CHEMISTRY COMMUNITY

Lauren Lewis3L

Cisplatin is important because it stops cell division by attaching to DNA and most importantly Guanine.

Lauren Lewis3L

The 2 in the front is not needed it just lists the group. You can just drop the 2 off in the front. Just matters if you accurately know the geometric shape and the electron densities.

Lauren Lewis3L

I know this is not completely accurate, but I usually look for Nitrogen atoms since usually they have lone pairs that can be used for bonding sites. If there is 2 or more Nitrogen then it would be considered polydentate.

Lauren Lewis3L

The lone pairs in hybridization is to be considered as an electron density. You would count it as you would like any atom bonded to the metal.

Lauren Lewis3L

Lavelle said that you can use either one, but it is typically easier to use the one that ends in -o rather than the -ido. Take Chlorine for example, it would be chloro or either chlorido.

Lauren Lewis3L

It is important to know that it is a bidentate due to the Nitrogen's ability to bind to other atoms due to their lone pairs. The lone pairs are on separate atoms and not the same Nitrogen atom, but both of them.

Lauren Lewis3L

What makes it neutral??? Is it because their charges cancel out?

Lauren Lewis3L

I know this is such a stupid question but where in the textbook does it cover acid and bases?

Lauren Lewis3L

If you go online to YouTube there are a lot of helpful videos that organize all the different ligand names based of similarities and all that and if it has one negative change or two. The guy recommended just doing flashcards for each one till it come naturally. It's a bummer but I guess just someth...

Lauren Lewis3L

I feel like just know both since it may be a curveball that may be thrown on the exam. A lot of YouTube videos go step by step doing both ways so you can always pause the video to see if you can do it both ways.

Lauren Lewis3L

My confusion is I know that if it is negative the change the ending of something to -ate? My question is what is that something? Is it the transition metal that becomes -ate or a ligand? Also what are we looking at that is negative?

Lauren Lewis3L

What I always do is write out the complex compound and then whatever the transition metal is, I assign it a variable usually "X". I set the the side equal to zero and solve as if it is an algebraic equations.

Lauren Lewis3L

This is important for shape because although a shape may have the same amount of ligands the amount of lone pairs from 1,2, and 3 make a large difference in the shape of the molecule

Lauren Lewis3L

No it doesn't matter, in the book it usually doesn't put the one. I think that is just implied that there should be a one. Obviously for the other one when it is E2 you should definitely put the number.

Lauren Lewis3L

What does it mean to have a dipole moment and how does this determine if the molecule is polar or nonpolar? Plus I dont understand when people ask if there is symmetry. Are we looking for the shape or if things cancel out?

Lauren Lewis3L

Yes, the see-saw is less then 90 and 120 degrees because there are lone pairs. Lone pairs create repulsion which brings the atoms together lowering their original angle.

Lauren Lewis3L

Remember with the bent shape and how it is angular, you need to know that there is a different angle degree for the different VESPER formula. AX2E2, will have an angle that is less than 120 degrees. But when it is AX2E3 the bond angle is less than 109.5 degrees.

Lauren Lewis3L

Remember with the bent shape and how it is angular, you need to know that there is a different angle degree for the different VESPER formula. AX2E2, will have an angle that is less than 120 degrees. But when it is AX2E3 the bond angle is less than 109.5 degrees.

Lauren Lewis3L

I know this may be a stupid question, but how can you determine the shape by doing the Lewis Structures. I understand you can see all the bonds and the lone pairs but I am just confused because I'm afraid that if I draw it out that I won't be able to determine the shape from that.

Lauren Lewis3L

Can explain what it means when it states in the book that it is nonpolar if it can "cancel out". I am just confused as to what is being cancelled when talking about atoms?

Lauren Lewis3L

Does anyone know if we need to have all of the bond angles of each shape memorized for Test 2? Also on that note if we do, do we need to know by how many degrees a lone pair would affect the angle or just that it would make it smaller due to electron repulsion pushing down the other atoms. Thanks! ...

Lauren Lewis3L

Yes memorize them and know the angles for them because it can give you information on lone pairs and how it affects the degree of the angle.

Lauren Lewis3L

Yes, I believe that is true! I think from what I comprehended from my discussion section is that you just state if the angle is greater than or less than the angle degree that they give to you. For example <109.5 degrees.

Lauren Lewis3L

Atomic radii is the opposite of electronegativity. When you move down a group the atomic radii increases and when you move from right to left the radii increases as well.

Lauren Lewis3L

How do you know if the magnetic spin is positive or negative? (+1/2 or -1/2)?

Lauren Lewis3L

Usually whenever I hear photon in a question or threshold energy, I immediately got to the photoelectric equations. These equations being the one for Kinetic Energy (1/2 m(v)^2). It is important to understand that velocity value is the only thing being squared and not the entire equation.

Lauren Lewis3L

The most electronegative element would be Flourine. When you move down a group the electronegativity decreases. However, when you move from left to right in a period the electronegativity increases. It makes it easier for me to draw a line from the bottom left corner to the top right corner to visua...

Lauren Lewis3L

To find the longest wavelength in the photoelectric effect is it just taking the energy minus the work function and set it equal to the Kinetic Energy? Wouldn't the Ek be equal to zero for the longest wavelength?

