CHEMISTRY COMMUNITY

Aidan Ryan 1B

What equations will we use for buffer questions.

Aidan Ryan 1B

I think so. Use E(cathode)-E(anode) and find which combo will be positive.

Aidan Ryan 1B

Today in lecture I think he said balanced half reaction includes the balancing with e- being equal.

Aidan Ryan 1B

Often questions are from chem community so look at those too

Aidan Ryan 1B

What are the Y axis 0th through 2nd order?

Aidan Ryan 1B

No I don't think so. Also where would gaseous water be in a galvanic cell?

Aidan Ryan 1B

They are not rounded like that as far as I know

Aidan Ryan 1B

Are the units changed in the answers?

Aidan Ryan 1B

using the equation delta G=deltaH-T(delta S)

Aidan Ryan 1B

"does anyone know when Test 3 is???"
It is test 2 and is during your discussion next week

Aidan Ryan 1B

What would a reversible rxn look like in real life vs an irreversible?

Aidan Ryan 1B

What are things we have learned that are not state functions?

Aidan Ryan 1B

Hey! What is kinetic control?

Aidan Ryan 1B

Gibbs free energy and electrochemistry according to the website

Aidan Ryan 1B

Just wondering where did you find this?...

Aidan Ryan 1B

This equation is BE of reactants- BE of products right?

Aidan Ryan 1B

I think you'll use q=gCΔT

Aidan Ryan 1B

The different values relate to what it is (atom, linear/ nonlinear molecule) and it is used in an change in entropy equation nCpln(T2/T1)

Aidan Ryan 1B

298K is standard conditions for enthalpy

Aidan Ryan 1B

A Box with one side full of gas where suddenly the divider is moved and gas expands throughout the box. That is free expansion.

Aidan Ryan 1B

pKa is used to describe acids. Lower pKa= stronger.
Ka is the acid dissociation constant. -logKa=pKa

Aidan Ryan 1B

If you do the stuff described about combining two equations and canceling out are you able to write 1 equation with all of this and denote this someway?

Aidan Ryan 1B

I am not sure but I do know that U can be negative so I assume you would keep it negative if it is, to find the other values.

Aidan Ryan 1B

What do you mean by ratios? As in Products/ Reactants? -x is how much product has been taken away.

Aidan Ryan 1B

The rule about direction, as far as I remember, is when the Kq is compared to Kc. The 10^-3 rule is about strong acids/ bases and disassociation.

Aidan Ryan 1B

They both tell you how acidic a compound is

Aidan Ryan 1B

It is the addition of the Ka and Kb. It is used to solve for these.

Aidan Ryan 1B

The final equation is a combination of Grahams Law and the equation that Average Speed is directly proportional to the √ (T) (temperature). Since both equal the same thing they can be combined into the same equation which is the Average Speed= √ (T/M)

Aidan Ryan 1B

You just subtract the equilibrium conc from the initial and you have the change in molarity of ATP. You can use this to find the expected equilibrium concentration for ADP and Pi because you know the ATP breaks down into the other two. Because the change was so close to all of the ATP the number is ...

Aidan Ryan 1B

Kp is for pressure, Kc is molarity and I guess Keq is just in equilibrium.

Aidan Ryan 1B

Well if the oxidation state of a cation is larger (ie 2+) then it could have 2 OH- which in turn would make it a stronger base and vice versa involving the # of H+ on more negatively charged anions.

Aidan Ryan 1B

Using a double bond I assume carbon had more than 4 lone pair e- around the carbon if I am not mistaken. Along with the double bond the FC would be -2. This would not be preferred.

Aidan Ryan 1B

The compound with stronger electronegativity will have a higher boiling point because the intermolecular forces will be stronger.

Aidan Ryan 1B

Draw the lewis structure and count the lone pairs as a region of electron density (essentially an atom when writing hybridization).

Aidan Ryan 1B

Ligands are the molecules that bind on to the central atom in a coordinate covalent structure. You name them by looking up their names in the textbook chart.

Aidan Ryan 1B

How do we know when the ligand changes names such as NH3 (ammonia) to ammine. Also how do we know the names of ligands in general?

Aidan Ryan 1B

Can hybridization help with drawing or do you have to draw the vsepr structure before figuring out the hybridization?

