CHEMISTRY COMMUNITY

Derek Lee 2K

6 questions!! It's all in that finals post that disappeared somewhere

Derek Lee 2K

I would email your TA. It wouldn't hurt to take it for the practice.

Derek Lee 2K

The kinetics stuff should only be like the last couple concepts like the Arrhenius equation.

Derek Lee 2K

Heterogenous enzymes exist as well. Whenever it catalyzes a reaction and is in a different state from the reactant then it's heterogenous.

Derek Lee 2K

You can tell by looking at the steps and identifying which molecule didn't change. Intermediates are like "in between" molecules so their structure changes. But catalysts don't chemically change in a reaction. If you see that they're the same on both the reactant and product side of a reac...

Derek Lee 2K

Are we still able to switch this late into the quarter?

Derek Lee 2K

I think it will be given for the most part. And if not, the way you describe how to approach the rate law should work out as well too.

Derek Lee 2K

Does quiz 2 just cover up to the end of kinetics? Is it cumulative?

Derek Lee 2K

I believe they should all be given for the most part.

Derek Lee 2K

They don't post but I heard that they're passing them back out after lecture on Wednesday I believe.

Derek Lee 2K

It basically boils down to irreversible reactions which is the first equation and reversible ones which is the second.

Derek Lee 2K

When it refers to 1 mol of reactants I believe it has a different notation. (the delta H with the little circle). Delta H on its own is just the enthalpy of the reaction as a whole.

Derek Lee 2K

I thought you solved for the change in pressure and the change in volume both for the two entropies and they can be put together?

Derek Lee 2K

He said he'd give it to us, but since you have it memorized you're all good.

Derek Lee 2K

It has to do with the bonds in each phase. Solid to liquid, you're just loosening the bonds to the point that they can slide next to each other (liquid). However, it requires more energy to vaporize than to melt because you're completely breaking apart the bonds in water which requires much more ene...

Derek Lee 2K

I believe you still use double since it's still an equilibrium reaction. At least this is what my TA said.

Derek Lee 2K

It always seems to round off to three sig figs for me. But not sure, commenting on this post to follow because I have the same question.

Derek Lee 2K

It is only really necessary when you're describing how many bonds it can make. ex) Monodentate

Derek Lee 2K

I did that but I still end up with a value for x that is too small. What numbers did you have after doing PV=nRT?

Derek Lee 2K

The way I've been doing it and how the solution manual shows you is to do a basic sketch of the structure and then you look at which atoms have lone pairs. Lone pairs means its free to bind to another atom so you count up the atoms with lone pairs and that corresponds to what type of polydentate it ...

Derek Lee 2K

All the naming material that we're covering now and molecular orbital theory is what my TA told me.

Derek Lee 2K

He said up to chapter 4. Basically fundamentals to chapter 4.

Derek Lee 2K

Ground state just means that the electron is in the lowest energy form possible. That means that the electron is in the orbital we would normally expect it to be. Excited states are when electrons are not in the correct orbital. So, in 39 for example, the carbon is excited because the second 2p elec...

Derek Lee 2K

Yeah that's true, it just kind of varies from problem to problem. To be honest, your way is probably better but I'm just saying that whichever way you do it, at least the solution manual kind of verifies that you're ok so I wouldn't freak out too much if its confusing you.

Derek Lee 2K

My TA said to always use it because they give partial credit if we at least find the energy of each n level. He said that if we use ryberg's, if we mess up the calculation in any way and get the wrong answer, then the whole thing is wrong and there's no partial credit.

Derek Lee 2K

What's the difference between the two? I didn't fully understand. Does it just have to do with the spin or something?

Derek Lee 2K

From looking at the solutions in the textbook solutions manual and workbook, it constantly wants us to round off to the proper number of sig figs at each step of the problem. If you do that, it's easier to keep track of sig figs from the beginning because you just end up with the smallest number of ...

Derek Lee 2K

I'm not sure if this is correct but I was taught in high school chem that you can generally put them back into the order they were presented to you. I've done some problems from the book and the solution manual generally does the same too.

Derek Lee 2K

It's always good to keep track of them as you go. At least look at the numbers you're starting out with and make sure that the sig figs at the beginning of the problem match the end of the problem. However, as you're working along the problem, you can be off in terms of sig figs one or two places an...

Derek Lee 2K

I would like to join this as well! PM me.

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