CHEMISTRY COMMUNITY

Jade Corpus-Sapida 1G

In this problem, it asks to write the formula given the names in table 17.4. My question is regarding the use of "diaqua". In the table it says it is OH 2 , however in part c of the problem it writes it as (H 2 O) for tetraaminediaquacobalt (III) bromide. While in part d it goes back to us...

Jade Corpus-Sapida 1G

I would imagine from our lecture notes, that Bronsted refers to protons either being donated (acid) or accepted (base). While lewis refers to electrons.

Jade Corpus-Sapida 1G

If there are 4 regions of electron density, sp³, how would we know if it is tetrahedral shape or trigonal pyramidal? Or would we just have to draw the lewis structure to figure this out?

Jade Corpus-Sapida 1G

How are we supposed to know the names of the compounds? Do we just memorize them or is naming not going to be on the final?

Jade Corpus-Sapida 1G

Are the shapes in the front of chapter 4 the only shapes known in total? Or are they only few of the many shapes possible?

Jade Corpus-Sapida 1G

Whats the difference between a molecule's form and shape? I saw the post about water being bent and having a tetrahedral form. What is meant by form?

Jade Corpus-Sapida 1G

I would imagine that a single electron would just make the molecule unstable/reactive. I don't think it would drastically change the shape unless it was stated in class, but then I also googled it and it's giving me complicated answers.

Jade Corpus-Sapida 1G

Based on the website, it says that test 3 covers chapter 3 material. So I don't think the portion of chapter 6 will be on it unless stated otherwise.

Jade Corpus-Sapida 1G

or would this just be known by looking up these values in the back of the book/online? or can it be calculated?

Jade Corpus-Sapida 1G

In this problem it asks to arrange the following molecules/ions in order of decreasing lengths: SO 2 , SO 3 , and SO 3 2- . The answer is SO 3 2- > SO 2 ~SO 3 . I understand why SO 3 2- has the longest length, however I don't understand why the other two would have equal/same lengths? If this were t...

Jade Corpus-Sapida 1G

Oh I understand now. Thank you!

Jade Corpus-Sapida 1G

In this problem, it asks for the lewis structure and formal charge for CO. The correct answer has a triple bond between C and O (with a +1 charge on C and -1 charge on O), however I calculated the formal charge with double bond between the two and I also got 0 for both elements. Why is it incorrect ...

Jade Corpus-Sapida 1G

I have a question about the sulfate lewis structure that was in the 5/11/18 notes. The TA's did an example with sulfate and I was wondering if there are other resonance structures associated with it. For example, in sulfate they wrote that there are 2 single bonds and 2 double bonds. The 2 double bo...

Jade Corpus-Sapida 1G

Also, just remember that the least electronegative element is the central one. In this case, Cl is less electronegative than oxygen.

Jade Corpus-Sapida 1G

Theres another equation (which gives essentially the same answer) just in a different format:
FC_element=(# of valence e-)-(# of lone pair e- + 0.5(#bonding e-))

Jade Corpus-Sapida 1G

Hi, I was looking at other posts (from last year) about oxidation numbers (for example 3.23 in the book) and they said for Cl, the oxidation number could be +7 or -1 in order to reach an octet in bonds. When elements bond together, does the oxidation number used just depend on which elements are inv...

Jade Corpus-Sapida 1G

Vivian Gonzalez 1A wrote:I see. So the f block lies in between the 6s-7s and 5d/6d rows?

Yes it does. If you look at the periodic table there should be 2 boxes labelled "57-71 lanthanoids" and "89-103 actinoids", where that section leads to the portion below as an extension.

Jade Corpus-Sapida 1G

I think in class, Professor Lavelle mentioned that we would only be focusing on the first row of the d-block. So it would just be the Copper and Chromium exceptions.

Jade Corpus-Sapida 1G

okay thanks for the help!

Jade Corpus-Sapida 1G

okay, its starting to make sense now. However is the pattern always going to be l, l-1, -l? So it goes in both positive and negative directions?

Jade Corpus-Sapida 1G

In this problem we are given the l value, so then I solved for what n (energy level) is (l= n-1), but then I'm confused as to how the answers are
a) 1 orbital
b) 5 orbitals
c) 3 orbitals
d) 7 orbitals

does the value of n just relate to the different shapes?

Jade Corpus-Sapida 1G

Is the Rydberg equation always initial minus final? In my discussion we wrote it as final minus initial? Im a bit confused about which orientation is correct.

