CHEMISTRY COMMUNITY

Nina Fukui 2J

I just feel relieved :)
I feel proud of myself for finishing my first every chemistry course (14a and 14b) during such times

Nina Fukui 2J

Cindy Adiwidjaja 1B wrote:I liked chemical equilibrium because it was so easy. However, conceptually, I found galvanic cells to be really cool. Did I know how to solve them? No. But did I think they were interesting? Yes.

Haha definitely relatable

Nina Fukui 2J

be careful with daylight saving time though!!

Nina Fukui 2J

thanks!

Nina Fukui 2J

What are the specific conditions to add Pt(s) at the end of a cell diagram?

Nina Fukui 2J

why is the KOH added in the cell diagram?

Nina Fukui 2J

How do I solve this question? When I compare my answers with the solutions manual it seems like I'm not reading the phase boundaries ( | , ||, etc. ) correctly and secondly since its just H+ and OH- and water, the procedure seems different compared to the other galvanic cell questions.

Nina Fukui 2J

I liked Acids and Bases

Nina Fukui 2J

Did worse on MT2 than MT1 terrified for the final

Nina Fukui 2J

Pretty sure we follow Dr. Lavelle's website and it says Sunday 3/14 at 0930-1100

Nina Fukui 2J

Definitely feeling a little burned out. Can't wait for the final to be over.

Nina Fukui 2J

rate changes with temperature change

Nina Fukui 2J

I'm taking orgchem (chem 30a), gender studies 10, eng comp 3, and lifesci 7b!

Nina Fukui 2J

For me, I try to do ALL of the textbook questions and read over my notes a couple of times. This prepares me for the calculations and the conceptual questions

Nina Fukui 2J

I just forget about it hope for the best. In the meantime, I catch up on some TV shows that I couldn't watch because of my cram sesh or do something fun!

Nina Fukui 2J

But for a more serious one I liked Never Let Me Go by Kazuo Ishiguro

Nina Fukui 2J

If you wanna see how bad the book to movie adaptation is for TATBILB you could read the series :D

Nina Fukui 2J

E cell naught is for under standard conditions
Ecell changes as the current flows

Nina Fukui 2J

Cp is for when the pressure is constant and Cv is for when the volume is constant. They're usually given and if the question mentions that the gas is ideal, then the values can be found on the formula sheet

Nina Fukui 2J

George Kaleb Jimenez 1K wrote:I dont know about yall but after that midterm I am going to watch WandaVision and eat to my heart's content <3
How do yall plan on destressing this weekend?? :3

same! I just watched the newest episode and I was shocked.

Nina Fukui 2J

I believe state functions depend on only final and initial states so free enrgy would match that definition. Whereas other functions like work and heat do depend on the process it took to get to the final state.

Nina Fukui 2J

The entropy of the universe is always positive. I think that's what you're talking about

Nina Fukui 2J

200 points is equal to a 50% which is said to be a C- (pass) for this class

Nina Fukui 2J

Entropy is the measure of disorder in the world. Depending on the letters next to the "S" it could mean for the system, world etc

Nina Fukui 2J

Although Valentines ended for me already (timezone), happy Valentines everybody!

Nina Fukui 2J

They are both on the formula sheet and you have to be careful with the different units you're dealing with in your equations. One has J*K^-1*mol^-1 while the other has L*atm*K^-1

Nina Fukui 2J

Delta G is the change in free energy of a reaction while delta G ° is the change in free energy of a reaction under standard conditions!

Nina Fukui 2J

all these jokes make me enjoy chemistry a little bit more every week. just wanted to say thank you to everyone

Nina Fukui 2J

I have this problem too. To try and fix this (at least during exams), I use the remaining time I have to redo every question again or even twice to make sure I am not making any careless mistakes. And when doing so, I do the whole problem on a new piece of paper so I don't get influenced by my previ...

