CHEMISTRY COMMUNITY

Mitchell Koss 4G

I invited the UAs to attend so it is possible that at least 1 of them will show up and go over the worksheets. I also feel like the UAs will still post the answers but if not and we work through the worksheets we will be sure to share the solutions.

Mitchell Koss 4G

Review happening today in delta terrace house 6 lounge 6-9pm!!

Mitchell Koss 4G

Of course! And to answer the previous question about food: I personally will not be bringing any or eating during the session but if anyone wants to than that’s fine with me!

Mitchell Koss 4G

Please also comment if you think you will attend! Thanks!

Mitchell Koss 4G

“Earthquake” - FINAL REVIEW SESSION Search “Earthquake” to find this post. Hello, I am organizing a review session on Friday March 13 from 6:00-9:00 pm in the Sunset Village Delta Terrace House 6 Lounge. We will meet in the lounge and go over problems on the whiteboard from the ENDGAME worksheet, a...

Mitchell Koss 4G

CONGRATS!

Mitchell Koss 4G

Hello UAs. Would it be possible to still send out the worksheet for the since canceled Thursday review? And the answers or worked out solutions too? Also, for the ENDGAME review session can we still get answers or worked out solutions? I know the final will be take home and “straightforward” but I r...

Mitchell Koss 4G

We will probably get updates soon but is the in person final still going to take place? What about review sessions and class tomorrow? This class doesn’t have ccle so if there is a video of lecture where will it get posted?

Mitchell Koss 4G

k=rate/[A]

rate=M/s
[A]=M

Mitchell Koss 4G

High Ea means that it takes a great deal of energy to start rxn so it is stable at standard conditions

Mitchell Koss 4G

I don't think you need to know how to derive any. He has said "know how to derive" on every outline but has never asked for just a derivation on a test.

Mitchell Koss 4G

Probably. He may ask if reaction is expected to be slow or fast and if it is endothermic or exothermic, etc.

Mitchell Koss 4G

You can also check units

Mitchell Koss 4G

they don't control a reaction; instead, they are 2 different ways to think about what a reaction produces, uses, and how it proceeds.

Mitchell Koss 4G

lavelle said derivation just for "increased understanding"

Mitchell Koss 4G

In theory we should know how to derive it but no test/exam question has ever had us derive an equ before.

Mitchell Koss 4G

The equ can also be used/written in several forms

Mitchell Koss 4G

In a galvanic cell when the anode deteriorates and the cathode gains metal, where does the metal being added to the cathode come from? Ex: if the anode is silver and the cathode is gold, does silver form on the outside of the gold cathode or does more gold form on the outside of the gold cathode?

Mitchell Koss 4G

If you think about it, for a battery to work, the chemical rxn needs to be spontaneous.

Mitchell Koss 4G

Cause different temp or pressure can change the reaction which would change electricity

Mitchell Koss 4G

Moles is always in moles but R is in different units depending on what units are given

Mitchell Koss 4G

Gibbs also involves K which was not seen in the main section of thermo

Mitchell Koss 4G

This equ can also be used a variety of ways. There are multiple variations of the equ that all lead to the right answer.

Mitchell Koss 4G

Gibbs with K will be on the test but not regular Gibbs stuff

Mitchell Koss 4G

Organic chem tutor has good videos too!

Mitchell Koss 4G

Its to show more detail and so you see where the e- come from

Mitchell Koss 4G

Its not electrochem. Its just a wrap up of thermo and we began a new unit.

Mitchell Koss 4G

Buffers allow for small changes. If only strong acids or bases were used, then small changes wouldn't really be possible.

Mitchell Koss 4G

And the potential will depend on the reaction, just as kinetic potential depends on size and distance.

Mitchell Koss 4G

There is not really a shift but more of a connection that allows e- to flow

Mitchell Koss 4G

All about electron transfer and a major application is batteries

Mitchell Koss 4G

The same elements usually have the same oxidation numbers. The periodic table also has trends.

Mitchell Koss 4G

2 half reactions added together equal the main reaction. It is just a way to show in detail where the e- go

Mitchell Koss 4G

Basically the single reaction can be written as 2 half reactions

Mitchell Koss 4G

just know the examples used in class and you should be fine

Mitchell Koss 4G

Oxidation is e- loss, reduction is e- gain (OIL RIG)

Mitchell Koss 4G

Closed is like a test tube with a cap on it, so solution can be heated or lose heat.
Isolated is behind thick walls like a bomb calorimeter or thermos so no outside interaction can occur.

Mitchell Koss 4G

Although K is really 273.15 you could also just use 273 so it is easier to remember.

Mitchell Koss 4G

I think you should just make sure you know what he covers in class.

Mitchell Koss 4G

...also know that diathermic means heat can transfer!

Mitchell Koss 4G

I do believe calc is a pre/co req but I don't think we will need to do a lot of it. Especially on the midterm where other content will be covered like acids and bases and equilibrium

Mitchell Koss 4G

I haven't done all the HW problems but I don't think he would point us to the antiderivative course page if we didn't need to do some kind of calc.

Mitchell Koss 4G

You can also see if heat is used as a product or reactant for determining exo/endo thermic

Mitchell Koss 4G

The second flat line is longer than the first meaning more energy is involved for making steam from boiling water

Mitchell Koss 4G

It takes longer to break the final bonds so steam burns more

Mitchell Koss 4G

It takes longer for the bonds to break.

Mitchell Koss 4G

The only deviation for standard sig fig rules is pH and logs.

Mitchell Koss 4G

I got mine at the front desk and you can go anytime they are there.

