CHEMISTRY COMMUNITY

danielruiz1G

In discussion when written as an example when written as a ligand bond, our TA told us that water was written as OH2 because O is the atom that reacts with the metal but what does writing it this way have to do with the bond structure?

danielruiz1G

In section our TA talked about coordination number, what does this have to do with oxidation number or the central metal

danielruiz1G

In the book, it says there a few exceptions where a double bond is sometimes two pi bonds instead of one sigma and one pi. Are we expected to know these instances and are there any other exceptions that we need to know?

danielruiz1G

Since it has no bonds it would be easier to donate H+ protons making it a strong acid.

danielruiz1G

for transition metals on the periodic table, they cant be assigned traditional valence electrons like the rest of the table according to the group, but in the d block it ranges from group 3 to 12 and all but group 3 that has 3 valence e-, can have a different number of valence e- depending on the si...

danielruiz1G

I believe this is the period that this atom belongs to on the periodic table.

danielruiz1G

is it possible to determine the shape of a molecule if you're only given the AXE formula, if so how do you do it?

danielruiz1G

E represents lone electron pairs. so to my understanding, it has to be a pair, if not then it is not counted for.

danielruiz1G

the negative charge of electrons repel other negatively charged electrons making them try to be as far apart from each other as possible

danielruiz1G

In the correct Lewis structure for boron trifluoride, the bond angles are 120 degrees. because the have to be equally spaced because of the electron repulsion.

danielruiz1G

do the number of regions of electron density always directly correspond to molecular shapes or are there exceptions?

danielruiz1G

How does a single electron effect molecular shape? Does it effect shape the same as how a lone pair does?

danielruiz1G

Also a covalent bond the electrons are shred between the atoms and in an ionic bond the more electronegative atom takes the electron to fulfill its octet and the other gives up it's electron and they bond because of the negative and positive charges cause them to attract.

danielruiz1G

Also by finding the formal charge you can see charges and how the affect each other as well as how they cancel out in stable molecules

danielruiz1G

Yes, like if it is how is it made stable?

danielruiz1G

I understand how to find hybridization for problems but I don't exactly understand what it has to do with. Can someone explain?

danielruiz1G

If you want more practice with hybridization I think this explains it pretty well.
https://youtu.be/4xl0BD-tMeA

danielruiz1G

When there is a single electron left why isn't it just a cation to add another electron?Wouldn't it be more stable this way?

danielruiz1G

On a structure that has 2 lone pairs on the center atom, how are we supposed to know when the strcutes go on the top and bottom or both stay on the top side?

danielruiz1G

do lone pairs contribute and have dipole moments?

danielruiz1G

I think we just have to memorize the certain ones but what makes them exceptions are if certain molecules have an odd number of electrons, if one of the atoms in the molecules has more than eight electrons, or if one atom has less than eight electrons

danielruiz1G

when seeing if a bond is ionic or covalent with the few exceptions is there a way to figure this out or do we just have to know the exceptions

danielruiz1G

how exactly do you know which atom is the central atom when drawing Lewis structures?

danielruiz1G

Hydrogen is actually a gas and forms binds with non metals

danielruiz1G

Covalent character is shown by electronegativity or how much an atom attracts electron pairs to it.

danielruiz1G

Valence electrons are the outmost electrons in an atom. these electrons are the electrons that are involved in reactions that form compounds and things like cations and anions.

danielruiz1G

So I know that there are exceptions for chromium and copper when doing electron configurations, but does anyone know exactly why this happens? My first thought is that it takes away an electron from another orbital, is this close to being correct?

danielruiz1G

unless we're asked to draw out every possible structure of electrons in a compound then yes, but if not then I don't think so.

danielruiz1G

In the definition of the octet rule in the textbook what exactly is meant when it says atoms go "as far as possible" toward completing their octets?

danielruiz1G

To answer the last part of your question, ionic bonds are formed by nonmetals and metal atoms while covalent is between two nonmetals.

danielruiz1G

i meant to the right of the m=table in the question up above

danielruiz1G

Why does Carbon have a higher electron affinity than Nitrogen when the periodic trend shows that electron affinity increases as you go up and to the left of the table?

danielruiz1G

When writing this out just remember that it is written from the lower energy levels to highest so "p,s,d,f" and must be filled in that order.