Nina Fukui 2J

during the phase change, as the particles start increasing in energy they move or vibrate and as they move into their vapor state, they need to move more freely and not be as close to each other. These bonds do not have the highest bond energies but also are not too weak either. Due to the breaking ...

Nina Fukui 2J

I saw that Cp=Cv+R while trying to solve a sapling problem. How is this so?

Nina Fukui 2J

It depends on where the work is being applied. For example, if work is done on a system, there will be a negative sign, while on the other hand, if work is done by the system it is positive

Nina Fukui 2J

Hey I work less hours than you do but I do admit it is still hard to manage the two and maintaining grades. I feel like I lose time for self-care and stress myself out a bit too much. I try to manage it by just taking a break and dropping everything when I need to. I'll spend a whole day watching Ne...

Nina Fukui 2J

I use 10^-4

Nina Fukui 2J

What are the differences between the two???
percent protonation/deprotonation

Nina Fukui 2J

Noble gasses have no effect on the equilibrium of the reaction!!!

Nina Fukui 2J

For this chart, for row one, when I try to calculate the pOH from pH, the pOH value becomes negative. Am I supposed to calculate it another way?

Nina Fukui 2J

Hi guys,

What lecture did we learn how to calculate these types of questions? I found them pretty early on in sapling so
q=mCdeltaT

Nina Fukui 2J

How do I know if a salt is acidic or basic?

Nina Fukui 2J

Just for clarification:
Percentage ionization is used for acids (with Ka) and percentage protonation is used for bases (Kb)?

Nina Fukui 2J

On one of week 2's sapling questions, it said to calculate the value of percentage protonated, and when it gave me more hints on how to solve the question it said to use the value of Bformal. What is Bformal??

Nina Fukui 2J

When filling the "C" row for ICE tables, the values of the X's etc are only determined by the stoichiometric coefficients? or does it have to do with the molarity?

Nina Fukui 2J

I always complete all of the assigned textbook questions and go over the solutions manual to figure out what i got wrong or take notes on the correct way to solve the question!

Nina Fukui 2J

Massimo_Capozza_1G wrote:So all we have to know this quarter is Ideal gases and their laws?

according to the syllabus for this unit yes.

Nina Fukui 2J

only included when water is in its gas state!

Nina Fukui 2J

they're both the same calculation method but the letter q usually means the solution isn't at equilibrium. but eventually q should reach k after a certain period of time

Nina Fukui 2J

Kp is used when partial pressures are given and Kc is used when concentrations are given but they both are equilibrium constants!

Nina Fukui 2J

Why does the solutions manual not multiply the mol values by 2 when the vessel is said to be half of a liter? shouldn't they multiply the mol amounts by 2 to get them at a mol per liter concentration? Q: A reaction vessel of volume 0.500 L at 700. K contains 1.20 mmol SO2(g), 0.50 mmol O2(g), and 0....

Nina Fukui 2J

Why is it that a change in pressure causes an increase in concentration?

Nina Fukui 2J

How do I convert from Kc to Kp?

Nina Fukui 2J

to be more productive :)

Nina Fukui 2J

P=pressure
V=volume of gas
n= number of moles
R= universal gas constant
T= temperature

Nina Fukui 2J

Hey guys, I was just wondering when do we include H2O in the ice table???

Nina Fukui 2J

I take a long bath and drink some warm tea :)))

Nina Fukui 2J

How do I solve this?

Nina Fukui 2J

Do I have to draw the lewis structure to know if a compound is amphoteric or not?

Nina Fukui 2J

Is it just supposed to be known that Fe or Iron is spelled out as ferrate in coordination compounds or is there a condition for it??

Nina Fukui 2J

From what I tried figuring out, I got this as my answer but its saying I'm incorrect. I thought I got all the strong acids and strong bases but if not, can someone explain whats wrong?

Nina Fukui 2J

for question c, how do I name [CO(CN)5(OH2)]2-

Nina Fukui 2J

Why is I3- linear?

Nina Fukui 2J

What is the hybridization of a pi bond?

