Search found 33 matches

by KC Navarro_1H
Wed Jun 13, 2018 9:33 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating Ligand?
Replies: 3
Views: 171

Re: Chelating Ligand?

Chelates only apply to the ligand itself, right? Not the coordinate compound as a whole?
by KC Navarro_1H
Sat Jun 09, 2018 11:32 pm
Forum: Conjugate Acids & Bases
Topic: Conjugate Acids/Bases
Replies: 8
Views: 398

Conjugate Acids/Bases

If you determine a acid/base in a reaction based on whether or not it gains or loses an H+ proton, the conjugate acid/base is the opposite of the reactant acid/base and if the conjugate acid/base was added with water, you'd get back the original acid/base? Is this correct? Does anyone have any tips ...
by KC Navarro_1H
Fri Jun 08, 2018 4:40 pm
Forum: Lewis Structures
Topic: Valence Electrons for d-Block Elements?
Replies: 2
Views: 139

Re: Valence Electrons for d-Block Elements?

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 s...
by KC Navarro_1H
Fri Jun 08, 2018 4:39 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Lyman, Balmer, Paschen, Brackett. etc. series and Wavelength
Replies: 3
Views: 135

Lyman, Balmer, Paschen, Brackett. etc. series and Wavelength

I am aware that certain series correspond to certain wavelengths, but I'm not sure what would generally correspond to what. Should anything below 400 nm be considered as a Lyman series? And anything between 400-700nm should be considered as Balmer?

Thank you!
by KC Navarro_1H
Thu Jun 07, 2018 10:49 am
Forum: Lewis Structures
Topic: Valence Electrons for d-Block Elements?
Replies: 2
Views: 139

Valence Electrons for d-Block Elements?

For all elements in the d-block, do you also include the s orbital to determine valence electrons? In general, should we determine number of valence electrons from the shorthand version of the electron configuration?
by KC Navarro_1H
Sun Jun 03, 2018 4:00 pm
Forum: Hybridization
Topic: Differences Between Pi and Sigma bonds
Replies: 7
Views: 223

Differences Between Pi and Sigma bonds

What are some differences to remember between pi and sigma bonds? If I remember correctly, sigma bonds are more flexible than pi bonds, and double and triple bonds are made up of a mix of the two. What else is important to remember about them? Thank you!
by KC Navarro_1H
Sat Jun 02, 2018 10:17 pm
Forum: Hybridization
Topic: Filling Orbitals for Hybridization
Replies: 1
Views: 60

Filling Orbitals for Hybridization

When given examples of filling up orbitals for hybridization, I don't really understand how they're filled using the energy charts. Could someone please clarify on this? Thank you in advance!
by KC Navarro_1H
Sat Jun 02, 2018 10:08 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Define Ligands?
Replies: 10
Views: 316

Re: Define Ligands?

Thank you for the clarification! I'm not sure what questions they'd ask us about ligands for the final, but maybe they'd ask us to identify one?
by KC Navarro_1H
Thu May 31, 2018 10:50 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Define Ligands?
Replies: 10
Views: 316

Define Ligands?

I'm not entirely sure what a ligand is; we briefly covered this in class on Wednesday, but I don't really know how to point a ligand out. Could someone please clarify on this?
by KC Navarro_1H
Sun May 27, 2018 9:40 pm
Forum: Resonance Structures
Topic: Radicals
Replies: 3
Views: 191

Re: Radicals

An easy way for me to tell if a molecule is a radical is calculating the number of electrons for each element within the molecule. If the sum comes out odd, the molecule is a radical. For example, the molecule NO2 is a radical. Nitrogen (N) = 5 electrons Oxygen (O) = 6 electrons x 2 = 12 electrons 5...
by KC Navarro_1H
Sat May 26, 2018 10:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: AXE Notation and Shape
Replies: 4
Views: 220

AXE Notation and Shape

On Friday we learned that AX4E corresponds to the see-saw shape, etc. Is the AXE notation an identifier for every possible molecular shape? Additionally, are double/triple bonds taken into account when writing the AXE notation?
by KC Navarro_1H
Thu May 24, 2018 10:13 am
Forum: Bond Lengths & Energies
Topic: Shorter bond length always leads to stronger bond?
Replies: 5
Views: 647

Re: Shorter bond length always leads to stronger bond?

