CHEMISTRY COMMUNITY

Lily Anne Garcia 1C

Work is negative when the system is expanding and positive when its compressing

Lily Anne Garcia 1C

G is in in KJ same with H but S is in J/k or sometimes KJ/k
G is typically answered in kJ, and H is usually given in kJ. However, S is usually given in J/K instead of kJ/K, so be sure to convert the J to kJ before plugging it into the equation. Hope this helps!

Lily Anne Garcia 1C

heat can be added in a closed system but cant be in an isolated one

Lily Anne Garcia 1C

theyre the same you can use interchangeably

Lily Anne Garcia 1C

solids and liquids no aq and gas yes

Lily Anne Garcia 1C

temperature!!

Lily Anne Garcia 1C

theres a total of 400 points you can calculate how manhy points you can miss for the desired grade

Lily Anne Garcia 1C

8.314 is common for this unit

Lily Anne Garcia 1C

happy valentines day!

Lily Anne Garcia 1C

i was pleasantly surprised with the midterm. im glad we made it through the first one proud of you guys!

Lily Anne Garcia 1C

work is dependent on the path taken to obtain its current state

Lily Anne Garcia 1C

so proud of us!!

Lily Anne Garcia 1C

woohooo lets go guys!!!

Lily Anne Garcia 1C

because of how small K is, its less than 10^-4

Lily Anne Garcia 1C

i believe justin did for both midterms and the final last quarter

Lily Anne Garcia 1C

just do textbook problems!

Lily Anne Garcia 1C

c- = 50%

Lily Anne Garcia 1C

you can find it on the syllabus and exam schedule on his website

Lily Anne Garcia 1C

i am a little slow when it comes to test taking but i felt that i had enough time to finish. mayb enot look back over every single question but definitely get to the ones that i was unsure about

Lily Anne Garcia 1C

i would just get yourself comfortable with recognizing them not necessarily memorizing

Lily Anne Garcia 1C

no negative x values and if theyre both positive one will be bigger than the initial condition which isnt right

Lily Anne Garcia 1C

kc is for concentration while kp is for pressure

Lily Anne Garcia 1C

if youre adding a gas that isnt going to react with the already present gases then it wont do anything

Lily Anne Garcia 1C

do the textbook problems and attend step ups

Lily Anne Garcia 1C

it really depends on what the problem is asking you to do. You have to associate one of the three R constants with whatever equation youre using

Lily Anne Garcia 1C

i would encourage multi term, that way you can use it over several quarters for a more reasonable price

Lily Anne Garcia 1C

you only use partial pressures when solving for Kp meaning that they would be giving you pressures of the gases. If they give you concentrations, then you calculate Kc

Lily Anne Garcia 1C

pressure, volume, number of moles, constant, tempurature

Lily Anne Garcia 1C

basically k is the constant when the reaction is at equuilibrium, and you calculate q when either more reactants or products are added to the system.

Lily Anne Garcia 1C

sadly they are all pre recorded, you can attend his office hours live

Lily Anne Garcia 1C

Kc refers to concentration while Kp refers to pressure. You calculate either or depending on what values you were given in the problem.

Lily Anne Garcia 1C

sapling and chem community are the only mandatory graded assignments

Lily Anne Garcia 1C

Lily Anne Garcia 1C

K stays the same, but Q is what you calculate after more reactants are added

Lily Anne Garcia 1C

theyre not part of our grade, only for additional practice. i believe thyer only put up for the first section

Lily Anne Garcia 1C

sadly, no.

Lily Anne Garcia 1C

probably a mix of some we have seen and some new ones. same as the midterms.

Lily Anne Garcia 1C

this is great thank you so much

Lily Anne Garcia 1C

i think if youre going to ua sessions and do the textbook problems youll see everything you need to know

Lily Anne Garcia 1C

i set aside my phone and anything that would potentially distract me. Then i let myself work for a certain amount of time and give myself a little break afterwards. that way it is more manageable.

Lily Anne Garcia 1C

im okay as of now but stressing big time for the final

Lily Anne Garcia 1C

sunday night at 11:59

Lily Anne Garcia 1C

yeah theyre the same thing

Lily Anne Garcia 1C

Its important to get a lot o frest the night before. I also remind myself that at that moment, it is the most prepared i can be. stressing only creates anxiety for taking the test. just breathe :)

Lily Anne Garcia 1C

an element is more stable with a half full or full filled orbital shell

Lily Anne Garcia 1C

it always takes the electron from the orbital furthest away from the nucleus

Lily Anne Garcia 1C

yes it is thats why we had two separate midterms

Lily Anne Garcia 1C

After midterms, i love to watch netflix and sleep.

Lily Anne Garcia 1C

i think you just need an accumulative count of 50 posts by the end of the quarter

Lily Anne Garcia 1C

lavelle sent out an outline 3 page you can also find it on his website

Lily Anne Garcia 1C

you use brackets when the molecule has an overall neg or pos charge

Lily Anne Garcia 1C

they are the weakest because they only form temporary dipole attractions

Lily Anne Garcia 1C

the one with the formal charge closest to zero is the most plausible

Lily Anne Garcia 1C

I think there are a bunch more but we wont cover them

Lily Anne Garcia 1C

Khan Academy works wonders!

