CHEMISTRY COMMUNITY

JohannaPerezH2F

good luck on finals yall

JohannaPerezH2F

the curve is going to be lowered because the activation energy will be lowered

JohannaPerezH2F

CUTEEEEEE

JohannaPerezH2F

it is used to calculate k at different temperatures

JohannaPerezH2F

Can someone share if we got a review packet??

JohannaPerezH2F

The Arrhenius equation can be used to determine the effect of a change of temperature on the rate constant, and consequently on the rate of the reaction. If the rate constant doubles, for example, so does the rate of the reaction

JohannaPerezH2F

youll get them this week during discussion

JohannaPerezH2F

you should go through topics on your own and maybe to optimize your time to attend the workshops of topics you don't understand that much and the ones you do skip out unless you have the time. Also, on Thursday from 6-9pm they are covering all topics I think so that should be good.

JohannaPerezH2F

i think the test is 8 questions or around that. He'll usually at least include one question for it or it'll be included in like parts of whole questions

JohannaPerezH2F

yes it would be in the zeroth order

JohannaPerezH2F

unfortunately, I doubt they will make the test take home, but on the website, you can find your location

JohannaPerezH2F

khan academy, they have an app also

JohannaPerezH2F

So im studying for the test/final and i came upon a slight confusion. For the Hoff equation, I have two slightly different ones. One of which my TA provided for me and other is from the textbook. The textbook reads lnK2/k1=change in H/R(1/t1-1/t2) and the one my ta derived is lnk2/k1=change in H/R(1...

JohannaPerezH2F

- Balance elements in the equation other than O and H. - Balance the oxygen atoms by adding the appropriate number of water (H2O) molecules to the opposite side of the equation. - Balance the hydrogen atoms (including those added in step 2 to balance the oxygen atom) by adding H+ ions to the opposit...

JohannaPerezH2F

"Pt is added to any side that lacks a solid conductor. Eg. if one half-reaction consists only of aqueous species, then that sides needs Pt(s) The half-reaction of I2(s) / I- (aq) requires Pt(s) because I2(s) is a non-conducting solid The exception to this rule is the mercury Hg(l) which can ser...

JohannaPerezH2F

Elizabeth Bowen 1J wrote:
Eunice Nguyen 4I wrote:I was always told to follow (s)|(g)|(aq)||(aq)|(g)|(s). Aqueous in the middle separated by two || (salt bridge), and the solids on the outside.

Does anyone know what we would do if there's a liquid?

Yea if someone could help answer this, it would be great

JohannaPerezH2F

i also think its joules per mole, but when doing the calculations you'll be able to confirm

JohannaPerezH2F

you can combine them because K is unit less

JohannaPerezH2F

The initial rate of a reaction is the instantaneous rate at the start of the reaction (when t = 0). The initial rate is equal to the negative of the slope of the curve of reactant concentration versus time at t = 0.; Measuring the initial rate of a reaction is important, because you know the concent...

JohannaPerezH2F

The electromotive force is the total voltage induce by the source. In other words, it is the amount of energy supplied by the source to each coulomb of charge. It is measured in volts and represented by the symbol ε (epsilon). The emf is the maximum voltage that can be attained by the circuit.; The ...

JohannaPerezH2F

An ion-selective electrode (ISE), also known as a specific ion electrode (SIE), is a transducer (or sensor) that converts the activity of a specific ion dissolved in a solution into an electrical potential. The voltage is theoretically dependent on the logarithm of the ionic activity, according to t...

JohannaPerezH2F

Pt is added to any side that lacks a solid conductor.

JohannaPerezH2F

The oxidation number of a free element is always 0. The oxidation number of a monatomic ion equals the charge of the ion. The oxidation number of H is +1, but it is -1 in when combined with less electronegative elements. The oxidation number of O in compounds is usually -2, but it is -1 in peroxides...

JohannaPerezH2F

i think it would be between k>10^-3 and k<10^3 but idk exactly what you're asking.

JohannaPerezH2F

The Nernst Equation is derived from the Gibbs free energy under standard conditions.

JohannaPerezH2F

A metal will dissolve in the solution if the standard cell potential of the redox reaction is positive, meaning the standard Gibbs free energy is negative because that would mean the reaction is spontaneous.

JohannaPerezH2F

E = cell potential at standard-state conditions.
R = ideal gas constant = 8.314 J/mol-K.
T = temperature (kelvin), which is generally 25 C (298 K)
n = number of moles of electrons transferred in the balanced equation.
F = Faraday's constant, the charge on a mole of electrons = 95,484.56 C/mol.

