CHEMISTRY COMMUNITY

Jasmine Salameh2K

Hello I think this is due to the fact that rate laws represent the beginning of a reaction prior to there being concentrations of the products

Jasmine Salameh2K

Hello, the equation that might be helpful is Ecell= Ereduced-Eoxidized

Jasmine Salameh2K

I was a little confused as to how we were able to manipulate the equation to all be over the initial concentration and why k was also multiplied by the initial concentration because when derived I don't recall the equation used for this problem to be formatted this way. Thank you

Jasmine Salameh2K

On the solution sheet it says we can disregard C because it is independent of the rate. Can someone please explain how we can exactly tell in more depth if a reactant is independent of rate? Thank you!

Jasmine Salameh2K

How would I go about solving for the K value on this question, where does the reverse reaction come into play? Thank you

Jasmine Salameh2K

I just went to a workshop and the host was saying that Dr. Lavelle tries to evenly weigh the topics on the final exam based on her experience with it, as far as the number of questions, I'm not too sure Dr. has disclosed this yet.

Jasmine Salameh2K

Hi Darcey! The electrodes don't need to be added into our cell diagram, since Cl2 is placed on the right we know this is our cathode (aka the reduced side) we know our reduction half reaction will be Cl2 +2e-->2Cl-

Jasmine Salameh2K

M.9 Use the data in Appendix 2B to calculate E°(U4+/U).

In the chart there is no exact equation for this specific redox, how do I manipulate the values.

Jasmine Salameh2K

How would I go about solving question #4 on week 7/8 achieve assignment. Just the way someone approached that number on their assignment thank you

Jasmine Salameh2K

How do I know if a solution is basic or acidic if it is not given to me

Jasmine Salameh2K

My approach for balancing in a basic solution is skipping the acidic step and going straight to adding H20 and OH-. If one side of my reaction is lacking Oxygen I add double, say, the left side is lacking 2 oxygen I will add 4OH- to that side, to the other side I will directly add half that I added ...

Jasmine Salameh2K

I believe when the conditions aren't standard you would use delta G= delta g standard + RTlnQ, partial pressure would be used to calculate Q

Jasmine Salameh2K

I believe the cathode is reduced while the anode is oxidized, it's just the difference between the two

Jasmine Salameh2K

I was wondering the same thing but to get it down and memorized I utilized pH and pOH, just to help me remember, hopefully it helps you too

Jasmine Salameh2K

What should I know about cathodes and anodes, what happens on both sides

Jasmine Salameh2K

Can someone explain how I'd go about finding oxidation numbers in a reaction.

Jasmine Salameh2K

Start with ideal gas law, Vf − Vi ΔnRT/p, and we substitute this into the first law equation simplify and divide by nΔT, we get by definition Cp=Cv+R, subtract cv and get the equation, I hope this helps

Jasmine Salameh2K

Hello Nima, there's different equations necessary for determining specific heat capacity under different systems

Jasmine Salameh2K

Can someone explain how a change in H and S will lead to spontaneity at all or certain temperatures?

Jasmine Salameh2K

Can someone please give me a full list of all the equations I need to know when approaching thermodynamics

Jasmine Salameh2K

On the syllabus I noticed it states that a 60% or higher is required to pass with a C-, is this true? If that's the case what's the benchmark of a B or an A, thank you?

Jasmine Salameh2K

Can someone walk me through how they went about solving this question? Thank you!

Jasmine Salameh2K

Can someone walk me through how they went about solving number 14 please. A sample of an ideal gas in a cylinder of volume 2.63 L at 298 K and 2.41 atm expands to 8.20 L by two different pathways. Path A is an isothermal, reversible expansion. Path B has two steps. In the first step, the gas is cool...

Jasmine Salameh2K

Can someone walk me through how they went about solving number 11 please, thank you ! A hot lump of 48.& g of iron at an initial temperature of 51.0 °C is placed in 50.0 ml. H, O initially at 25.0 °C and allowed to E reach thermal equilibrium. What is the final temperature of the iron and water,...