Lily Anne Garcia 1C

Yes I would love that even for next midterm!!

Lily Anne Garcia 1C

Dont even worry, Im sure you did great. We can always do better on the next one!

Lily Anne Garcia 1C

Use wavelength=h/mv but make sure the mass is its diatomic weight (x2) and divided by avogadros number

Lily Anne Garcia 1C

305572629 wrote:Does anyone know if the next midterm and final exam will be multiple choice?

I think they would be multiple choice if we take them online but Im not completely sure no info has come out yet

Lily Anne Garcia 1C

Violet light is in the Balmer series meaning n1=2. Calculate frequency using wavelength value. Then use frequency value in rydberg equation to calculate n2

Lily Anne Garcia 1C

Ah sorry to say I wasn't having this problem. Maybe you inputed incorrect values?

Lily Anne Garcia 1C

Hi! 4s is filled first and has lower energy

Lily Anne Garcia 1C

To avoid round off error, use the whole number until your very last calculation. If you need to write down numbers for problems with multiple steps, you can round them on paper, but keep the entire number on your calculator so you can produce a more accurate answer at the end.

Lily Anne Garcia 1C

I think they are all still shuffled but everyone has the same order. Someone informed me that problems 1-10,12,14,19,22-27 are the ones to focus on.

Lily Anne Garcia 1C

Hey Nicolette, I'm also a freshman this year. One thing I have been doing to study is looking through his outlines and modules. While the lectures are very informative, these additional resources on his website allow for extra practice and explanations. At the end of the day, repetition is what help...

Lily Anne Garcia 1C

To answer the first part of your question, the electrons they describe have different probability distributions around the nucleus. This means that the electrons can be found in a variety of different region which leads to forces with different strengths.

Lily Anne Garcia 1C

I love watching Netflix. Tiktok keeps me very entertained as well.

Lily Anne Garcia 1C

I was confused with this too, we asked our TA during discussion and he said he was okay with us having extra scratch paper out. I would definitely email yours just to be sure.

Lily Anne Garcia 1C

Hi this is a very interesting question actually. To be honest, Im not completely sure but I would assume that it is just a very very low number. As you get closer it just approaches zero but never actually reaches it.

Lily Anne Garcia 1C

Basically, you want to use the same amount of sigfigs as the value given in the problem with the least amount. If the given values were .0078, 5.076, and .72635, your answer should only contain 2 sigfigs. I'm not too sure if we will get penalized for using the wrong amount of sig figs, but I would a...

Lily Anne Garcia 1C

HI! As stated above, we will only be covering week 1-3 content. Dr. Lavelle explained in a recent email that he would never make a test covering content we were learning in that current week. Hope this helped!!

Lily Anne Garcia 1C

Hi! Each photon must have sufficient energy to overcome the energy of an electron. Increasing the intensity only adds more photons, but doesn't change the amount of energy each photon has. That is why a higher frequency is needed in order to eject electrons and wavelength doesn't have much of an aff...

Lily Anne Garcia 1C

Hi! I am not 100% positive, but I believe this answer is based solely off of logic. Nothing can possibly move faster than the speed of light.

Lily Anne Garcia 1C

Hi! Professor informed us that we will be given a formula sheet and will not have to memorize equations. He believes it is more important to understand the concepts during the problem solving process.

Lily Anne Garcia 1C

Hi! So, basically when on Respondus you are unable to exit that browser. This means that when you get to the zoom link, you have to deny the popup that says "open zoom app?" Instead, try clicking on the option down below written in blue that says "open zoom on browser." This shou...

Lily Anne Garcia 1C

As of now, I don't think you have to worry about writing the phases. That is not a topic we have covered yet and professor said that we would go into detail about it sometime in the future. If it makes you feel any better, I have never seen it after a molar concentration value either!

Lily Anne Garcia 1C

Yes! Basically, you want to use the same amount of sigfigs as the value given in the problem with the least amount. If the given values were .0062, 5.098, and .76345, your answer should only contain 2 sigfigs. Hope this helped

Lily Anne Garcia 1C

After calculating the empirical formula, you can use the periodic table to calculate its mass. If the directions are telling you to find the molecular formula, they should have given you a mass for that compound. If you divide the mass of the molecular formula by the mass of the empirical formula an...

Lily Anne Garcia 1C

Im not positive that this is correct, but if I were to approach this problem I would multiply 6.022x10^23 by twice the length of the radius. I believe that would give the length of the nanotube. Hope I could help.

Lily Anne Garcia 1C

I usually use the entire value that's given on the periodic table. This is so that I can get a more accurate answer, avoiding round-off error. Once your final value is calculated you can adjust the answer to the amount of sig figs for that specific problem.

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