JohannaPerezH2F

A concentration cell is a type of a galvanic cell where the same type of a solution is used for the two compartments (cathode and anode) with the only difference is the concentration.

JohannaPerezH2F

you don't need to memorize any equations bc they're mainly given but how they are applied to the concept, you'll need to understand that

JohannaPerezH2F

unfortunately, de does not post his slides, he does have equilibrium modules

JohannaPerezH2F

enthalpy is a state function because it only depends on the initial and final conditions, and not on the path taken to establish these conditions

JohannaPerezH2F

enthalpy is a state function because it only depends on the initial and final conditions, and not on the path taken to establish these conditions

JohannaPerezH2F

i think you can pick them up anytime this week from 9-5 pm and they're closed for lunch from 12-1pm

JohannaPerezH2F

yes, hw from the thermochemistry outline should be fine

JohannaPerezH2F

in 14a we would get some partial credit, but it depends on your grader

JohannaPerezH2F

the best way to study i have found is to do all the hw problems and to go over the learning objectives. Also, go through your notes, but definitely apply the concepts to problems.

JohannaPerezH2F

yes you don't include water but also don't include other liquids and solids, just gases.

JohannaPerezH2F

this rule is used to calculate how accurate your approximation for x is. if it is less than 5% you're good

JohannaPerezH2F

you can ignore x when making an approximation. this can be done when Kb or Ka is less than 10^-3

JohannaPerezH2F

the values will be given, we just need to know how to interpret and apply

JohannaPerezH2F

the reaction does not shift (concentration does not change) with an inert gas because in order to do so we would need volume to change.

JohannaPerezH2F

this is the ideal gas law and you can use it to convert between partial pressure and concentration. concentration=P/RT

JohannaPerezH2F

in basic terms, le chanteliers principle just demonstrates how a system will always reach stability but more complex "Le Chatelier's principle can be used to predict the behavior of a system due to changes in pressure, temperature, or concentration. Le Chatelier's principle implies that the add...

JohannaPerezH2F

you can pick them up week 3 from 3034 Young Hall

JohannaPerezH2F

you can pick them up week 3 from 3034 Young Hall

JohannaPerezH2F

I also have this question, so I'm just dropping a comment to be able to access it once someone replies

JohannaPerezH2F

R is the gas constant and it equals 8.314 J / mol·K.

JohannaPerezH2F

I think Test 1 is only on outline 1 which would be chemical equilibrium but he'll probably clarify this by the end of this week

JohannaPerezH2F

we use Kc or Kp according to the the information we are given and the values we are looking for. for example we would use Kp when atm is used and Kc when moles/liter are used

JohannaPerezH2F

i think this might depend on your ta, but for some, it mostly based on completeness of the 5 problems.

JohannaPerezH2F

according to the video module, we can assume K is small when it is approximate 10^-4 or smaller

JohannaPerezH2F

Yes, he said week 1 that we can still turn in equilibrium hw problems for week 2 hw.

JohannaPerezH2F

Hi, I was unable to make it to lecture, can someone let me know what Lavelle went over please and thank you!

JohannaPerezH2F

I'm not sure if he will, but I know Friday 7:30-10 there will be a review session which will cover everything

JohannaPerezH2F

In both acid the oxidation number of chlorine and bromine are same ,that is +3 . But chlorine atom is more electronegative than bromine atom . So the electron of O - H bond strongly attract Cl atom towards itself than bromine atom . ... Consequently , HClO2 is more stroger acid than HBrO2

JohannaPerezH2F

yes, to receive a C- we just need a total of 250 points

JohannaPerezH2F

You will go according to your last name but we'll probably receive an email with a confirmation

JohannaPerezH2F

I just checked chemistry community but they are not up yet, he said they ould be up very soon. I believe the first one begins on Tuesday

JohannaPerezH2F

This also happen to me a lot. I usually sit and take a deep breathe and really tell myself that I know what I'm doing. By giving myself reassurance I'm able to more easily focus on the problems

JohannaPerezH2F

I would say that Friday will be review

JohannaPerezH2F

To determine whether a substance is an acid or a base, count the hydrogens on each substance before and after the reaction. If the number of hydrogens has decreased that substance is the acid (donates hydrogen ions). If the number of hydrogens has increased that substance is the base (accepts hydrog...

JohannaPerezH2F

sigma bonds will be stronger since its an overlap

JohannaPerezH2F

I got this online and hope it answers your question. "Cisplatin molecules are known to be attacked by water molecules before they react with DNA. ... 3) When cis-form of (NH3)2 Pt 2+ reacts with two Guanines in DNA, the two N atoms in Guanines can readily bind to the Pt atom in cisplatin. The t...

