CHEMISTRY COMMUNITY

Patricia Macalalag 2E

Yes!! This was very helpful

Patricia Macalalag 2E

Yes enthalpy is a state function.

Patricia Macalalag 2E

Yes it's the same

Patricia Macalalag 2E

For part b) isn't the answer no effect? The textbook says catalysts have no effect on the equilibrium composition.

Patricia Macalalag 2E

I think it's up to #39, but I'd take a look at the integrated exercises

Patricia Macalalag 2E

You can leave it out because it has no effect on the rate.

Patricia Macalalag 2E

Knowing the derivations can only help you not hurt you!

Patricia Macalalag 2E

I looked up negative order and apparently it indicates that the concentration of that species inversely affects the rate of the reaction. I'll link the site below

https://chem.libretexts.org/Core/Physic ... tion_Order

Patricia Macalalag 2E

We stop after #39 I believe

Patricia Macalalag 2E

My TA said we won't have to do any derivations on the test, but knowing them does help increase understanding of the concepts

Patricia Macalalag 2E

It's the same thing, you should get the same answer.

Patricia Macalalag 2E

allyz1F wrote:What about for salt bridges too? When do you know to include a salt bridge in the cell diagram and when is it not necessary?

The salt bridge maintains the charges between the anode and cathode so the reaction can happen, but you don't always have to use a salt bridge. Porous disks work as well.

Patricia Macalalag 2E

chem mod posted in another post that electrodes and solids are furthest from the salt bridge, followed by liquids, gases, and aqueous solutions, but most people usually order it reactants to products

Patricia Macalalag 2E

The half reactions are given on the test

Patricia Macalalag 2E

Yes, w=0.

Patricia Macalalag 2E

Either way is fine

Patricia Macalalag 2E

The current should stop

Patricia Macalalag 2E

kb is Boltzmann's constant, and it's given to us in the constants and formulas sheet

Patricia Macalalag 2E

They accepted multiple answers. Mine was "energy cannot be created or destroyed; it must be exchanged."

Patricia Macalalag 2E

No it's not bruincasted

Patricia Macalalag 2E

The signs dictate the flow of energy

Patricia Macalalag 2E

I think it's just to make calculations simpler

Patricia Macalalag 2E

What kind of dogs do chemists have?

Laboratory retrievers

Patricia Macalalag 2E

8.103 is a suggested problem though, so I'd know how to do it

Patricia Macalalag 2E

Lauryn Jordan 1F wrote:will internal energy be on the test?

We won't be required to solve for internal energy, I believe, but there will probably be concept questions on it.

Patricia Macalalag 2E

Gurkriti Ahluwalia 1K wrote:can someone therefore explain why a isn't the correct choice also??

I think A isn't the correct choice either because melting is supposed to occur twice as fast as vaporization. In A, it's the opposite; vaporization occurs twice as fast as melting.

Patricia Macalalag 2E

Are you referring to 8.1?

Patricia Macalalag 2E

I just checked the outlines on the Chem 14B website, and I don't see any acid/base stuff. I could be wrong though.

Patricia Macalalag 2E

^^I don't think so. The textbook only defines open, closed, and isolated systems.

Patricia Macalalag 2E

I can't tell you any good chemistry jokes because all the good ones argon.

Patricia Macalalag 2E

Yes 3 a week, and they don't rollover so you can't make up points.

Patricia Macalalag 2E

No, I don't think so

Patricia Macalalag 2E

Delocalized just means that your electrons can move around, so it's associated with resonance structures.

Patricia Macalalag 2E

Yes; if an acid is strong, it'll have a weak conjugate base. If an acid is weak, it'll have a strong conjugate base.

Patricia Macalalag 2E

Patricia Macalalag 2E

At one of the review sessions, we were told to just count up the nitrogens!

Patricia Macalalag 2E

When you plug 2.6 into 5-2x, you get a negative value

Patricia Macalalag 2E

I'm pretty sure we don't have to memorize it.

Patricia Macalalag 2E

I believe it's because the problem asks for equilibrium concentration, rather than partial pressure. If you look at 11.27, it asks for partial pressure instead, and you would use the notation with "P."

Patricia Macalalag 2E

It also helps to just remember Fluorine is the most electronegative, so you know elements to the upper right will be very electronegative.

Patricia Macalalag 2E

Usually, coordination # = # of the bonds linked to the central atom (usually a metal from what we've been doing)

Patricia Macalalag 2E

Isn't it usually the metal?

Patricia Macalalag 2E

It is delocalized because the e- can move around, resulting in resonance structures. This is only seen when a pi-bond is present.

Patricia Macalalag 2E

How do we know when to use the prefixes: bis-, tris-, tetrakis-, etc.?

Patricia Macalalag 2E

I think you're supposed compare the electronegativity of the atoms and their respective arrangement in the shape of the molecule; this should help you determine dipole moments. This in turn should help determine polarity.

Patricia Macalalag 2E

Aren't we just supposed to analyze the electronegativity trend on the periodic table? It increases as you go left to right, and as you go up a group.

Patricia Macalalag 2E

^^ Yeah a double bond cannot consist of two pi bonds

Patricia Macalalag 2E

@Helen, not necessarily because we don't know if the threshold has been surpassed

Patricia Macalalag 2E

I'm female.

Fe = Iron
Male = man

Therefore, I am Iron Man.

Patricia Macalalag 2E

Don't get chemists angry, they overreact.

Patricia Macalalag 2E

What's the formula for seawater?

CH20

Patricia Macalalag 2E

Don't forget that the units for Planck's Constant are joules times seconds!

Patricia Macalalag 2E

How would you approach this problem from the modules? The meter was defined in 1963 as 1,650,763.73 wavelengths of radiation emitted by krypton-86 (it has since been redefined). What is the wavelength of this krypton-86 radiation? To what region of the electromagnetic spectrum does this wavelength c...

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