Jade Corpus-Sapida 1G

From lecture, I remember Professor Lavelle explaining the experiment where increasing the intensity of the light wouldn't eject any electrons. There is the need to increase the energy, and by increasing the energy is an increase in frequency. Waves with higher frequency have higher energy levels . S...

Jade Corpus-Sapida 1G

If a problem asks to find velocity using the Heisenberg equation, it seems that we typically have to find (delta)P and then divide by mass (m) (since momentum(delta)P= mass (m) x (delta)V). When we divide by mass, do we always assume it is the mass of the electron (9.11x10^-31 kg)?

Jade Corpus-Sapida 1G

I would think you would use wavelength= h/mv. Where h= plancks constant (Js), m=mass (g), v= velocity (m/s). At first convert ounces to grams and mph to m/s, then I would use the equation mentioned.

Jade Corpus-Sapida 1G

In the Heisenberg uncertainty equation, does h-bar basically mean plancks constant divided by 2pi? Will this number always be the same/constant or are there instances where its different?

Jade Corpus-Sapida 1G

I would imagine since 1 mole= 6.022x10^23 "things"/atoms, and photons contain packets of energy aka packets of electrons (absorbed or emitted). I may be wrong but this is how I interpreted it?

Jade Corpus-Sapida 1G

Oh okay, thank you! For the 2 different series (Balmer and Lyman), do these two series just represent/determines which portion of the spectrum you are looking at? Like visible light is within the Balmer series and the Lyman series are those in the UV region?

Jade Corpus-Sapida 1G

Hi,

I'm currently reading the section about spectral lines, etc. and I'm confused as to what "n" stands for? For example, the Rydberg equation has certain variables (n₁ and n₂). What do they represent?

Jade Corpus-Sapida 1G

In class, he also mentioned how we wouldn't get negatively impacted for the quizzes if we weren't to follow sig figs. I assume this may also apply to tests as well?

Jade Corpus-Sapida 1G

In my discussion section, I remember that we were taught another way of finding the limiting reactant. We first find the amount of moles from the masses (of each element) given and then divide by the coefficients in the balanced equation. The calculation with the smallest result ended up being the l...

Jade Corpus-Sapida 1G

Based off previous posts, formula units appear to be salts and/or the number of "objects"/"things" etc.? From the online definition: "A formula unit indicates the lowest whole number ratio of ions in an ionic compound." Units within the formula are atoms of the element ...

Jade Corpus-Sapida 1G

I think this idea is also similar to when we create the empirical formulas. The idea to keep the stoichiometric coefficients whole numbers. For example, if after dividing the moles of a particular element by the smallest number of moles there is still a fractional number, then you would also multipl...

Jade Corpus-Sapida 1G

With regard to limiting reagents, is it best to just test each reactant and relate it to the products? Or is there a simpler way to approaching these types of problems such as certain giveaways that will determine which reactant is limiting?

Jade Corpus-Sapida 1G

Can someone explain why in part a of G.5 theres the multiplying of Na2CO3 mol and dividing of Na moles such as: v= (2.15E-3 mol Na)(1 mol Na2CO3)/(0.0797 mol/L)(2 mol Na) ? I'm confused as I know the formula is Volume=mol/conc and I see that it's asking in relation to Na. But then theres the compoun...

CHEMISTRY COMMUNITY

Search found 35 matches

17.31 [ENDORSED]

Re: How to identify a Bronsted acid or base

Regions of e- density: Tetrahedral vs. trigonal pyramidal

Re: Coordination Compound confusion [ENDORSED]

Re: Any Other Shapes?

Form vs. Shape

Re: single electron and shape

Re: Topics on Test 3

Re: 3.85 part b

3.85 part b

Re: 3.49 part c

3.49 part c

Sulfate Lewis Structure

Re: Formal charge of ClO2- [ENDORSED]

Re: Calculating formal charges

Oxidation Number & Bonds

Re: homework 2.43 part e [ENDORSED]

Re: Electron Configurations Exceptions

Re: 2.17

Re: 2.17

2.17

Re: Rydberg Equation

Re: Frequency on Photoelectric Effect

Finding velocity (delta)V [ENDORSED]

Re: HW 1.39 [ENDORSED]

h-bar [ENDORSED]

Re: ENERGY PER MOLE OF PHOTONS [ENDORSED]

Re: 1.3 Atomic Spectra- Spectral lines

1.3 Atomic Spectra- Spectral lines

Re: Scientific notation [ENDORSED]

Re: General Process [ENDORSED]

Re: Formula Units

Re: Balancing equations with fractions [ENDORSED]

General Process [ENDORSED]

G.5 [ENDORSED]