CHEMISTRY COMMUNITY

Jimmy lira-1G

I'm not sure if we have to memorize this for the test but here is a vid that would help you out

https://www.youtube.com/watch?v=G01ybx24hJg

-Jimmy Lira 1G

Jimmy lira-1G

I believe it is 72 and 90 degrees

check out this link!

https://chemistryonline.guru/hybridization-sp3d3/

-Jimmy Lira 1g

Jimmy lira-1G

Writing it in this order shows which element is going to be bonded by the metal; your question is somewhat unclear but I hope this answers your question!

-Jimmy Lira 1G

Jimmy lira-1G

If a molecule forms a ring structure with a ligand and metal does that always mean this ring shape is a polydentate ligand??

-Jimmy Lira 1G

Jimmy lira-1G

Can a ligand bind to a metal if it has a double bond? In section we discussed how it is harder for double bonds to stretch and rotate to bind to a specific metal, does that mean all double bonds don't bind to metals?

-Jimmy Lira 1 G

Jimmy lira-1G

What is the difference between pKA and KA for in terms of acidity?

-Jimmy Lira 1G

Jimmy lira-1G

To answer your question: "Lone pairs have the greatest repelling effect because they are closer to the nucleus of the central atom compared to the bonding pairs, therefore they repel other lone pairs greater compared to bonding pairs. Bonding pairs have a bond between the nucleus of the central...

Jimmy lira-1G

To see more details about lone pairs and how they affect bond angles check out this file!

-Jimmy Lira 1G

Jimmy lira-1G

So when describing the structure in terms of hybrid orbitals it is referring to hybridization where you would 1. Look at the atom. 2. Count the number of atoms connected to it (not bonds – atoms). 3. Count the number of lone pairs attached to it. 4. Add these two numbers together. 5. put this number...

Jimmy lira-1G

How are anti-bonding orbitals and bonding orbitals created/formed?

-Jimmy Lira 1G

Jimmy lira-1G

I was just wondering if there are any exceptions to hybridization of molecules? Also, will we see anything bigger than an octahedral (sp3d2) on the test?

-Jimmy Lira 1G

Jimmy lira-1G

Are the # of regions of e- density always the same as the # of hybrid orbitals?

-Jimmy Lira 1G

Jimmy lira-1G

So I looked up your question and did some research and found link that is really helpful check it out !!

https://courses.lumenlearning.com/chemi ... constants/

-Jimmy Lira 1g

Jimmy lira-1G

I believe that this means which has more resonance structures . So whichever has more structures that contribute to resonance has the most resonance .

-Jimmy Lira 1G

Jimmy lira-1G

As stated above , yes it is because of the d orbital as the d contains 10 , so these elements can have an expanded octet as they can have the d orbital
-Jimmy Lira 1g

Jimmy lira-1G

Which effects dipole more radius size or ionization ? Or do these factors not effect dipole ? Only electronegativity effects dipole ?

-Jimmy Lira 1g

Jimmy lira-1G

For group 17 elements, I understand that they can only form one bond with other elements since they already have 7 electrons; however, is there any exceptions that would allow group 17 elements to obtain a double bond or triple bond? Just curious

-Jimmy Lira 1g

Jimmy lira-1G

What equation do we use to find bond order, as it relates to bond length?

Like I know the higher the bond order the shorter the bond length

-Jimmy Lira 1G

Jimmy lira-1G

Your question is kind of confusing, but I'm going to attempt to help you out! So double bonds are used simply when they are needed to fill the octet rule and shelves of certain combinations of elements. Whether the molecules are large or small, double bonds are used to fulfill the octet rule and mak...

Jimmy lira-1G

I found a couple of sources which could answer your question, check these links out! https://socratic.org/questions/what-is-the-difference-between-electronegativity-and-electron-affinity "1. Electronegativity is a numerical value associated with an atoms ability to form a covalent bond 2. Elect...

Jimmy lira-1G

For question 4 on Midterm 2 it asks to find the wavelength of the ejected electron, which I knew how to do; however 4b asks "can the wavelike properties of ejected electrons in part A be detected?" and this question threw me off can someone explain the conceptual answer to this question; d...

Jimmy lira-1G

More shells means that these electrons are easier to be taken away , thus more polarizability.
Also , polarizing power is the power to take electrons , while polarization is the ability to let go of your electrons .

-Jimmy Lira 1g

Jimmy lira-1G

How are polarizability and electronegativity connected? Which effects which?

-Jimmy Lira 1G

Jimmy lira-1G

Are there any exceptions to the bond length and energy rules that we went over in class today ?