Yes, in general, a shorter bond length means a stronger bond. Atoms that are closer together are bonded more strongly to each other, and those that are far apart have a weak bond. Triple and double bonds are much stronger than single bonds because they are shorter, allowing the atoms to be closer to...
by KC Navarro_1H
Fri May 18, 2018 11:02 am
Forum: Dipole Moments
Topic: Defining "Distortion"
Replies: 1
Views: 278

Defining "Distortion"

(Sorry if I put this in the incorrect category, I wasn't sure where this would fit) I'm still trying to comprehend polarizability and polarizing power, though I do know that one applies to anions and the other applies to cations, respectively. I'm not entirely sure what "distortion" means;...
by KC Navarro_1H
Fri May 18, 2018 10:55 am
Forum: Lewis Structures
Topic: Finding a Lewis Structure with the Lowest Energy
Replies: 5
Views: 181

Re: Finding a Lewis Structure with the Lowest Energy

Yes, lowest energy means the structure that has a formal charge that's closest to zero. Thank you for all your responses!!
by KC Navarro_1H
Thu May 17, 2018 10:00 am
Forum: Lewis Structures
Topic: Finding a Lewis Structure with the Lowest Energy
Replies: 5
Views: 181

Finding a Lewis Structure with the Lowest Energy

I understand how to create Lewis Structures, though I was wondering if there were any quick methods to find the Lewis Structure with the lowest energy. Is it a matter of trial and error, where you calculate the formal charge each time, or are there some factors that we need to look out for to ensure...
by KC Navarro_1H
Sat May 12, 2018 2:55 pm
Forum: Lewis Structures
Topic: Charge and Structures
Replies: 2
Views: 91

Charge and Structures

When you find the charge of each atom in a molecule, should the sum of the formal charges match the charge of the molecule? Will this always happen or are there any exceptions?
by KC Navarro_1H
Tue May 08, 2018 2:31 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Velocity in Heisenberg Equation
Replies: 1
Views: 127

Velocity in Heisenberg Equation

I was just wondering if we ever use the main velocity in the Heisenberg Equation; what I mean is: v = 9.32 m/s ± 0.5 m/s Would we ever use 9.32 m/s? Would we ever just take the positive or negative values alone with the main velocity? I know we usually do 0.5 * 2, but I was just curious if we'd ever...
by KC Navarro_1H
Mon May 07, 2018 5:59 pm
Forum: Properties of Light
Topic: Keywords for Work Function or E_photon?
Replies: 4
Views: 202

Keywords for Work Function or E_photon?

What are some keywords to look out for if we need to find the Work Function or E_photon? For example, there are questions from last Friday's review session like: No electrons are emitted from the surface of the metal until the frequency of the radiation reaches 2.50 x 10^16 Hz. How much energy is re...
by KC Navarro_1H
Sat May 05, 2018 9:17 pm
Forum: Trends in The Periodic Table
Topic: Determining Smaller First Ionization Energy
Replies: 1
Views: 70

Re: Determining Smaller First Ionization Energy

First ionization energy refers to the amount of energy required to remove one electron; ionization energy itself just refers to the amount of energy to remove an electron, so it’s not totally different. However, as you remove more electrons, the second ionization energy becomes higher because it’s h...
by KC Navarro_1H
Fri May 04, 2018 11:01 am
Forum: Properties of Light
Topic: Higher Work Function and Electron Velocity?
Replies: 1
Views: 82

Higher Work Function and Electron Velocity?

For the photoelectric effect, what is the relationship between joules and ejected electron velocity? A quiz question that relates to this is: "The work function of silver is 6.83 x . 10^-19 J per atom. The work function of gold is 8.17 x 10^-19 J per atom. If the same light source shines on bot...
by KC Navarro_1H
Tue May 01, 2018 12:45 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration Orders?
Replies: 2
Views: 129

Electron Configuration Orders?

When doing electron configuration, do you have to keep the same n-values together? For example, I wrote the electron configuration for antimony (Sb) as: 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^3 Or [Kr] 5s^2 4d^10 5p^3 Would it be different if I grouped it by n-values? Like: 1s^2 2s^2...
by KC Navarro_1H
Sat Apr 28, 2018 9:20 pm
Forum: Properties of Electrons
Topic: Hydrogen Levels and Energy [ENDORSED]
Replies: 3
Views: 186

Hydrogen Levels and Energy [ENDORSED]

I'm sort of confused because I got marked down for this, but do electrons in hydrogen in lower n-levels (e.g. n = 1) have higher or lower energies than those in higher n-levels (e.g. n = 3)? Could someone clarify on this? I thought because the Lyman series includes ultraviolet light with lower wavel...
by KC Navarro_1H
Fri Apr 27, 2018 10:52 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Quiz #2 Question #2 B
Replies: 5
Views: 276

