CHEMISTRY COMMUNITY

Johnathan Smith 1D

I don’t believe he will put homework questions on the final but there should be similar questions to the homework on it if there aren’t questions directly out of the textbook.

Johnathan Smith 1D

It’s not on the equation sheet but if you know how to derive it or if you memorize it you should be fine

Johnathan Smith 1D

The only reason you would add oh is if the solution is basic and you would use it to balance the hydrogens. H20 is used to balance oxygens.

Johnathan Smith 1D

Everything on the outlines is free game for the final

Johnathan Smith 1D

How are discussion sections/review sessions going to be handled with the most recent coronavirus update?

Johnathan Smith 1D

It may or may not end up on the final but I would familiarize myself with it just in case.

Johnathan Smith 1D

On test two we were given two half reactions and their potentials. How do we know which one is the redox half reaction and which one is the oxidation half reaction?

Johnathan Smith 1D

Why do we focus on the reactants when we are determining the rate laws?

Johnathan Smith 1D

What determines a reaction as a second order reaction and not as a first order reaction?

Johnathan Smith 1D

It is on the outlines so I would still go over it.

Johnathan Smith 1D

Are we going to get our tests back this week in our sections so that we can use them to study?

Johnathan Smith 1D

You add them to balance out the hydrogen and oxygen atoms present in the interaction. For basic, you would add OH- and for acidic, you would add H+ ions.

Johnathan Smith 1D

How do we know what species is the reducing agent and what species is the oxidizing agent?

Johnathan Smith 1D

The salt bridge is meant to connect the anode and the cathode while maintaining the electrical charge of the interaction.

Johnathan Smith 1D

What is the difference between the two ? Like what does each tell us?

Johnathan Smith 1D

I do not think there are any review sessions other than the peer learning sessions

Johnathan Smith 1D

Can someone explain the difference between a galvanic and a voltaic cell?

Johnathan Smith 1D

What is the difference between G(not) and G?

Johnathan Smith 1D

Platinum is an inert conductor so it acts as an electrode to transfer the electrons

Johnathan Smith 1D

The second page of outline 4 so like Gibbs Free Energy

Johnathan Smith 1D

1 atm and 273.15 Kelvin

Johnathan Smith 1D

When do we know to use the nernst equation?

Johnathan Smith 1D

It is pushed back a week. So if your discussion is tomorrow, your test is next Monday.

Johnathan Smith 1D

On the class website it says second page of outline 4 and outline 5

Johnathan Smith 1D

It will probably be on electrochemistry and the rest of outline 4

Johnathan Smith 1D

yes it is

Johnathan Smith 1D

Thanks. That makes a lot of sense!

Johnathan Smith 1D

Yes. Isothermic is constant volume. Isobaric is constant pressure. Isochoric is constant volume.

Johnathan Smith 1D

Thanks. Alo why is it "better" to split the reactions into half reactions?

Johnathan Smith 1D

Does the change in entropy have to be constant for us to use the equation?

Johnathan Smith 1D

What is the difference between the two reactions?

Johnathan Smith 1D

What does the Hoff equation tell us and when is it important?

Johnathan Smith 1D

I did not make it to lecture on Friday so I am confused as to what a redox reaction is. Can someone explain it to me?

Johnathan Smith 1D

Entropy is q/t and q = -w. In isothermal irreversible expansions, w = nrtln(v2/v1). Put it together and you get (-nrtln(v2/v1)/t)

Johnathan Smith 1D

Would you happen to know what the answer is because I got an answer that I’m not sure is right?

Johnathan Smith 1D

When will the answers be posted for the review questions?

Johnathan Smith 1D

There’s a table in the book on pg 266 with different coefficients for different molecules

Johnathan Smith 1D

He said everything on the first page of outline 4 will be on it

Johnathan Smith 1D

I’m struggling with number five on the pizza rolls review. Does anyone know where I should start so that I can come up with an answer.

Johnathan Smith 1D

We can do outlines 3 and 4 I believe

Johnathan Smith 1D

Can someone give me an example of an isolated system that isn’t a bomb calorimeter and explain why it’s isolated?

Johnathan Smith 1D

Can someone tell me how q and h are different?

Johnathan Smith 1D

Discussion? I got mine back last week in my discussion.

Johnathan Smith 1D

Do we have to know the conversion from this question as well?

Johnathan Smith 1D

What does enthalpy mean?

Johnathan Smith 1D

Can somebody explain to me exactly what is meant by a standard state? I have an idea, but I am not sure I have it in my head correctly.

Johnathan Smith 1D

What does Hess's law describe?

Johnathan Smith 1D

Do we need to know any phase changes that would be exothermic?

Johnathan Smith 1D

Can someone explain the third method that Lavelle went over in class on Friday?

Johnathan Smith 1D

I don’t really know how to explain it but page 410 in the book talks about 5H.1

Johnathan Smith 1D

I don’t know. I didn’t use an ice table either to get it.

Johnathan Smith 1D

Does anyone know how to start number 19? It says only 60 percent of the hydrogen reaction, but I’m not really sure what to do with that.

Johnathan Smith 1D

Can someone explain what vapor pressure is exactly?

Johnathan Smith 1D

Why are gasses/aqueous substances not considered pure substances and solids/liquids are?

