CHEMISTRY COMMUNITY

Karla_Ocampo 4E

Hey guys! Im at another review for another final *crying emoji* , can someone PLEASE send me pictures of their notes?? I would greatly appreciate it!! my email is itzkar1@g.ucla.edu

Karla_Ocampo 4E

Hi, I think we should know the difference between both the acids, the calculations will probably just be strong acids however we should be prepared to calculate weak acids just in case.

Karla_Ocampo 4E

In order to find this total charge, you would have to sum the charges of the transition metal and the ligands.

Karla_Ocampo 4E

Thank you very much!!

Karla_Ocampo 4E

Hi! To find the coordination number, you count the number of atoms around the central atom.

Karla_Ocampo 4E

Hi! I dont think we need to memorize all of them but we do need to be familiar with the common ligands.

Karla_Ocampo 4E

Hi! The coordination number is just the number of atoms attached to the central atom. However as someone stated, don't count lone pairs.

Karla_Ocampo 4E

First step in determining if something is polar or nonpolar is drawing the lewis structure. Then you check for electronegativity , as stated below, if it doesn't cancel out then it is polar. It would help to also draw the 3D model to get a more closer look.

Karla_Ocampo 4E

Thank you very much for these worksheets!!

Karla_Ocampo 4E

Are we required to know the bond dissociation energies of diatomic molecules? The table 3.3 on page 93 of the 6th edition gives a list but I dont know if we're required to memorize these.

Karla_Ocampo 4E

I think its best to always draw the lewis structure so you can get the most accurate answer. This way you will be able to find the shape, lone pairs, etc..

Karla_Ocampo 4E

Thank you so much!

Karla_Ocampo 4E

I think its best to just memorize them to be safe.

Karla_Ocampo 4E

Hi! I think it would be best if you do memorize them since theyre not on the formula sheet for the test.

Karla_Ocampo 4E

Hi! Yes since ionization energies decrease from top to bottom within a group. For example, also Fluorine also has a high ionization energy. Also, Cesium is said to have the lowest ionization energy.

Karla_Ocampo 4E

Hi! Yes I think that by determining the formal charge we are able to know and keep track of the electrons and thus it is important for predicting the reactivity. I think it is the best way to know if you have the most stable lewis structure.

Karla_Ocampo 4E

Hi! So there are two types of atomic bonds, ionic and covalent. A covalent bond is two non metals bonding together. An example of a covalent bond is water (H2O). An ionic bond is when a cation (metal) bonds with a anion (nonmetal). An example of an ionic bond is NaCl. I hope this helped!

Karla_Ocampo 4E

For number 6 part A, we need to use the DeBroglie wavelength equation right? I used it and got 1.5547 x 10^/34 m but im not sure if I used the right equation? and I also think I messed up the units so pls correct me if needed

Karla_Ocampo 4E

can anyone please help me with number 2? I got to dividing the molar mass of 667 by 30.024 and got 22? but i think its wrong because its such a large number. Thus my molecular formula so far is C22H44O22 ?? pls help

Karla_Ocampo 4E

Thank you very much!! This is so helpful

Karla_Ocampo 4E

Hi! So for drawing Lewis structures, you remove one electron for each + 1 charge, and add one electron for each -1 charge.

Karla_Ocampo 4E

I think there are only some we need to know, I think he listed them in class. I believe they were: H, He, Li, and Be.

Karla_Ocampo 4E

Hi! You can know this by using your periodic table, but be careful because hydrogen is a bit tricky.

Karla_Ocampo 4E

I don't think so, maybe just the visible light range and the general order of the spectrum.

Karla_Ocampo 4E

Hi! According to the book, the color of light depends on its frequency and wavelength; long wavelength radiation has a lower frequency than short wavelength radiation (p6, edition6).

Karla_Ocampo 4E

Hi everyone! Im studying chapter 1 (edition 6) and I came across example 1.1 which is calculating the wavelength of light of a known frequency.My question is: which numbers do i plug into the formula for C (the speed of light)? I know its 3 x 10^8 m/s but the example used 2.998 x 10^8 m/s. Is the mo...

Karla_Ocampo 4E

Hi! No, I think they will be given, and also certain formulas and the periodic table.

Karla_Ocampo 4E

Hi! According to my notes, light does act as both a wave and a particle. Hope this helps!

Karla_Ocampo 4E

No, I dont think we need to buy anything from the student store

Karla_Ocampo 4E

Hi Gabby!
Dont even apologize! My high school chemistry class didn't teach me anything either so same. So to answer your question, combustion problems will always need O2 as a reactant and H2O and CO2 as the products. Then you just continue to balance the equation and so on. I hope this helped!

Karla_Ocampo 4E

What do you do with a dead chemist?
"Barium" (Ba)

Karla_Ocampo 4E

Hi! Thank you for posting this as I was too confused on which to use. However now I know that they have the same meaning but they are just written differently. So, in g.mol ^-1 , the -1 is supposed to be the denominator, which turns out to be the same as g/mol. Really it just comes down to your pref...

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Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]

Re: Strong Acids

Re: Total Charge

Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]

Re: Coordination Number

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Re: Coordination number

Re: Polar vs Nonpolar molecules

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Re: Week 7 Discussion Notes (3A, 3I, 3K)

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Re: Drawing Lewis Structures with Charges

Re: do we nee to memorize the octet exceptions?

Re: Lowest Ionization Energy [ENDORSED]

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Calculating the wavelength of light

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