Nina Fukui 2J

I know Pi bonds appear when there's a double or triple bond but is there a specific way to label which is which? or do we just need to know that pi bonds appear in certain conditions?

Nina Fukui 2J

How do I determine the number that goes after the metal of a compound? Eg. cobalt(II)

Nina Fukui 2J

Could someone explain what the (en) means in Cd(en)Br2] ? Found it on Sapling.

Nina Fukui 2J

[Co(NH3)5Cl]Cl2 To name this compound, I took the ligand ammonia and there are 5 of them so I named this part as pentaammine, then saw that there are 3 chlorines so trichloro, and lastly the metal is cobalt, so I thought the systematic name would be Pentaamminetrichlorocobalt(III). But this seems to...

Nina Fukui 2J

Hi,
On sapling I had a question about bond and molecule polarity but from this I was wondering, what would an example of a nonpolar bond be?

Nina Fukui 2J

Hi everyone,

# of regions of electron density=hybridization?

Nina Fukui 2J

What are factors that contribute to whether a molecule's polar or not? is it just the lone pairs?

Nina Fukui 2J

Are there any other factors used to determine bond angles other than geometrical shape and lone pairs? I'm having a hard time gettinh the sapling questions right.

Nina Fukui 2J

Hi everyone,
I was wondering if anyone relies on the textbook more to learn content rather than the lectures. Since the lectures are recorded, it's sometimes really hard for me to get them going especially as an international student with time difference. If so, any tips?

Nina Fukui 2J

Hi everyone, I've been trying to figure this question out and with the molar masses and composition I've concluded that it's methanol and I drew the lewis structure as can be seen in the attached image. But sapling says it's incorrect. I was wondering what I am doing wrong. An organic compound that ...

Nina Fukui 2J

Hi everyone,
What does isoelectronic mean?

Nina Fukui 2J

For part c, how do I know which atoms bond with others? Do the parentheses help? Draw the complete Lewis structure for each of the following compounds: (a) formaldehyde, HCHO, which as its aqueous solution, “formalin,” is used to preserve biological specimens; (b) methanol, CH3OH, the toxic compound...

Nina Fukui 2J

Hi everyone,
quick question:
Why is silver's electron configuration [Kr] 5s1, 4d10? By the usual order it would be [Kr] 5s2, 4d9

Nina Fukui 2J

1.13 Ionization energies usually increase on going from left to right across the periodic table. The ionization energy for oxygen, however, is lower than that of either nitrogen or fluorine. Explain this anomaly. I've read explanations online but I don't really understand what they mean. Can someone...

Nina Fukui 2J

1F.3 Place the following ions in order of increasing ionic radius: S2-, Cl-, P3-.
How would I do this?

Nina Fukui 2J

Adding up all the formal charges on each atom in a lewis structure equals to the overall charge? the one that's on the [ ]*
(the asterisk)

Nina Fukui 2J

Hi everyone. I heard from my TA that we won't be receiving periodic tables with values of electronegativity for the midterm. From the fact that whether a bond is ionic or covalent comes from the electronegativity difference, what exactly should I be able to understand or do for the midterm in terms ...

Nina Fukui 2J

Hi everyone.
Has it been confirmed whether we need to remember DNA base pairs for the midterm? It was brought up as an example in some lectures so I was wondering.

Nina Fukui 2J

Hi everyone!
Is Friday's lecture included in the second midterm?

Nina Fukui 2J

I'm trying to figure out the resonance structures for a carbamate ion. Can someone tell me what I am doing wrong??

Nina Fukui 2J

What exactly do Px, Py, and Pz represent? I wrote them down from a lecture for the magnetic quantum number but I don't really know what they mean

Nina Fukui 2J

Also, what exactly does it mean when it says "Phosphorus is able to access 3d orbitals for bonding and, therefore, is not constrained by the octet rule."??

Nina Fukui 2J

Hi everyone
How do I find the lewis structure for the phosphate ion?

