Search found 35 matches

by Jade Corpus-Sapida 1G
Tue Jun 05, 2018 4:32 pm
Forum: Naming
Topic: 17.31 [ENDORSED]
Replies: 1
Views: 127

17.31 [ENDORSED]

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...
by Jade Corpus-Sapida 1G
Tue Jun 05, 2018 3:51 pm
Forum: Bronsted Acids & Bases
Topic: How to identify a Bronsted acid or base
Replies: 11
Views: 704

Re: How to identify a Bronsted acid or base

I would imagine from our lecture notes, that Bronsted refers to protons either being donated (acid) or accepted (base). While lewis refers to electrons.
by Jade Corpus-Sapida 1G
Tue Jun 05, 2018 3:47 pm
Forum: Hybridization
Topic: Regions of e- density: Tetrahedral vs. trigonal pyramidal
Replies: 3
Views: 105

Regions of e- density: Tetrahedral vs. trigonal pyramidal

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?
by Jade Corpus-Sapida 1G
Tue Jun 05, 2018 3:38 pm
Forum: Naming
Topic: Coordination Compound confusion [ENDORSED]
Replies: 4
Views: 294

Re: Coordination Compound confusion [ENDORSED]

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?
by Jade Corpus-Sapida 1G
Tue May 29, 2018 4:39 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Any Other Shapes?
Replies: 7
Views: 337

Re: Any Other Shapes?

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?
by Jade Corpus-Sapida 1G
Tue May 29, 2018 4:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Form vs. Shape
Replies: 2
Views: 71

Form vs. Shape

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?
by Jade Corpus-Sapida 1G
Tue May 29, 2018 4:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: single electron and shape
Replies: 3
Views: 83

Re: single electron and shape

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.
by Jade Corpus-Sapida 1G
Tue May 22, 2018 10:06 pm
Forum: Dipole Moments
Topic: Topics on Test 3
Replies: 2
Views: 102

Re: Topics on Test 3

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.
by Jade Corpus-Sapida 1G
Tue May 22, 2018 9:12 pm
Forum: Bond Lengths & Energies
Topic: 3.85 part b
Replies: 3
Views: 214

Re: 3.85 part b

or would this just be known by looking up these values in the back of the book/online? or can it be calculated?
by Jade Corpus-Sapida 1G
Tue May 22, 2018 9:11 pm
Forum: Bond Lengths & Energies
Topic: 3.85 part b
Replies: 3
Views: 214

3.85 part b

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...
by Jade Corpus-Sapida 1G
Sun May 20, 2018 7:05 pm
Forum: Lewis Structures
Topic: 3.49 part c
Replies: 2
Views: 67

Re: 3.49 part c

Oh I understand now. Thank you!
by Jade Corpus-Sapida 1G
Sun May 20, 2018 2:53 pm
Forum: Lewis Structures
Topic: 3.49 part c
Replies: 2
Views: 67

3.49 part c

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 ...
by Jade Corpus-Sapida 1G
Sat May 19, 2018 9:35 pm
Forum: Resonance Structures
Topic: Sulfate Lewis Structure
Replies: 2
Views: 143

Sulfate Lewis Structure

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...
by Jade Corpus-Sapida 1G
Sun May 13, 2018 12:01 am
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge of ClO2- [ENDORSED]
Replies: 4
Views: 464

Re: Formal charge of ClO2- [ENDORSED]

Also, just remember that the least electronegative element is the central one. In this case, Cl is less electronegative than oxygen.
by Jade Corpus-Sapida 1G
Sat May 12, 2018 6:01 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Calculating formal charges
Replies: 5
Views: 198

Re: Calculating formal charges

Theres another equation (which gives essentially the same answer) just in a different format:
FCelement=(# of valence e-)-(# of lone pair e- + 0.5(#bonding e-))
by Jade Corpus-Sapida 1G
Sat May 12, 2018 5:57 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Oxidation Number & Bonds
Replies: 6
Views: 222

Oxidation Number & Bonds

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...
by Jade Corpus-Sapida 1G
Sat May 05, 2018 11:57 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: homework 2.43 part e [ENDORSED]
Replies: 8
Views: 346