Mitchell Koss 4G

always go back to pH= -log[H30+] and pOH= -log[OH-]. From this you can get the other relationships

Mitchell Koss 4G

x is very small so it is basically zero for the denominator (0.0000000000000000001), but we leave x alone in the numerator cause having 0 up top would make the whole thing=0.

Mitchell Koss 4G

No chem 14A material will not be on our tests. It can be helpful for deeper understanding but I feel like it is not necessary.

Mitchell Koss 4G

Leave H2O out only if it is a liquid. It must be included if it is a gas.

Mitchell Koss 4G

ICE tables are all about equilibrium so there is no need to include solids or liquids.

Mitchell Koss 4G

They will need to give you a delta H, so it it is positive, reaction is endothermic, but if it is negative, it is exothermic.

Mitchell Koss 4G

Yes if a reaction reaches equilibrium, it will have Q=K

Mitchell Koss 4G

Yes, as long as we talk about chem eq which we will.

Mitchell Koss 4G

you can't have the concentration of a solid object

Mitchell Koss 4G

K is definite eq constant but Q is just the value at some time.

Mitchell Koss 4G

K has no units but units you plug in matter, so use mol/L not mL or mol.

Mitchell Koss 4G

P=concentration(RT)

Mitchell Koss 4G

The autoionization of water is an endothermic reaction.

Mitchell Koss 4G

Equilibrium constants are ratios and you cannot just delete the numerator, it needs a place holder.

Mitchell Koss 4G

In module 2, Dr. Lavelle did not use the variable x for the change concentration, but did so in module 3. Should we just stick with always using variables for change concentration to be safe? Are there any cases in which we could not use variables?

Mitchell Koss 4G

Conversely, a very very small K means the left side of the reaction is favored.

Mitchell Koss 4G

I believe it is safe to say that 1 bar is equal to 1 atm

Mitchell Koss 4G

And remember that terms in reactions that are solids or pure liquids are left out of the equilibrium constant.

Mitchell Koss 4G

In online module #2, Dr. Lavelle represents the ICE box change without x terms but just by the concentration. In module 3, he uses x as a variable for the change amount. Should we always use variables from this point on? Are there times we would not be able to use variables?

Mitchell Koss 4G

How much of the naming coordination compounds table are we expected to know? I understand needing to know that Cl has a -1 charge and that it becomes cholro, but do we need to know how to draw edta and write its chemical formula?

Mitchell Koss 4G

2019 key word: marshmallow

Mitchell Koss 4G

The assignments are now available on the class website, the 2pm class is in Moore 100

Mitchell Koss 4G

Cis is same side, trans is opposite side

Mitchell Koss 4G

Also remember that there is pH and pOH

Mitchell Koss 4G

Sig fig rules are standard for any kind of problem

Mitchell Koss 4G

No you do not need to understand how logarithms are derived

Mitchell Koss 4G

You can also add things like a url or YouTube video by looking at the buttons right below the subject line when making a post

Mitchell Koss 4G

Dr. Lavelle said the weekend ends on Sunday 11:59 so that is when things are due

Mitchell Koss 4G

Online can get complicated so I just keep a piece of paper with a tally.

Mitchell Koss 4G

Since electrons are negative and protons are positive the relationship can become confused but drawing a diagram can help

Mitchell Koss 4G

Dr. Lavelle also highlighted in class that when discussing clean vs dirty coal, clean coal doesn’t emit as much SO3 as dirty coal

Mitchell Koss 4G

Bronstead vs Lewis is really the same concept, the difference is the level of detail each gives, with Lewis focusing on the electrons, and Bronstead focusing on the general shift.

Mitchell Koss 4G

Not necessarily but it is helpful to know the common ones.

Mitchell Koss 4G

Dr. Lavelle also just sent an email with a naming chart that is helpful

Mitchell Koss 4G

In simpler terms: 2 Cl on one side can form 2 bonds; 2 Cl on opposite side can only form 1 bond. 1 bond is easier to break than 2, so the cisplatin bond is harder to break.

Mitchell Koss 4G

It is helpful to watch a YouTube video explaining the difference as many can be determined without looking at Lewis diagram

Mitchell Koss 4G

The electron domain shape is needed for bond angles but only the molecular shape is specifically asked for on a test for example.

Mitchell Koss 4G

My TA said they will begin grading over Thanksgiving so we prop shouldn’t expect a grade back until week 10

Mitchell Koss 4G

Also, don’t confuse frequency (v) with velocity (v)

Mitchell Koss 4G

However, being electronegative does not make an atom small, it is being small that would impact electronegativity

Mitchell Koss 4G

Ionization energy does not follow the trend in this case, but electronegativity does.

Mitchell Koss 4G

Also guessing which state an element/compound is usually works if you are unsure.

Mitchell Koss 4G

I believe so.

Mitchell Koss 4G

Although it would be smart to do some of the later problems about Lewis structures since that ties into what we are just beginning to talk about in class regarding shape.

Mitchell Koss 4G

Combustion is also unique in that it will always have some reactants and some products that remain the same. (CO2, H2O)

Mitchell Koss 4G

Equations will be given on any test. Although the traditional Rydberg equation may not be, but Dr. Lavelle’s preferred Rydberg equ is.

Mitchell Koss 4G

Most effective studying is done over many weeks, not pulling an all night session

Mitchell Koss 4G

Dr. Lavelle is also covering midterm material in class today

Mitchell Koss 4G

There is also the delta positive and delta negative symbols

Mitchell Koss 4G

Don’t forget that not all of outline 3 material is on the midterm.

Mitchell Koss 4G

You can go to the AAP office and ask if any are available

Mitchell Koss 4G

The textbook store is also offering exchanges of the Sapling online pass as there are some issues with accessing the course but the last day to do so is today.

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