Ilan Shavolian 1K

I dont know about the polar and non polar, however if the difference between the electronegativities of two bonded atom is greater than two, than the bond is considered ionic. im pretty sure polar and non polar comes down to drawing the molecule and dipole moments, but someone correct me if I'm wrong.

Ilan Shavolian 1K

also remember that cations are typically smaller, and anions are typically larger.

Ilan Shavolian 1K

In response to Shannon's question, I think that in general, the noble gases should have an electron affinity of basically 0 because they already have a full valence shell and thus would not tend to try to gain or lose electrons. Halogens would have a high electron affinity because they really want ...

Ilan Shavolian 1K

just remember quantum numbers. The l value is the allowed orbitals for each atom.

Ilan Shavolian 1K

Instead of counting each dot and dividing bonds by two, a tip I learned was just to count each component. one dot/ one line= one component. then subtract that from the valence electrons.

Ilan Shavolian 1K

Atoms to the left of the noble gases are almost complete and readily accept electrons and therefore have highly positive electron affinity values. So you can think of negative values of the opposite. Atoms w negative values don't want electrons.

Ilan Shavolian 1K

Can you help explain why it would decrease down a group?

Ilan Shavolian 1K

what helped me understand was looking at this periodic table with all the electron configurations and testing myself
https://sciencenotes.org/color-periodic ... ions-2015/
the text is pretty small but you can zoom in

Ilan Shavolian 1K

also the value of l is 0 to (n-1), so the n must be given if the l isn't

Ilan Shavolian 1K

Using the idea of a wave is a easy way to understand of light works. When relating it to ocean waves we can see how it works. Just like the waves can vary in size and how often waves are coming in, the same variations work for light. Different light has different wave lengths and frequencies to use...

Ilan Shavolian 1K

A weird way i use to remember which is which is to count the vowels. Lyman has one vowel (y doesnt count haha), so n=1, and balmer has two, so n=2

Ilan Shavolian 1K

To add,
is there any specific reason an electron wouldn't automatically just jump back to level one?
is it random?

Ilan Shavolian 1K

Can someone clarify what that specifically means? What direction is that wave going? What is up and what is down to light? Are all of the waves traveling in the same orientation?

Ilan Shavolian 1K

Also, remember that constants don't count for sig figs in your calculations. So if you divide a number by 2, you don't have to round to one sig fig, because 2 is a constant and it is EXACTLY 2. You should only round to sig figs when the numbers you are using were calculated or found scientifically/e...

Ilan Shavolian 1K

Also, its important to remember that oxygen is typically a reactant in combustion reactions. Remember to include this in your equation.

Search found 58 matches