Aidan Ryan 1B

If you take 14 BL I think you should be solid on the 14 B material because you will begin learning the 14 B topics earlier in 14BL according to Lavelle.

Aidan Ryan 1B

What we have learned is that van deer Waals is caused by small dipole dipole interactions between molecules. The term London forces is the same thing.

Aidan Ryan 1B

I think it is important to especially when lone pairs are included. However I don't think the drawings need to be 3D.

Aidan Ryan 1B

In reality I think that they do force the other bonds away b/c there are more e- in the area but we haven't talked about this in class so I am not completely sure.

Aidan Ryan 1B

If a central atom has two atoms around it and a third area with double bonds, what would the angles be in this? 120 or would It be different due to the lone pair?

Aidan Ryan 1B

On a similar note, what is polarizing power compared to polarizability. Also are these only for ions?

Aidan Ryan 1B

Yeah you should be given the values to compare if needed

Aidan Ryan 1B

Well at least part of it may be due to the electronegativity of the halogens. The more electronegative the element the more soluble it is so it could make it in general a more soluble compound.

Aidan Ryan 1B

Hey guys. Why do some elements fill the 4s orbital to only halfway and then go to the D orbital until its filled.

Aidan Ryan 1B

abbydouglas3J
The formal charge is to determine which lewis structure is the most accurate. Whichever has the closest value to 0 is what you use.

Aidan Ryan 1B

When given an ion such as Tl^3+, how do you do shorthand electron configuration for this considering it would have the same e- count as Xe. Do you just put [Xe] or do you do you start at [Kr]?

Aidan Ryan 1B

About naming electrons... How do we label individual e- in d orbital that are the 1st or last when doing e-(y), e-(x), e-(z) as in the p orbital. Does it go v, w, x, y, z or does it work differently?

Aidan Ryan 1B

He is asking whether any wavelike properties would be visible in the cars movement (everything has wavelike movement). I don't remember the exact answer but there will not be any measurable wavelength properties for anything even close to that big.

Aidan Ryan 1B

If two electrons are in the same orbital when other orbitals are still empty in that sub shell, (such as 2p containing two e- but they are both in the same orbital) is this considered ground state or excited state. This is from part A of question 1E 7 of 7th edition.

Aidan Ryan 1B

If I understand this right, a wave function is used to describe how an electron acts inside an atomic orbital.

Aidan Ryan 1B

re: How do you figure out how many orbitals are subshells with l equal to a specific value? I am a little confused by your question. However l is the essentially and value less than the n and greater than or equal to 0. For example if n=3 then l can be 0,1 or 2. Inside sub shells are orbitals. For e...

Aidan Ryan 1B

Use Heisenbergs Uncertainty Principle. Use the equation ΔP=mΔv to plug into Heisenbergs for ΔP and you get mΔvΔx=h/4pi
Solve for Δv and you get your answer. The given value is your Δx.

Aidan Ryan 1B

It gives you measurements on the location and momentum of subatomic particles. You are looking at which of these two measurements is well known because the other will not be due to the fact that the product of these values has to be higher than a constant.
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Aidan Ryan 1B

For equations, the units need to be the same. For your answer however I think either is fine. In lecture I remember him saying nanometers are easier to understand but it doesn't really make a difference.

Aidan Ryan 1B

We are able to identify different elements through spectroscopy analysis due to the fact that all elements emit different wavelengths of light. If we look at the wavelengths emitted from some element we can see spectral lines at these wavelengths which are unique to the element and we can identify w...

Aidan Ryan 1B

One thing I am struggling to figure out is if I have 1 mol of Hydrogen gas (H2) is that the same (in terms of atoms of Hydrogen) as having 1 mol of Hydrochloric Acid (HCL)? Its been on my mind and on some questions I struggled to know which molar mass to use (as in 1.008 or double that) when given H...

Aidan Ryan 1B

@Noh_Jasmine_1G Oxygen in its gaseous state is always O2 however if bonded to a substance it does not. I think when others wrote about oxygen they may have been talking about the molar mass of oxygen which is needed not about oxygen gas (which has a mass of 32g). Hope that helps

Aidan Ryan 1B

Replying to haleyervin7. The elements themselves are either solids, liquids or gasses at STP. For compounds in a single or double displacement you can assume they are in water I believe unless otherwise stated. From that if you know if the salt is soluble it is aqueous and if insoluble its a solid. ...

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