danielruiz1G

I know we learned about this is the 7 series but I don't think we need to know this since it's not too relevant to chemical bonds right now.

danielruiz1G

In problem 2.27 you're asked to find the subshell notation and are given "n" and "l" and I get how to you use the "n" and the "l" but how come the "l" given doesn't correspond with the "n" given, like wouldn't you usually use the "n&qu...

danielruiz1G

Just remember to use the rules of sig figs when either multiplying/dividing or adding/subtracting. With multi./division you keep the same number of digits as the smallest number of sig figs in your problem and for addition/subtraction, you keep the sig fig until the digit of the least accuracy.

danielruiz1G

In 2.25 I get the correlation of maximum electrons and orbitals for the most part, except for in part c wherein the 1s block the answer is 2 e, when i thought hydrogen could only have 1 electron. how can this be?

danielruiz1G

In electron configuration why do we start from 3 in period 4 when working in the d block?

danielruiz1G

when ejecting electrons does amplitude of wavelength have anything to do with it?

danielruiz1G

On test 2 on question we had to find the energy difference but were not given then levels like n=? so how would we go about doing this?

danielruiz1G

I'm confused on how exactly Borh's equation is turned into E=R(1/n-1/n) when finding the difference in energy level?

danielruiz1G

The mass of an electron is a constant that you use in the equation for kinetic energy the only other way that you have to worry about mass is when it's asking for the energy of a molecule or atom where you would them have to use the periodic table to find its mass.

danielruiz1G

In the E=hv equation, you use Planck's constant and frequency to find the energy of a photon, while with the E=1/2mv^2, you use mass and velocity to find the kinetic energy.

danielruiz1G

Radial nodes are nodes inside the orbital lobes and by looking at s -orbitals, you can see that they only have radial nodes and an angular node is fixed at certain angles.

danielruiz1G

How exactly in a problem would you find frequency when given momentum?

danielruiz1G

in the de Broglie equation why does it state that any moving "particle" , when the examples talk about cars. can any moving object talk have a wavelength?

danielruiz1G

What exactly is meant by a circular standing wave around a nucleus and how is this relevant to the spectra?

danielruiz1G

Sig figs are used to make sure your answers are accurate and remember that it depends if you are multiplying/dividing or adding/ subtracting that you either use the least amount of sig figs when you add and subtract or use the least amount decimal places when mult. / dividing.

danielruiz1G

It has no negative in front because it just doesn't make sense for a wavelength to be negative.

danielruiz1G

It depends on significant figures rules and if you're multiplying/dividing or adding/subtracting

danielruiz1G

how exactly is Planck's constant of 6.63x10j*s^-34 relevant to the equation and what does it stand for?

danielruiz1G

how do we find the mass of a solute when given the concentration using the equation given to us in class.

danielruiz1G

What is the difference when multiplying, dividing, adding, subtracting when accounting for significant figures?

danielruiz1G

why when solved are the outcomes so different like in the example Dr. Lavelle gave us with glucose, CH2O(empirical) and C6H12O6(molecular)?

danielruiz1G

most of these experiments are there as examples that are relevant to equations or many of the ideas in chemistry.

danielruiz1G

in wavelength duality, the wavelength itself is not changed by interference only the amplitude is.

danielruiz1G

So the notation s^-1 is just another way of saying 1/s and are interchangeable.

danielruiz1G

Hi Jimmy, no measuring a wavelength does not have to be peak to peak, but it is just an easier way to visualize each wave. a wave can measured from any spot to the same spot after a complete cycle has passed. hope this helps.

danielruiz1G

I'm confused on how exactly amplitude plays a role in oscillations and wavelength. can some explain this to me?

danielruiz1G

For f11 in the homework, when converting the mass percentages into its mass percentage in grams, how exactly can I convert it?

danielruiz1G

you can't have fractions when balancing equations because it wouldn't make sense to have 3/4 of a carbon atom when you cant just split atoms in ordinary chemical equations. Hope this helps.

danielruiz1G

A mol is a unit of measurement for an amount of a specific substance such as carbon or hydrogen, and they are different because they are completely different chemical substances and Avogadro's number (6.022 x 10^23 mol^-1) is just a constant when converting grams to atomic mass. I hope this helps.

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