CHEMISTRY COMMUNITY

Ekayana Sethi 2K

Is delta G the amount of energy free to do work(ie max work) only at standard G or any G? or is it when temp and pressure are constant?

Ekayana Sethi 2K

for a concentration cell the E standard, Delta G standard and K will be 0 but delta G(not standard), E cell and Q will have some value if concentration is different at anode and cathode?

Ekayana Sethi 2K

when do we use the Erxn equations containing ln and when do we use the Erxn equation using log? On contains (RT/nF)lnQ and the other one is (0.05916/n)logQ.

Ekayana Sethi 2K

What is electro motive force and when is potential of a cell maximum?

Ekayana Sethi 2K

Do complex molecules have higher or lower molar entropy than simple molecules and why?

Ekayana Sethi 2K

for a thermodynamically stable reaction what will be the signs of delta H, deltaS and delta G?

Ekayana Sethi 2K

Is a reversible system the same as a perfect system because in both deltaS system= -delta S of surrounding?

Ekayana Sethi 2K

When asked to write the second law of thermodynamics would we explain the delta S for reversible and irreversible processes? and for a reversible does it have to be isothermal reversible for delta Stotal to be 0 or can it simply be just reversible?

Ekayana Sethi 2K

IN an endothermic reactions the forward Ea is greater than the reverse Ea so will it favor reactants or products?

Ekayana Sethi 2K

Suppose that 50.0 g of H2O(l) at 20.0 C is mixed with
65.0 g of H2O(l) at 50.0 C at constant atmospheric pressure
in a thermally insulated vessel. Calculate S and Stot for the
process.
since delta T is 0 is it reversible or irreversible?

Ekayana Sethi 2K

To find the k from experimental data do we have to find the k from each experiment and then find its average? Or just any one experiment to find k?

Ekayana Sethi 2K

What would the differential rate law graph of 0 order reactions look like? how would we graph [A]o against the initial rates? would it be a positive slope negative slope or a line parallel to x or y axis?

Ekayana Sethi 2K

yes I know how to calculate in terms of A but what about in terms of B?

Ekayana Sethi 2K

For the first-order reaction A -->3 B +C, when [A]o is
0.015 mol!L"1 , the concentration of B increases to 0.018 mol!L"1
in 3.0 min. What is the rate constant for the reaction expressed
as the rate of loss of B?

Ekayana Sethi 2K

2 A --> B + C, given that [A] is 0.153 mol!L"1 and that after 115 s the concentration of B rises to 0.034 mol!L"1.
In this we find At by subtracting 0.068 from Ao. but if B was a reactant and it was increasing would we add it instead of subtracting?

Ekayana Sethi 2K

When 0.52 g of H2 and 0.19 g of I2 are confined to a 750.-mL reaction vessel and heated to 700. K... How come the volume of each is 0.750L. im confused is the total mixture 750ml or or each is 750ml because it says a reaction vessel so wont the total be 750ml? can somebody explain?

Ekayana Sethi 2K

What does n half lives mean?

Ekayana Sethi 2K

what does the graph of 0 order look like?

Ekayana Sethi 2K

Will derivations be included in the test and final?

Ekayana Sethi 2K

At equilibrium is K=1? wouldnt that make Estandard 0? But if Q=1 is Q also at equilibrium? Wouldnt that make Erxn=Estandard?

Ekayana Sethi 2K

I know that Erxn at equilibrium is 0. At equilibrium is Erxn=Estandard? So is Estandard also 0 at equilibrium?

Ekayana Sethi 2K

can someone please explain what a PH meter is? An what all is known and what we are trying to find using the PH meter hence what is unknown?

Ekayana Sethi 2K

Does q=0 always imply that deltaT is 0 making deltaU 0?

Ekayana Sethi 2K

For which different conditions is Delta U 0 making work=-q. I think deltaU is 0 in an isolated system, isothermal system, at equilibrium and when initial and final conditions are same. Is there any other time when delta U is 0? correct me if im wrong.

Ekayana Sethi 2K

in lyndons sample midterm in 3B how do we calculate the final pressure?

Ekayana Sethi 2K

When reaction is endothermic at q is positive is change in T always positive implying that Tfinal is greater than T initila and the temperature was increased?

Ekayana Sethi 2K

for the midterm on Wednesday do we need to know how to derive any formulas because today in lecture Dr. Lavelle said derivations wont be on the test?

Ekayana Sethi 2K

In which of the following phase will the substance have higher entropy?
1. gas or aq phase
2. aq or solid phase
3. aq or liquid phase

Ekayana Sethi 2K

what if the standard reaction takes place for 2 moles? eg 2H2+o2----> 2H20. do we also divide this by 2 to find enthalpy in KJ/mol?

Ekayana Sethi 2K

what is the difference between enthalpy of a reaction and the standard enthalpy of reaction? for which one do we have to divide it by moles to get it for per mole?

Ekayana Sethi 2K

Are the entropies of irreversible and reversible reactions the same? how are they related?

Ekayana Sethi 2K

if a beaker has a reaction taking place the system is the reaction but is the surroundings the beaker or the atmosphere? also if the beaker was immersed in a water bath the system will still be the reaction but what will the surroundings be? Is it the water bath or the beaker?

Ekayana Sethi 2K

Are the pressures and volumes constant in a closed and isolated system?

Ekayana Sethi 2K

what is the delta(n)? I thought it was 2 but the solutions manual says it is 2/3 why is that?

Ekayana Sethi 2K

is deltaS=n*R*ln(T2/T1) or deltaS=n*C*ln(T2/T1)? because the book uses both. Also when do we know which one to use when?

Ekayana Sethi 2K

What chapters will be covered in the coming midterm? and will the new chapter that professor Lavelle teaches next week be included in the syllabus?

Ekayana Sethi 2K

What exact parts of chapter 11 do we need to read through for the coming midterm?

Ekayana Sethi 2K

is delta(H)=delta(U)-delta(n)*R*T or delta(H)=delta(U)+delta(n)*R*T? Also is work -P*delta(V) or +P*delta(V)?

Ekayana Sethi 2K

the enthalpy of vaporization is deltaH=Hvapor-Hliquid. What is the difference between deltaH and just H and where do we find the values for H(NOT deltaH!) of vapor or liquid of a substance?

Ekayana Sethi 2K

in expansion work the volume increases. does the pressure change or is it constant at 1 atm?

Ekayana Sethi 2K

to change internal energy you can add or subtract matter to or from the system, do work on it or make it do work and add heat or subtract heat from it.
since it is specifically asking how to increase internal energy it can be done by adding heat to it, adding matter and doing work on it.

Ekayana Sethi 2K

In lecture Professor Lavelle said something about converting all products and reactants into gas form to use bond enthalpies. I did not understand what he meant. How do we convert something into gas?

Ekayana Sethi 2K

How do we calculate delta n for a given equation? Is it number of moles of the products minus the number of moles of the reactants or the opposite? and do we include solid and liquid products and reactants or just gasses? and what if delta n is 0?

Ekayana Sethi 2K

I'm a little confused about the difference between enthalpy of formation and enthalpy of reaction? could someone explain please?

Ekayana Sethi 2K

Is a living plant an open, closed or isolated system? because a human being is. What about a dead plant?

Ekayana Sethi 2K

In the book it says that "The steeper the slope of a heating curve, the lower is the heat capacity." why is this true? It also says that "The slope of a heating curve is steeper for a phase with a low heat capacity than for one with a high heat capacity." could someone explain th...

Ekayana Sethi 2K

Why did the white bear dissolve in water?
Because it was polar!

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