-Jimmy Lira 1g

Jimmy lira-1G

Yes, it is possible the lewis structure would be placed in brackets with the correct cation or anion. This should help: http://butane.chem.uiuc.edu/pshapley/GenChem2/A1/2.html "By convention, the cation goes before the anion in a formula. Write out the Lewis structure of each atom or ion separa...

Jimmy lira-1G

I just answered this previously check this out abetterchemtext.com/Periodicity/exceptions.htm "This is the easiest of the exceptions. We have said that electronegativity increases to the right. This is true except that the trend does NOT include the noble gases. That means that fluorine has the...

Jimmy lira-1G

I think I may have found one check this link out http://www.chem.ucla.edu/~harding/tutorials/formalcharge.pdf "(The rare exception is a pure covalent bond between two identical atoms such as in molecular chlorine, Cl-Cl.) Because of this uneven sharing atoms have fractional, rather than integer...

Jimmy lira-1G

How do the ionization trends work for the periodic table ? For 1st ionization ? For 2nd ionization ?
For finding greatest or least of ionization

-Jimmy Lira 1G

Jimmy lira-1G

What do the anions have to do with the organization of the ionic radius
for example
order these :

s^2- , cl-, p^3-

Answer : p^3-, s^2-, cl-
How do I organize by increasing ionic radius with regard to the anions ?

-Jimmy Lira 1G

Jimmy lira-1G

Give the ground state electron configuration for the following:

Sn^ 4+

- I did this practice problem, but I got
[Kr]5s^2 5p^2 4d^10
However i know we have to take away the 4+ , but how do I know which to take it from ? why can't I take it away from the d ?
the answer is [Kr]4d^10

Jimmy Lira 1-G

Jimmy lira-1G

Will we need to know about van der waals forces? If so can somone explain how these forces work and if they are stronger than ionic or covalent bonds? Where would these forces apply in chem ?

-Jimmy Lira 1 G

Jimmy lira-1G

To further explain , it is from n=x to n=2 You would use the wav= h/m*v put this into terms of v and solve using 700nm given for wavelength then when v is found find energy E=hv after this En=-hR/n^2 , put in terms of n and solve when you get n then use the En=-hR/n^2 equation again with that n foun...

Jimmy lira-1G

Your question is unclear, but I do believe your statement is true , and the only exceptions are Cr and Cu, as I remember him saying that in lecture ;hope this helps https://chem.libretexts.org/Core/Physical_and_Theoretical_Chemistry/Electronic_Structure_of_Atoms_and_Molecules/Electronic_Configuratio...

Jimmy lira-1G

They are significantly different. Cavelent bonds are bonds formed between 2 nonmetals , which share their electrons to become stable. It is chemical bonding Ionic bonds are bonds formed between a nonmetal and metal ; nonmetals are stronger than metals and can get electrons from the metal. It is an e...

Jimmy lira-1G

For 2.29 it gives orbitals and the block of the orbital for example 4p orbital It asks how many electrons are available at this orbital? I got 6 electrons for 4p, but I'm not sure if I did this right can somone explain the correlation of orbitals and blocks to electron availability ? I used the peri...

Jimmy lira-1G

I'm confused on where the 6d subshell (n=7) came from is it given ? Also, do I use ml= l,l-1,...-l to find how many ml values a 6d subshell has?
-Jimmy Lira1-G

Jimmy lira-1G

Why do the elements in the periodic table cause a decrease across a period of ionic radius? I understand they decrease, but why do the specific elements cause this ?

-Jimmy Lira 1G

Jimmy lira-1G

for
energy of photon -threshold = kinetic energy
if we have to solve for kinetic do we use
e= 1/2 mv^2 or do we just use energies that are gven in the problem ??

-Jimmy Lira- 1g

Jimmy lira-1G

for the test we took there was a problem that gave us the type of light and said to find resting and excited states of n and calculate n , how would this be solved without knowing the value of n??

-Jimmy Lira -1g

Jimmy lira-1G

for threshold or work when solving for it can we use
wavlength= hc/ work ??
I have seen many people do this but still confused

-Jimmy Lira 1-g

Jimmy lira-1G

wavelenght does but amplitude doesn't, so shortning the wavlenght will help ejection but amplitude will have no effect

-Jimmy Lira 1-g

Jimmy lira-1G

4s orbitals have lower energy than 3d , so 4s are filled first ; 4s electrons are lost first during ionization so the 4s orbitals must have a higher energy then 3d orbitals which is why 3d comes after 4s Here's a helpful link https://chem.libretexts.org/Core/Physical_and_Theoretical_Chemistry/Electr...

