CHEMISTRY COMMUNITY

Griffin Carter 2I

So we can assume that Ni is going to be formed at the cathode because that is the only substance that would form a solid via electrolysis in this reaction. However, the book uses the oxidation of water at the anode because it has a more negative standard E potential than the SO4- standard potential....

Griffin Carter 2I

How do we determine the order of a reaction with a given rate law for multiple reactants? ex. is the order of Rate = k[A][B] first order because both are to the first power or second order because there are two of the reactants?

Griffin Carter 2I

Zero and second order k values have different units because of their relationship to the rate which is always mol/L/sec. So because rate = k for 0 order then the units are simply mol/l/s while Rate = k[A]^2 for a second order equation so the units for k will be L/mol/s to cancel out the mol^2/L^2 of...

Griffin Carter 2I

Yes Delta G = -nFE because Delta G = We where We is the maximum non expansion work of the system.

Griffin Carter 2I

So from the problem we can see that K1 = 10*K2. We use the equation Delta Gr = -RT lnK (i will now refer to Delta Gr as G1 or G2 for convenience purposes), so K = e^-(G/RT). K1 = 10*K2 = e^-(G1/RT) and K2 = e^-(G2/RT). From here you can divide the first equation (K1) by the second equation (K2) to i...

Griffin Carter 2I

Gibbs free energy is the measurement of the maximum reversible work that can be done by a system so a negative GFE change means the system performs work or loses that energy to the surroundings which makes it spontaneous. If the GFE is positive then the forward reaction will not be spontaneous becau...

Griffin Carter 2I

In part b why are all of the partial pressure values for Kp divided by 100? Is this an approximation of the standard pressure in kPa?

Griffin Carter 2I

Probably not. I haven't seen any questions asking that in discussion or the homework.

Griffin Carter 2I

If by solving bond enthalpy equations you mean using bond enthalpies to find the enthalpy of a reaction then you want to first find out which bonds are being broken and which are being formed. Then you sum the enthalpies of the breaking bonds and the forming bonds separately. Then you subtract the s...

Griffin Carter 2I

I think all the other information necessary for the problem will be given in the question.

Griffin Carter 2I

For the first set of calculations you simply do the strong acid reaction of H2SO4(aq). This will fully dissociate because it is a strong acid. Find your concentration of H2O+ and HSO4- for this first section. For the second set of calculations, you will need to set up an ice table with HSO4-,SO4-2, ...

Griffin Carter 2I

If the error of your approximation is less than 5% then using the approximation is fine. So you find your x value through the approximation method then divide by your initial amount of weak acid or base and multiply by 100. If the number calculated is greater than 5 then the quadratic formula should...

Griffin Carter 2I

Remember that when you compare the values of Q and K it tells you the direction the reaction will proceed in order to achieve equilibrium. So when we calculated the Q value as 25 this tells us that there is a higher proportion of reactants to products than K because Q has a smaller value which means...

Griffin Carter 2I

Kc is just the equilibrium constant using the concentrations of the reaction components and can be applied to aqueous solutions and gases, solids and pure liquids are not included in the K calculation. Kp uses the partial pressures and is only applied to gases. K is just a general term for the equil...

Griffin Carter 2I

If you are referring to chapter 5 of the 6th edition then you should probably have an understanding of the units of pressure and gas laws sections of the chapter since we are using those ideas already. The molecular motion and real gases may come into play later in the class when we cover reaction k...

Griffin Carter 2I

Temperature can be assumed to stay constant in a changing pressure but the question should state specifically whether or not the volume has changed or the pressure has changed from an inert gas because that affects the Q value when comparing to K.

CHEMISTRY COMMUNITY

Search found 16 matches

Re: 6th edition, 14.55

Reaction Orders for multiple reactants

Re: Second and Zero Order Units

Re: Gibbs and Work

Re: Problem 11.111-Sixth Edition

Re: Spontaneity

11.89 6th edition

Re: State functions and Energy

Re: bond enthalpy equations

Re: calorimeters

Re: Polyprotic Acids and Bases 12.79

Re: 5% rule

Re: Week 1 Lecture 3

Re: Difference between Kc, Kp, and K

Re: How much of Ch.5 are we expected to know?

Re: Changes in Partial Pressure