JohannaPerezH2F

I got this from online and thought it was a good explanation. "A chelate is a chemical compound composed of a metal ion and a chelating agent. A chelating agent is a substance whose molecules can form several bonds to a single metal ion. In other words, a chelating agent is a multidentate ligan...

JohannaPerezH2F

yes, and it would by looking at where the isomer is. the isomer where the two methyl groups are on the same side of the double bond is called “cis”, and the isomer where the two methyl groups are on the opposite side is called “trans”.

JohannaPerezH2F

I would do week 9 based on hybridization and prolly the coordination and compound one

JohannaPerezH2F

Hybridization is based on the mixing of orbitals of the atom(any) to give hybrid orbitals. Hybrid orbitals can overlap with the hybrid/pure orbitals of other atoms to give sigma bonds

JohannaPerezH2F

you should focus on intermolecular forces, vsper model, hydrogen bonding dipoles and whatever he'll add Monday

JohannaPerezH2F

I go over one for a while and then do something random and then go back and see if I can remember without looking at something

JohannaPerezH2F

it's not on a curve but if in total points you accumulate 250 points or more then you have a passing grade

JohannaPerezH2F

you should focus on intermolecular forces, vsper model, hydrogen bonding dipoles and whatever he'll add Monday

JohannaPerezH2F

you would know this because the electronegativity difference is greater than Ba and Br than between B and Be and Br making the Ba-Br bond more ionic

JohannaPerezH2F

so you would draw the structure with n in the center and surround with 2 o's and one cl and one o will have two bonds and the other two just one bond with N

JohannaPerezH2F

I feel like focus more of your time on quantum

JohannaPerezH2F

my ta said that if you just write the answer then thats fine but they give partial points so if you don't know something you can write random equations to get some credit

JohannaPerezH2F

the octet rule is strictly followed by B row and as you go down not that much, an example would be PBr5

JohannaPerezH2F

yea, i think you'll just have to draw one with the correct charge since you can rotate the bonds

JohannaPerezH2F

Can someone confirm that the midterm is Nov 6 and what time and place is takes? Or where can I access this information

JohannaPerezH2F

I've also been struggling a lot with keeping up with the material, so if anyone wants to study together and prepare lemme know but I think something that is definitely important is to prepare before the week starts

JohannaPerezH2F

The units for hertz is one cycle per second

JohannaPerezH2F

p^3->s^2->cl^-

JohannaPerezH2F

a)4p
b)4s
c)6s

JohannaPerezH2F

Hi can someone further explain the difference between psi and psi^2?

JohannaPerezH2F

so C would be interpreted as the following

because the electrical field corresponds to the amplitude; and so as the frequency decreases the waves broaden and the extent of the change decreases.

JohannaPerezH2F

C is correct because the electrical field corresponds to the amplitude; and so as the frequency decreases the waves broaden and the extent of the change decreases.

JohannaPerezH2F

a) 5d, five
b)1s, one
c) 6f, seven
d) 2p, three

JohannaPerezH2F

In each of these series, the principal quantum number for the lower energy number involved is the same for each absorption line. Thus, for the Lyman series, the lower energy level is n=1; for the Balmer series n=2 for Paschen series n=3 and for the Brackett series n=4.

JohannaPerezH2F

We are allowed to combine equations when they are equal to each other. For example x=2 for x+2=? it would be 2+2=4 because we substitute the variable for the known. This also happens for the equation you listed. Hopefully, this is what you are referring to

JohannaPerezH2F

Usually to calm myself, I like to do something that is fun for me. Either that be I watch a show or go to the gym just to get a breather and forget about all the anxieties. Goodluck

JohannaPerezH2F

I might be completely wrong so anyone correct me if I'm wrong but it might be the number of isotopes that exists?

JohannaPerezH2F

I might be completely wrong so anyone correct me if I'm wrong but it might be the number of isotopes that exists?

JohannaPerezH2F

I'm not sure if I misinterpreted your post but for your explanation it would be that as frequency decreases then the waves broaden and the extent of the change decreases. This is because electric field corresponds to the amplitude

JohannaPerezH2F

Yes so afterwards what you would do is find the mass of water by subtracting 510g-27.8g= 482.2G H2O

and the way to describe it would be that you measure 482g H2O on a balance and then pour it in a beaker. Then you weigh 27.8g of KNO3 and mix it with water until it dissolves.

JohannaPerezH2F

I'm barley learning how to navigate Chemistry community so sorry if this post is not in the correct place buy anyways..

For the 50 min test will it take place during class (if so when) or during our discussion section??

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