Jasmine Salameh2K

Can someone walk me through how they went about solving number 11 please, thank you !

Jasmine Salameh2K

When Isothermal: w=nRTlnvf/vi, q=nRTlnPi/Pf, when pressure is constant: w=PchangeV or nRchangeT, q=nCpchangeT, Volume constant: q=nCvchangeT, you decide based on what process, or whatever value is constant.

Jasmine Salameh2K

Can someone walk me through their calculations for number 19 on achieve, weeks 3 and 4?

Jasmine Salameh2K

For 18 I solved it a little differently, we start with Q=nCpchangeT, and we assume like the question states that Cp is equivalent to 4R so we plug that in, and multiply by mols and change in temp. Following this calculation we must find change in U and I found it easiest to solve for w using the eq ...

Jasmine Salameh2K

For this problem I used eq. 1 and 3 added a coefficient of 3 to third eq so multiplied the change in H by 3 as well and then summed 1 and 3 after these changes. Can someone tell me what I am doing wrong, thank you.

Jasmine Salameh2K

Hi Isaiah,
This is true, and when in the exothermic state we can see reactants at a higher energy level showing us that the products are more stable.

Jasmine Salameh2K

For me, converting first on problems like that lead me to the correct answer, so I'd recommend that.

Jasmine Salameh2K

can someone help me with a-c on this problem what they got, I don't know if my answers are correct. Thank you

Jasmine Salameh2K

could someone help me understand a-c on this problem I think a is the first one but I'm not sure.

Jasmine Salameh2K

I remember professor saying in class that if a ka or kb value given than that is a weak base or weak acid, he pretty much simplified it for us for this course, hope this helps!

Jasmine Salameh2K

That's a really good question so our pka and pub value is necessary to determine if an acid is weak or strong while pH is used to tell us if a system is acidic or alkaline.

Jasmine Salameh2K

How do I know when to use ideal gas law when solving for chemical equilibrium and how do I go about it?

Jasmine Salameh2K

Hello, I missed lecture on Monday due to being sick. Can someone explain to me how I would to about solving percent ionization on one of the achieve problems
Thank you

Jasmine Salameh2K

Basic refers to a level of pH while alkaline is moreso a buffer measuring how much acid is needed to lower pH. Hope this definition helps you!

Jasmine Salameh2K

When you are looking for the H+ concentration you are measuring the pH, and when calculating pOH you are calculating the concentration of OH-, hope this helped!

Jasmine Salameh2K

On question 6 of achieve, how would we go about determining whether a salt is acidic, basic, or neutral?
Thank you

Jasmine Salameh2K

If I have the Ka of a weak acid, how would I go about finding the pH?
thank you

Jasmine Salameh2K

Can someone tell me where I am going wrong with my arithmetic or trying to solve this problem. I linked my work and the question below. Thank you!

Jasmine Salameh2K

This is true, neither the products or reactants are favored and K being equal to one is seen very rarely because a majority of the time we will see either or being favored.

Jasmine Salameh2K

This is true, neither the products or reactants are favored and K being equal to one is seen very rarely because a majority of the time we will see either or being favored.

Jasmine Salameh2K

Hi Amanda! I honestly struggled with this question 2 as well and ended up watching "Chemical Equilibrium Constant K - Ice Tables - Kp and Kc" on YouTube. I recommend it especially for the ICE table problems. Although we don't know [2SO2] we can still solve the equilibrium. Initial: .940 0 ...

Jasmine Salameh2K

Can someone tell me where I am going wrong, I keep missing this problem and think there might be something wrong with my format, but can't tell.

Jasmine Salameh2K

Can someone please tell my where I'm going wrong on solving this problem. I did the ICE table and recalculated my values, but I still can't find my issue.

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