Jimmy lira-1G

The n refers to the number of shelves ^ as stated above and can be applied to the lyman series n ≥ 2 to n = 1 (where n is the principal quantum number) and balmer series n ≥ 3 to n = 2
It can be applied to the rydberg equation

- Jimmy Lira 1-G

Jimmy lira-1G

Well Danny, A standing wave intereferes with itself, (constructively), so it doesn't show acceleration and no loss of energy Non standing waves are deconstructive, showing acceleration and loss of energy this should help: https://www.lucamoroni.it/simulations/standing-waves-in-bohrs-atomic-model/ It...

Jimmy lira-1G

I saw a question on review that asked: Draw a graph comparing the inverse wavelength of a photon versus the energy of photon (label axis) - I understand that the einstein equation us used and the equation to graph is E= hc/wavelength, however I was unclear how they graphed a line from this equation,...

Jimmy lira-1G

The equation is
change P x change X >= h/4pi

I understand how to use the equation, but was uncertain on why the pi is used in this equation, can someone please clarify?

-Jimmy Lira 1G

Jimmy lira-1G

For hw question 1.41 , I used debrogile equation, however I was confused on the mass of a neutron, it isn't given , so is this common information we need to know ? If so I didn't know which mass of a neutron to use as the internet had different amounts for the neutron I found 1.6749 x 10-27 kg. do i...

Jimmy lira-1G

Well Marina, you can memorize it and this will help https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&ved=2ahUKEwiNsLC328_aAhVJ3GMKHZuPD3gQjRx6BAgAEAU&url=https%3A%2F%2Fcommons.wikimedia.org%2Fwiki%2FFile%3AEM_Spectrum_Properties_edit.svg&psig=AOvVaw0s...

Jimmy lira-1G

Just to clarify,

wavelength= h / m
h= plancks constant 6.626 x 10^-34 j s
m= momentum= velocity x mass
so
m= h/ wavelength
velocity= h/ wavelength / mass
- Jimmy lira 1g

Jimmy lira-1G

If there are waves in constructive or destructive interference is there a limit to the amount of waves that can be joined together? Can there be more than 2 waves joined for these interferences to occur, if so do the wavelengths create like a mean wavelength overall, not speaking about amplitude, bu...

Jimmy lira-1G

I'm confused on what the difference is between the Lyman series and the Balmer series, I kind of understand it, but I just need clarification on the differences? Does the Balmer series in the ultraviolet region of the spectrum?
-Jimmy Lira 1-G

Jimmy lira-1G

Does wavelength have to be from peak to peak, because I saw many example from the book where the wavelength wasn't exactly peak to peak but a certain place on the wave to another certain place?
-Jimmy Lira 1-G

Jimmy lira-1G

What was the importance of the Geiger -Marsden experiment in terms of electrons, protons, neutrons?
-Jimmy Lira 1-G

Jimmy lira-1G

What did professor Lavelle mean by equations in Quantum mechanics have variables that are quantized , or discrete ?
-Jimmy Lira 1-G

Jimmy lira-1G

Does this mean that other light is emitted but red is the brightest because when the excited hydrogen atoms give off em radiation, 656nm em radiation is the most prevalent? To answer your question, when the excited hydrogen atoms give off em radiation at 656nm em radiation the only color present is ...

Jimmy lira-1G

Re: Difference between wave model and particle model?
There are many differences among the wave and particle model, I found a comparison chart that might help with your dilema.
-Jimmy Lira -1G

Jimmy lira-1G

Why was it important for scientists to undergo this experiment? What questions led to their conclusion and what real contribution did they expect to make with their initial hypothesis? To answer your question , the photoelectric experiment was very important as it is used now to determine electron e...

Jimmy lira-1G

Do we have to memorize the spectrum if not how do we calculate its energy in order? I'm not really sure we have to memorize the spectrum, but I feel it would be very helpful. To answer your question, to calculate the energy first use (c = λ × ν), then after finding the frequency use Plank's equation...

Jimmy lira-1G

Hello danny ! Well this is quite simple actually, you probably missed the example showing how to do this process; if the mass percentage is 65.5% the the mass percentage into grams is simply 65.5g , it is exactly the percentage without the % symbol, hope thats helpful !!!

Jimmy lira-1G

I don't understand why we can't leave fractions in front of a element in a chemical equation when balancing; why is it required to get rid of fractions, is there a scientific reason for this or just simply so that the ratios of the balanced chemical equation have whole #s? \

-Jimmy Lira- 1G

Jimmy lira-1G

Yes, it is asking to find the empirical formula from the mass percentages of Vanillin. They give you mass percentages of 63.15% C, 5.30% H, and 31.55% O. The mass percentage of each element X, m(X), in exactly 100g of the compound is equal to its mass percentage in grams; so 63.15% is 63.15g and so ...

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