CHEMISTRY COMMUNITY

Destiny Diaz 4D

I believe Lavelle once said in class before a test or the midterm to assume all gases are monoatomic unless told otherwise, is this still true for the final ?

Destiny Diaz 4D

I think the only case you would multiply it by something is when you want to flip the reaction so you would multiply the cell potential by negative 1.

Destiny Diaz 4D

so the overall rate law is dependent on its slowest step, so it is always going to be the determinate in the overall rate. To help remember this, I relate this to the quote "you are only as strong as your weakest link" meaning the reaction is only as fast as its slowest step.

Destiny Diaz 4D

As long as you understand that collision is necessary for reactions to continue, molecules need to break apart and form and with and increase in temperature this will happen more I think you should be okay.

Destiny Diaz 4D

I feel like the final will include questions that involve PH but are not specifically only PH questions, they will be a combination of multiple topics similar to #5 on test 2

Destiny Diaz 4D

How would you go about this problem I had some trouble understanding it

Destiny Diaz 4D

depending on if the reaction is endo or exothermic, it will change the way the reaction proceeds and which direction is most favorable.

Destiny Diaz 4D

the mistake is more likely in your unit conversions, I would just double check those.

Destiny Diaz 4D

The catalyst is used up first then later recreated while an intermediate is first created/produced then used up and not in the final product and this is how you would tell the difference I think.

Destiny Diaz 4D

The units of k will change depending on the order of the reaction so it is important to know which order your reaction is to have the correct units

Destiny Diaz 4D

as long as your conversions are correct and you give the answer in the correct units (if explicitly asked) then that is the only time it really matters

Destiny Diaz 4D

why is it important to know which step is the slower or the faster one? is it just to ensure that the k values are correct and accurate ?

Destiny Diaz 4D

I feel like as long you understand and can picture the situation when given an adsorption problem you shouldn't have to worry too much.

Destiny Diaz 4D

I think it would matter only in understanding what is happening to the reactant, it would be steeping into the catalyst instead of the catalyst taking in the reactant? I am not sure though

Destiny Diaz 4D

An intermediate is part of the elementary steps of a rxn, meaning it is part of the reactions of a part of the reaction then cancelled/used up in the following step and is not seen in the final overall reaction

Destiny Diaz 4D

the way I think of this, just to be quick is the higher the temp. the more collisions within the reaction meaning it will react at a faster rate. so the statement is true in this context

Destiny Diaz 4D

Destiny Diaz 4D wrote:would we be specifically asked to solve using the pre equilibrium approach?

I feel like based on the question and what is given you would determine this, but I wanted to ask to be sure?

Destiny Diaz 4D

would we be specifically asked to solve using the pre equilibrium approach?

Destiny Diaz 4D

I think as long as you know where the equations come from and how they are related you should be good.

Destiny Diaz 4D

I wouldn't say you need to know how to do integrals and derivatives but just understanding how these equations derive would be helpful

Destiny Diaz 4D

LeannaPhan14BDis1D wrote:
Destiny Diaz 4D wrote:so to find delta n you would take the moles from products subtracted from moles from reactants?

yes i think so?

I think that makes sense lol thank you

Destiny Diaz 4D

There might be questions that ask to derive 3+ order equations but I doubt we will be asked to do much with them at all.

Destiny Diaz 4D

The half life equation for a zero order reaction is [A0]/2k

Destiny Diaz 4D

I am not sure if this chart is helpful to you but here it is just in case

Destiny Diaz 4D

Here is a chart that helps understand the relationship

Destiny Diaz 4D

Spontaneity is dependent on delta S and delta H so you cant assume the rxn is spontaneous

Destiny Diaz 4D

so to find delta n you would take the moles from products subtracted from moles from reactants?

Destiny Diaz 4D

Will we normally be given the pressure of an isobaric reaction in atm ? or will we need to be able to convert?

Destiny Diaz 4D

When enthalpy is given I would not say it is safe to assume that pressure is constant, unless other wise stated.