Johnathan Smith 1D

When we are trying to get K or Kc, are we only allowed to use gasses and anything that is an aqueous solutions?

Johnathan Smith 1D

Thank you! How do figure out the molar fractions though?

Johnathan Smith 1D

How do you calculate partial pressure?

Johnathan Smith 1D

we’ll probably need to know what was on Marshmallow. There’s a question on there on myo/hemoglobin asking for some information on the two. We’ll probably also have to know it’s function.

Johnathan Smith 1D

How does the coordination compound affect how we name the transition metal? So like instead of just saying cobalt(III) we would say cobaltate.

Johnathan Smith 1D

It's just an another way of naming it. Means the same thing, but I'm pretty sure we can use either one as long as we are consistent.

Johnathan Smith 1D

SO3 with three double bonds is not stable. When you put three double bonds around it, you're giving S 6 bonds with 12 electrons in its outer shell. S does not have a d orbital so we cannot expand its octet.

Johnathan Smith 1D

I think we will just always use ferrate when naming a coordination compound

Johnathan Smith 1D

Can someone explain how to get the pH for 34. I got the moles of each compound but can’t seem to get the overall pH.

Johnathan Smith 1D

Sorry that was my bad. I thought I had put down protons. Thanks for correcting it!

Johnathan Smith 1D

Okay I know strong acids lose the hydrogen ions easily but what exactly does that mean?

Johnathan Smith 1D

What are oxoacids?

Johnathan Smith 1D

What constitutes an acid as a super acid?

Johnathan Smith 1D

What is pKa and how do we find it?

Johnathan Smith 1D

Bronsted acids donate electrons and Lewis acids accept electrons

Johnathan Smith 1D

Bronsted acids donate electrons and Lewis acids accept electrons

Johnathan Smith 1D

They’re going to go towards whichever atom has the higher electronegativity

Johnathan Smith 1D

Chelates are just the complexes that create a ring when they are bonded to the transition metal

Johnathan Smith 1D

It depends on how many pairs of electrons are being donated. 1 is mono 2 is bi 3 is tri and 6 is hexa
*for ligands*

Johnathan Smith 1D

When they do not cancel, the molecule is polar.

Johnathan Smith 1D

Shouldn't it be 180 degrees because Be is the central atom.

Johnathan Smith 1D

I started by writing 5 nitrogens all in a line and then just started playing around with all the electrons to give me a +1 overall charge.

Johnathan Smith 1D

Because intensity of the light refers to the amount of photons interacting with the metal surface, it should be intensity that determines how many electrons are ejected. That is if the light has the right frequencies and wavelength to even eject the electron in the first place.

Johnathan Smith 1D

What topics should we expect to show up on test #2?

Johnathan Smith 1D

Can someone explain what dipole moments are?

Johnathan Smith 1D

When it's empty, the 3d-orbital requires more energy than 4s so it is placed after 4s, but when you start to fill up the 3d-orbital, the energy required to fill it becomes less than it is for the 4s-orbital which is why is 3d and not 4d.

Johnathan Smith 1D

It only works on the H-atom because there is only one electron. Once you start adding other electrons, the entire situation becomes much more complicated.

Johnathan Smith 1D

If I remember correctly, we do not really need to know this. I'm pretty sure Lavelle just wanted to show us why we have it.

Johnathan Smith 1D

Are resonance structures just all the different ways to draw the lewis models of the compounds?

Johnathan Smith 1D

Cobalt can hold 9 because the electrons are in its d- orbital which can hold 10. s holds two. p holds 6. f holds 14.

Johnathan Smith 1D

I’m sure they’re both right. I would just use the way Lavelle showed us just to be safe though.

Johnathan Smith 1D

The non metals don’t normally form cations because they are usually the ones who receive electrons from the metals they are bonding with.

Johnathan Smith 1D

Also. Remember to bring a scientific calculator!

Johnathan Smith 1D

I’m pretty sure there’s only one midterm and I would guess that it’s going to cover pretty much everything we’ve covered so far.

Johnathan Smith 1D

I know we’re past quantum numbers but can someone explain to me what quantum number m tells us and how we are able to know its value.

Johnathan Smith 1D

I think so because by using the wave function. You can determine the energy, angular momentum, and orbital orientation of the electron.

Johnathan Smith 1D

How do you determine which way an electron spins?

Johnathan Smith 1D

For the ground state configurations. The electron configuration has to follow Hund’s rule and the Pauli Exclusion Principle.

Johnathan Smith 1D

Are electrons held tightest in the s-orbitals and held the least tightly in the d-orbitals?

Johnathan Smith 1D

Is b not a ground state of an atom of Nitrogen because the electrons are not spinning the same way in the 2p-orbital?

Johnathan Smith 1D

Can someone explain how I would go about part b in problem 1B.7? I know how to do part a, but I can't figure out b.

Johnathan Smith 1D

I'm not really sure. I was just reading another post that asked a similar question and it sounded like the answer to your question is a yes. I would look at it though just to be sure.

Johnathan Smith 1D

What is the difference between an electron's particle-like and wave-like properties?

Johnathan Smith 1D

It does. Thank you!

Johnathan Smith 1D

What is the deadline for the chemistry community points? I know it's Sunday, but is it at a certain time?

Johnathan Smith 1D

Does anybody know if we'll have class the Wednesday before Thanksgiving?

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