CHEMISTRY COMMUNITY

Jesse_torres2H

What are the two different variations of the Van't Hoff Equation and when do we use each one?

Jesse_torres2H

From the practice midterm question 6a reads we can expect an endothermic reaction to be favorable at a very hight temp. Why would this be false?

Jesse_torres2H

for part a of the question the equation they give is AgBr(s)---->Ag+(aq) + Br-(aq). It then lists the cathode reaction as Ag+(aq) + e- ---->Ag(s). Why does the AgBr turn into just Ag in this case?

Jesse_torres2H

This question you are supposed to write the cell diagram for the equation Ce^4+(aq) + I^-(aq)---> I2(s) + Ce^3+(aq) the solutions manual has the cell diagram as Pt(s)|I-(aq)|I(s)||Ce4+(aq),Ce3+(aq)|Pt(s). Why do we need the Pt at the anode I thought solids, in this case I, could be used as electrodes.

Jesse_torres2H

What should we know about nucleophiles for the final exam?

Jesse_torres2H

Is it possible to determine what step is the slow step and what step is passed if we are only given the rate law?

Jesse_torres2H

Could we be asked to draw a reaction profile on the final exam?

Jesse_torres2H

The rate of C2 gas consumption in this reaction is constant throughout and is given as 0.250 M/s. If you reaction vessel starts with 0.35M of ABC, how long will it take to get to 24.00M of ABC? The equation give is AB+C-->ABC. Can someone explain how they did this please.

Jesse_torres2H

Will questions involving functional groups be included on the final exam?

Jesse_torres2H

When pressure is held constant what equation do you use to calculate the work done?

Jesse_torres2H

In lecture it was said that termolecular reactions are rare. If this is the case could we still be given an example of one on a test or do we not have to worry about them at all?

Jesse_torres2H

Yes rate determining and rate limiting can be thought of as the same thing.

Jesse_torres2H

I'm still unsure on this problem as well, after you find delta g how would you find the standard potential of the cell?

Jesse_torres2H

The slowest step in a reaction is the one with the higher activation energy.

Jesse_torres2H

Can someone clarify what exactly molecularity is.

Jesse_torres2H

How do you determine what order a reaction is?

Jesse_torres2H

In lecture I wrote this down, Rate=-1/a*d[A]/dt=k[A]^2 and then the next thing was just -d[A]/dt=k[A]^2. What happens to the -1/a?

Jesse_torres2H

What exactly does it mean when a system is adiabatic?

Jesse_torres2H

In this problem it says the reduction potential of water is -0.42V, is this somewhere in the appendix or are we just supposed to have this memorized?

Jesse_torres2H

In this question you are supposed to balance the redox equation the answer reads, 8H+ + Cr2O7^2- + 3C2H5OH---> 2Cr^3+ + 3C2H4O + 7H2O. why do you need the 3 in front of C2H5OH and C2H4O

Jesse_torres2H

Which reaction relates to which, is the reduction reaction the anode and oxidation is the cathode or is it the other way around?

Jesse_torres2H

I believe it depends on the molecule the halogen is in for example in HClO Cl would have an oxidation state of +1

Jesse_torres2H

What elements oxidation states are most important to memorize?

Jesse_torres2H

I was working on the practice midterm and on question 2C it mentions the enthalpy of sublimation of graphite. What exactly is enthalpy of sublimation and when do we use it?

Jesse_torres2H

What value indicates spontaneity is it a positive or negative delta g

Jesse_torres2H

A coffee cup calorimeter involves using a styrofoam cup so it could be referred to as a styrofoam cup calorimeter but I don't think Dr. Lavelle has ever called it this.

Jesse_torres2H

For questions involving Hess's law are we going to be given the reactions involved or are we going to have to write them ourselves?

Jesse_torres2H

Is there a specific reason the equation H=U-PV is not on the constants and equations sheet? Should we just simply memorize this?

Jesse_torres2H

In this problem the temperatures are given in celsius but in the solution we use them in units of kelvin without adding 273. Why is this possible?

Jesse_torres2H

"What percentage of heat is used to raise the temperature of the water? (See Table 8.2)" the solution manual has you divid 1.30*10^5 by our answer from part a where does this number come from?

Jesse_torres2H

If we have something like HClO2 and HClO the additional O in HClO2 increases the electronegativity and helps to pull the electron in H out of the H-O bond. Hope this helps a little bit.

Jesse_torres2H

Does Kr have a greater first ionization than Mg because its valence shell is complete? I figured since Mg is much smaller it would have a larger first ionization energy.

Jesse_torres2H

In the compound [NiBr3(CO)2] why is Ni3+ the Lewis acid?

Jesse_torres2H

Probably pretty important to touch up and chapters involving wavelength, frequency, and energy. This was a major topic we covered in the course.

Jesse_torres2H

Nitrous acid acts like a strong acid because its conjugate base is weaker than the acetate ion that is present. This presence of acetate will shift the reaction towards the products which will increase the Ka of nitrous acid causing it to act like a strong base. I'd assume that it is the same for pa...

Jesse_torres2H

Are we expected to memorize pKa and Pkb values because this problem made it seem that way.

Jesse_torres2H

Might be a dumb question but in the solutions manual it says Kw=[H3O+][OH-]=1.0*10^-14. Where does this value come from?

Jesse_torres2H

How can you determine if an oxide is acidic basic or amphoteric. The examples from this question are BaO, SO3, As2O3, Bi2O3

Jesse_torres2H

Today in lecture Dr. Lavelle was talking about finding Q, what does Q actually represent I was a little confused.

Jesse_torres2H

Can someone explain the notation that involves px1 py1 and pz1. In what cases do we write the configuration like this.

Jesse_torres2H

Is there going to be class held on this coming Friday even though it is a holiday?

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