Destiny Diaz 4D

Thank you :)

Destiny Diaz 4D

Does anyone know where the keys to test 1-3 can be found if they are available? I reviewing and would like they keys for reference

Destiny Diaz 4D

Thank you for your help ! When will the answers be posted ? :)

Destiny Diaz 4D

How would you find the dipoles in this case ?

Destiny Diaz 4D

I am wondering why in the lewis structures for a) OSbCl3 and b) SO2CL2 the answer key shows O as not having a double bond with their central atoms, essentially with or without the double bond the shapes are still tetrahedral but I am curious why the lewis structures are written this way when a doubl...

Destiny Diaz 4D

I am not exactly sure how the repulsion would impact the bond length, for general understanding though the electrons are negatively charged therefore need to be as far away from each other and if it is a lone pair they have a stronger repulsion changing the shape of the molecule.

Destiny Diaz 4D

I was also confused on the concept of unhybridized orbitals, I am wondering if the hybridization changed the shape of the molecule? Or would it only be impacting the sp formula and if so how?

Destiny Diaz 4D

Please read things carefully. The solution manual says the shape is a tetrahedral about the carbon atoms . However, as a whole, the molecule is linear. Meaning with respect to the central Be atom in (CH 3 ) 2 Be. So to better understand, if the question were to ask of the shape in respect to the ca...

Destiny Diaz 4D

Niveda_B_3I wrote:Also, it's good to know that:

single bond - one sigma
double bond - one sigma, one pi
triple bond - one sigma, two pi

etc.

I am not sure if this question makes sense but are the sigma and pi bonds correlated to the type of bond like covalent or ionic bonds?

Destiny Diaz 4D

Destiny Diaz 4D wrote:I understood the shape to be angular from the solutions but I don't understand why.

I believe that because the steric number is four and since there are two lone pairs then the shape is angular but I still am slightly confused.

Destiny Diaz 4D

I understood the shape to be angular from the solutions but I don't understand why.

Destiny Diaz 4D

can you explain this in terms of the homework problem 4.1, I am still somewhat confused as to why the bond must have lone pairs.

Destiny Diaz 4D

Yes, mentioning stable structure and formal charge (how it equals to 0) would be the correct answer for the reasoning. If the formal charge doesn't equal 0, then it probably wouldn't be the correct element. I agree, I think as long as you support your answer scientifically with the formal charge an...

Destiny Diaz 4D

Yes, mentioning stable structure and formal charge (how it equals to 0) would be the correct answer for the reasoning. If the formal charge doesn't equal 0, then it probably wouldn't be the correct element. I agree, I think as long as you support your answer scientifically with the formal charge an...

Destiny Diaz 4D

Destiny Diaz 4D wrote:How would you determine if all the bond lengths in a structure are the same?

or does that depend on the type of bond ?

Destiny Diaz 4D

How would you determine if all the bond lengths in a structure are the same?

Destiny Diaz 4D

Your work is correct from my understanding, I also got two unpaired electrons for this problem.

Destiny Diaz 4D

jguiman4H wrote:Essentially, your set up would look like this: E = (5.00 x 10^-3 g Na) (1 mol Na / 22.99 g Na) (6.022 x 10²³ atoms/mol) (3.37 x 10^-19 J/atom) = 44.1 J

The 3.37 x 10^-19 J/atom comes from your answer in part a. Hope this helps!

Yes thank you <3

Destiny Diaz 4D

I followed the process suggested and am not getting the answer offered in the solutions from the book, my answer is off by a few decimal points and was wondering if you could break down the process a bit more just so I can understand conceptually. Thank you so much <3

Destiny Diaz 4D

My TA basically went over a lot of what is covered in chapter one, stating that that is what the test will be on mainly. which was concepts of wavelength, frequency, energy, the photoelectric effect, and quantum numbers. I think if you review these concepts and their equations you should be okay for...

Destiny Diaz 4D

I'm curious to know how the black body radiation helps to understand the properties of the electromagnetic radiation, I understand what it is but don't know how to support the properties of the radiation through this.

Destiny Diaz 4D

For the first test, are we expected to memorizes things like Avogrados Constant or will they be given?

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