CHEMISTRY COMMUNITY

Abby-Hile-1F

Joonsoo Kim 4L wrote:I believe that if E(red) is strongly positive, the reaction favors reduction, so it would be a good oxidizing agent. Contrarily, if E(red) is strongly negative, the reaction favors oxidation, so it would be a good reducing agent.

Ok yeah that makes sense, thank you!

Abby-Hile-1F

Eruchi Okpara 2E wrote:Has Lyndon posted his practice exam for the final exam?

Yes, I think its called "pork ramen" lol

Abby-Hile-1F

Thank you!

Abby-Hile-1F

Thank you!

Abby-Hile-1F

The cathode is always the reduction half rxn and is on the left side. I'm not sure about overall charge

Abby-Hile-1F

I remember him saying that getting below a 50% means you are at risk of failing, but I'm not really sure how he does the final grade.

Abby-Hile-1F

I'm mostly doing lots of hw problems!

Abby-Hile-1F

How do you determine what n is?

Abby-Hile-1F

If the Gibbs Free energy of a rxn is lees than zero, then that means it will occur spontaneously.

Abby-Hile-1F

If you have an initial temp and final temp (that is temp is changing and volume is not), then you would use the equation with ln(T2/T1). Versus if its the opposite (temp is constant and volume is changing), the you would use the equation with ln(V2/V1).

Abby-Hile-1F

Do we only need to know the ideal gas constant for monatomic ideal gases and not the others?

Abby-Hile-1F

How can you tell if a rxn is reversible or irreversible?

Abby-Hile-1F

will we need to identify processes as isobaric, isochoric, or isothermal?

Abby-Hile-1F

H2O is used to balance oxygens, then since you added extra H with the water, you balance the H2O with H+

Abby-Hile-1F

How do you determine which half rxn is the oxidation half and which is the reduction half? I always get confused on this.

Abby-Hile-1F

I'm pretty sure if you r final answer has water on both sides you can cancel out no matter what, since that gives the same but a simpler answer.

Abby-Hile-1F

since oxygen atoms are balanced with H20, you have to then balance the H20 with H+. Because of this, you would put the H+ with the Cr2O7

Abby-Hile-1F

How do you know if a reaction requires a platinum electrode?

Abby-Hile-1F

Do you use a comma if there is more than one aqueous species?

Abby-Hile-1F

I know there are some exceptions to this, but how do you know if an element in a particular atom has a different oxidation number than usual (the one indicated by position in the periodic table?

Abby-Hile-1F

How do you tell if something will have reducing or oxidizing power, I know it depends on the sign of E, but which is which?

Abby-Hile-1F

Do you just use 5/2R when it is at constant pressure?

Abby-Hile-1F

It should be on the equation sheet.

Abby-Hile-1F

I feel like we won't need to do any calculations with derivatives. I think those equations were given just to help our understanding.

Abby-Hile-1F

Since neither energy nor matter can be exchanged in an isolated system, the energy cannot change and will remain constant.

Abby-Hile-1F

What time is his review session on Monday?

Abby-Hile-1F

So if pressure is not given, can we assume that it will remain constant at 1 atm?

Abby-Hile-1F

In class he said that the only thing we have gone over in class that will not be on the midterm is Gibbs Free Energy.

Abby-Hile-1F

Asking questions on here is usually helpful and you can also just search for a topic and look at other peoples posts to clarify anything you may be confused about.

Abby-Hile-1F

PV=nRT can be used to relate Kc and Kp since you can use it to convert between partial pressure and concentration.

Abby-Hile-1F

Kc can be used for both aqueous and gasphases, but Kp is for gases since you use pressure. And the ideal gas law can be used to relate Kp and Kc

Abby-Hile-1F

name the ligands in alphabetical order (ignoring the greek prefixes)

Abby-Hile-1F

How do you specify if a ligand is polydentate when naming the compound?

Abby-Hile-1F

In order for the interaction to be strong enough, the Cl's must be on the same side and must create a net dipole.

Abby-Hile-1F

How would you be able to tell if something is a polyprotic acid/base?

Abby-Hile-1F

Do we just need to understand the general concepts of Ka and Kb, but will not need to solve anything with them?

Abby-Hile-1F

Is there a list of strong acids posted on the class website?

Abby-Hile-1F

I am pretty sure that this conversion factor is on the equation sheet given to us during tests as well.

Abby-Hile-1F

Will all bond lengths be in Angstroms?

Abby-Hile-1F

One thing to look for is if something has a lone pair of electrons, it would be a Lewis base because it would donate those electrons.

Abby-Hile-1F

larger atoms have more attractive forces between them because they have more electrons, so they they will have stronger dispersion forces holding them closer together and will therefore be liquid at room temp rather than gases.

Abby-Hile-1F

Electronegativity decreases as you go down a period because the atoms have more shells of electrons, so the valence electrons are farther from the nucleus. This means that the pull on the electrons is not as strong as in the atoms closer to the top of the period.

Abby-Hile-1F

How would you find the bond length in a resonance structure? Would it just be the average of the different length bonds?

Abby-Hile-1F

For me Khan Academy helps a lot and also watching Lavelle's modules since you can stop if you are confused and rewatch sections that you may not understand.

Abby-Hile-1F

Is the homework due in discussion this week? For some reason I thought he said something about turning it in on Friday.

Abby-Hile-1F

I was unsure about what the problems meant by formula units as well, but I just treated it as sort of a synonym for "molecule". So one of the problems asked how many formula units of a compound are in 5.15 g, I just found how many molecules would be in 5.15 g, using Avogadro's number.

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