Re: homework 2.43 part e [ENDORSED]

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.
by Jade Corpus-Sapida 1G
Sat May 05, 2018 11:54 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configurations Exceptions
Replies: 3
Views: 84

Re: Electron Configurations Exceptions

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.
by Jade Corpus-Sapida 1G
Tue May 01, 2018 3:52 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.17
Replies: 4
Views: 128

Re: 2.17

okay thanks for the help!
by Jade Corpus-Sapida 1G
Tue May 01, 2018 3:06 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.17
Replies: 4
Views: 128

Re: 2.17

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?
by Jade Corpus-Sapida 1G
Tue May 01, 2018 1:19 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.17
Replies: 4
Views: 128

2.17

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?
by Jade Corpus-Sapida 1G
Wed Apr 25, 2018 9:01 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 4
Views: 198

Re: Rydberg Equation

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.
by Jade Corpus-Sapida 1G
Wed Apr 25, 2018 12:08 am
Forum: Photoelectric Effect
Topic: Frequency on Photoelectric Effect
Replies: 5
Views: 220

Re: Frequency on Photoelectric Effect

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...
by Jade Corpus-Sapida 1G
Sat Apr 21, 2018 4:25 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Finding velocity (delta)V [ENDORSED]
Replies: 2
Views: 88

Finding velocity (delta)V [ENDORSED]

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)?
by Jade Corpus-Sapida 1G
Tue Apr 17, 2018 7:55 pm
Forum: DeBroglie Equation
Topic: HW 1.39 [ENDORSED]
Replies: 8
Views: 379

Re: HW 1.39 [ENDORSED]

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.
by Jade Corpus-Sapida 1G
Tue Apr 17, 2018 7:49 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: h-bar [ENDORSED]
Replies: 7
Views: 273

h-bar [ENDORSED]

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?
by Jade Corpus-Sapida 1G
Sat Apr 14, 2018 2:36 pm
Forum: Photoelectric Effect
Topic: ENERGY PER MOLE OF PHOTONS [ENDORSED]
Replies: 3
Views: 125

Re: ENERGY PER MOLE OF PHOTONS [ENDORSED]

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?
by Jade Corpus-Sapida 1G
Sat Apr 14, 2018 2:25 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: 1.3 Atomic Spectra- Spectral lines
Replies: 4
Views: 81

Re: 1.3 Atomic Spectra- Spectral lines

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?
by Jade Corpus-Sapida 1G
Fri Apr 13, 2018 11:41 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: 1.3 Atomic Spectra- Spectral lines
Replies: 4
Views: 81

1.3 Atomic Spectra- Spectral lines

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?
by Jade Corpus-Sapida 1G
Tue Apr 10, 2018 11:19 pm
Forum: Significant Figures
Topic: Scientific notation [ENDORSED]
Replies: 7
Views: 379

Re: Scientific notation [ENDORSED]

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?
by Jade Corpus-Sapida 1G
Tue Apr 10, 2018 11:15 pm
Forum: Limiting Reactant Calculations
Topic: General Process [ENDORSED]
Replies: 3
Views: 176

Re: General Process [ENDORSED]

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...
by Jade Corpus-Sapida 1G
Tue Apr 10, 2018 11:02 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Formula Units
Replies: 6
Views: 2687

Re: Formula Units

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 ...
by Jade Corpus-Sapida 1G
Sun Apr 08, 2018 5:19 pm
Forum: Balancing Chemical Reactions
Topic: Balancing equations with fractions [ENDORSED]
Replies: 13
Views: 492

Re: Balancing equations with fractions [ENDORSED]

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...
by Jade Corpus-Sapida 1G
Fri Apr 06, 2018 11:19 am
Forum: Limiting Reactant Calculations
Topic: General Process [ENDORSED]
Replies: 3
Views: 176

General Process [ENDORSED]

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?
by Jade Corpus-Sapida 1G
Fri Apr 06, 2018 11:15 am
Forum: Molarity, Solutions, Dilutions
Topic: G.5 [ENDORSED]
Replies: 3
Views: 169

G.5 [ENDORSED]

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...

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