Lauren Lewis3L

As far as I got on that problem was similar to how you solve for the one that was on Dino Nuggets. I'm pretty sure that the one on the Dino Nuggets was question one as well. I just tried to get as much as I could on the paper. I did some conversions and also did some mole to mole ratio for each of t...

Lauren Lewis3L

Is threshold a constant value? Also is hvphoton= threshold +1/2MeV^2 or is hvphoton +theshold = Kinetic energy

Lauren Lewis3L

When do you know to use the rydberg equation? Also I'm not sure if I wrote the equation wrong but is the Rydberg constant multiplied by another constant or? The Rydberg equation is multiplied by another constant when using it to figure out how the electron moves from orbital to orbital. The R is mu...

Lauren Lewis3L

When solving for the energy of final orbital-initial orbital do you use the equation En=-hR/n^2? I believe that has to be set equal to hv to figure out the frequency but I'm not entirely sure?

Lauren Lewis3L

Does l essentially just represent the block that is is in from the n value of being (n-1)? so like 0,1,2,3... is just s,d,p,f?

Lauren Lewis3L

Are we going to get the Planck's constant number or do we have to memorize it?

Lauren Lewis3L

There is only one ground state for an atom (when it has the lowest potential energy). You find this configuration by following the various rules. Aufbau's rule states that you fill the lowest energy 1s 2s 2p ect orbitals first. Hund's rule states that you should have as many electrons with parallel...

Lauren Lewis3L

On homework problem 1E.7 they give you configurations of atoms, but I am just confused on how you know when it is at ground state rather than excited? What are you looking for to determine this?

Lauren Lewis3L

Do you guys know if we are going to go pass 3d when writing the notation? I remember my TA saying something about this but I am not entirely sure.

Lauren Lewis3L

Is the "h" in the E=hv equation a constant value? Is this plank's constant?

Lauren Lewis3L

When reading the 1D section it said for positive numbers to label it with the plus sign rather than just writing the number. Do you guys think/ know if that is just a suggestion or if we will get marked down if we do not label both the positive numbers with a plus sign?

Lauren Lewis3L

My confusion in the question is with the 6. I know that the d sub shell corresponds with 2, so for example ml: -2,-1,0,1,2. I just don't know what to do with the 6? Can someone explain this to me pleaseee!

Lauren Lewis3L

Are we supposed to use the orbital angular momentum equation when finding the quantum number "l" for shape? Is this equation needed? I am getting confused on all these formulas we haven't even been introduced to in lecture from the textbook.

Lauren Lewis3L

Does anyone know why the 4s comes before the 3d again I was confused on what he was saying? Also why does the d- orbital start at 3 on the periodic table but but if you count down from hydrogen it is 4?

Lauren Lewis3L

Is there a particular equation to use for these two series?

Lauren Lewis3L

Does anyone know if we are allowed to do the quantum homework problems for this week's homework or are we moving on to the next section? I remember lavelle saying that we are finishing quantum on Monday.

Lauren Lewis3L

Does anyone know if Peer Facilitated Learning is still available? I tried signing up through my portal, but it took me to my class planner making it seem like it was a class to put on my schedule. I went under academics and then hit Peer Learning. Can someone help me out?

Lauren Lewis3L

The Step- Up are more step by step practice and at a slower pace while the workshop is more for if you have a specific question to ask rather than learning at a slower pace.

Lauren Lewis3L

Is it possible for there to be a question where they ask you to find the other reactant or the amount of it from the product and one of the reactants? If so how would you proceed to work through a problem similar to that?

Lauren Lewis3L

After figuring out which is an excess and limited reactant, how are you able to calculate what is remaining of the excess reactant? Is it Total Reactant-Reactant Used? If so then how do you determine how much of the excess is used?

Lauren Lewis3L

When you convert the two reactants to moles how do you decide which one is limiting from there. I know that the smallest of the moles doesn't mean anything. It says in the steps to compare required moles to the calculated moles. Does that mean divide the calculated by the required? This part just re...

Lauren Lewis3L

Can someone please explain percent yield to me! I am confused on how to get the actual value versus the theoretical from the equation.

Lauren Lewis3L

Do you guys recommend reading the textbook with the homework or just doing the practice problems from the book? Also do you guys go over the problems multiple times or just do it once and then move on?

Lauren Lewis3L

I have this diagram that my Sophomore year chemistry teacher gave us for finding ways to get moles. Is dividing monatomic atoms by Avogadro's number the same thing as going from atoms to moles or does that require you to go from atoms to molecules and then moles?

Lauren Lewis3L

When finding the molar mass of the reactant and product, do you combine both the molar masses of the reactants that make up the products or do you keep them separated by the addition sign?

Lauren Lewis3L

When trying to find what number to multiply by does it have to be an exact whole number or can it be like for example 3.1, can we just say or believe it to be the whole number 3?

Lauren Lewis3L

In this case, are we required to assume that oxygen is always two even in a chemical equation so that when finding the molar mass it is 32.00 and not 16.00?

Lauren Lewis3L

What did Lavelle mean when he said that Kelvin and Celsius coincide with one another? For example, he was like the freezing point of 0 Celsius is equal to the Kelvin freezing point at 273.15 ------> (kelvin=0+273.15)

Lauren Lewis3L

What is the difference in units when the power is to a power of 9 like "Giga" in comparison to the power of negative 9 like in "Nano"? Does this suggest they way you move the decimal for that unit for the final answers?

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