Nina Fukui 2J

Can someone explain what electron affinity is? I'm still having a hard time understanding it...

Nina Fukui 2J

Hi everyone I havent taken chemistry since freshman year in high school and this sapling question asked for the Lewis structures for the nitrite ion and nitrate ion and it didn't give the chemical formula. Do I have to know the chemical formula for ions?? or any kind of compound?? or will they be gi...

Nina Fukui 2J

Hi everyone!
When I "draw" the structures on sapling and have to add charges (the plus and negative signs) to the atoms, does it matter which atoms I add them to?
For example
for CO3 2-, does it matter which O I put the negative charges on?

Nina Fukui 2J

Hi everyone,
I'm confused about how to identify the element. How do I do this?

Nina Fukui 2J

Hi everyone
How do I order Cs, Cs-, Cs+ in order from largest to smallest radius?

Nina Fukui 2J

Hi everyone! So anytime that the quantum numbers are specified up to the ml number, can I assume that the number of electrons in the atom is 2? because according to pauli's exclusion principle, there can be no more than 2 electrons in the same orbital. the question on sapling: How many electrons in ...

Nina Fukui 2J

Hi everyone! Could somebody help me with this question?

Q8. You have a metal, Rubidium, which has a work function of 2.3 eV. If the electrons being
ejected from the metal have a wavelength of 1.7 x 10^5 m, what is the wavelength of the incident
light?

Nina Fukui 2J

Hi! Could someone teach me how to do part b of this question? Arsenic is a toxic substance that can sometimes be found in groundwater. Arsenic has a molar mass of 74.922 g/mol. a) Calculate the molarity if 1.125 grams of arsenic are added to 235 mL of water. b) What volume (mL) of concentrated arsen...

Nina Fukui 2J

1A.5 Arrange the following types of photons of electromagnetic radiation in order of increasing energy: γ-rays, visible light, ultraviolet radiation, microwaves, x-rays.

Does this question mean we need to remember the whole EM spectrum? Just the order? or wavelengths, frequencies too

Nina Fukui 2J

Hi everyone! Can somebody explain part b for me? The velocity of an electron that is emitted from a metallic surface by a photon is 3.6×10^3km⋅s−1. (a) What is the wavelength of the ejected electron? (b) No electrons are emitted from the surface of the metal until the frequency of the radiation reac...

Nina Fukui 2J

Hi everyone! How do I solve this question? 1A.13 Use the Rydberg formula for atomic hydrogen to calculate the wavelength of radiation generated by the transition from n=2 to n=1. (b) What is the name given to the spectroscopic series to which this transition belongs? (c) Use Table 1A.1 to determine ...

Nina Fukui 2J

Hi everyone! Can someone go through this question step by step for me?

A baseball must weigh between 5.00 and 5.25 ounces (1 ounce=28.3 g). What is the wavelength of a 5.15-ounce baseball thrown at 92 mph?

Nina Fukui 2J

Hi everyone! In the solutions manual, I see a constant that looks like the Plancks constant with a bar through it. What does the h bar constant mean??

Nina Fukui 2J

Hi! After I figure out the wavelengths, how do I calculate the percentage of the wavelength of the neutron?? The solutions manual didn't explain this part and I was wondering if I did it correctly. Protons and neutrons have nearly the same mass. How different are their wavelengths? Calculate the wav...

Nina Fukui 2J

Hi! How do I solve this question?

A lamp rated at 32 W (1 W=1 J⋅s−1) emits violet light of wavelength 420 nm. How many photons of violet light can the lamp generate in 2.0 s? How many moles of photons are emitted in that time interval?

Nina Fukui 2J

Hi! How do I do the first part of the question? Use the Rydberg formula for atomic hydrogen to calculate the wavelength of radiation generated by the transition from n=2 to n=1. (b) What is the name given to the spectroscopic series to which this transition belongs? (c) Use Table 1A.1 to determine t...

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