Re: Quiz #2 Question #2 B

Larger transitions like n=5 to n=3 yield lower wavelength with higher energy and smaller transitions like n=4 to n=3 yield the highest wavelength with the lowest energy. The reason for this is because bigger transitions give off more energy, so when an electron transitions to n=5 to n=3, it'd emit m...
by KC Navarro_1H
Fri Apr 27, 2018 10:35 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Test 2 Q4 help [ENDORSED]
Replies: 3
Views: 209

Re: Test 2 Q4 help [ENDORSED]

This one confused me at first because how it's written gives off the impression that it uses the E_n = -hR/n^2 equation at some point, but it just uses c = lambda * v and E = hv. Because the red colored flame is a result of the transition, it indicates that the transition has already been done and t...
by KC Navarro_1H
Sun Apr 22, 2018 9:13 pm
Forum: Properties of Light
Topic: Interference [ENDORSED]
Replies: 3
Views: 123

Re: Interference [ENDORSED]

To add onto Chem_Mod’s explanation, “in phase” means that two waves are aligned with each other and in the same pattern, “constructing” a bigger wave. “Out of phase” means that the two waves are unaligned, “destructing” the wave into a smaller one. A real life example would be some ocean waves. If t...
by KC Navarro_1H
Wed Apr 18, 2018 9:56 pm
Forum: Properties of Electrons
Topic: Remembering hydrogen spectral series and associated radiation
Replies: 2
Views: 137

Remembering hydrogen spectral series and associated radiation

The Lyman series is associated with ultraviolet light, the Balmer series is associated with visible light, etc.. For questions like 1.15 in the textbook where we have to figure out what series ultraviolet radiation is associated with, how can we easily remember these associations? If this kind of qu...
by KC Navarro_1H
Tue Apr 17, 2018 10:52 pm
Forum: Properties of Light
Topic: Negatives and Planck's Constant in finding the energy of a transitioning hydrogen atom?
Replies: 2
Views: 158

Negatives and Planck's Constant in finding the energy of a transitioning hydrogen atom?

I know that E_n = -hR/n^2 , and h = Planck's Constant but in the module video for Atomic Spectra, the h is taken away? Also, when you try to find the frequency or wavelength of radiation generated from the transition, are they supposed to remain negative or does the negative just go away? The exampl...
by KC Navarro_1H
Sun Apr 15, 2018 9:52 pm
Forum: Properties of Light
Topic: The Electromagnetic spectrum
Replies: 5
Views: 103

Re: The Electromagnetic spectrum

I don't think we'd have to memorize the electromagnetic spectrum if it were on a test and we have to put them in order, but if we had to calculate the energy of a particle, I think you'd use E = hv.
by KC Navarro_1H
Fri Apr 13, 2018 11:22 am
Forum: Properties of Light
Topic: Clarification on the Work Equation? (Photoelectric Effect) [ENDORSED]
Replies: 2
Views: 114

Re: Clarification on the Work Equation? (Photoelectric Effect) [ENDORSED]

I will discuss this in class tomorrow (Friday) in detail. Note: The "work function" is a measured value (not an equation). The work function is the (measured) energy required to remove an electron from a metal surface. The three energy terms are: 1. Energy of incoming photon (that interac...
by KC Navarro_1H
Thu Apr 12, 2018 3:37 pm
Forum: Properties of Light
Topic: Clarification on the Work Equation? (Photoelectric Effect) [ENDORSED]
Replies: 2
Views: 114

Clarification on the Work Equation? (Photoelectric Effect) [ENDORSED]

In the Photoelectric Effect module video, I was sort of confused as to how the work equation fits in with wavelength and frequency.

Specifically,

hv - Φ (Work Equation) = 1/2 (m_e- v_e-)^2 (Threshold Energy)

It might've been typed weirdly in the video, but how is this equation broken down?
by KC Navarro_1H
Sun Apr 08, 2018 3:52 pm
Forum: Administrative Questions and Class Announcements
Topic: Lecture Outlines [ENDORSED]
Replies: 2
Views: 92

Lecture Outlines [ENDORSED]

I know that how long we use a particular lecture outline depends on how much practice we need with the topic, but will we be notified when the outline changes? We're currently on Outline 1: Review of Chemical and Physical Principles.
by KC Navarro_1H
Sat Apr 07, 2018 9:38 pm
Forum: Balancing Chemical Reactions
Topic: Using the algebraic method on chemical equations that involve OH groups, etc. [ENDORSED]
Replies: 1
Views: 92

Using the algebraic method on chemical equations that involve OH groups, etc. [ENDORSED]

I have come across equations that involve N3, OH (as a hydroxyl group), and PO4. Problem H.6, part (d) (not a part of the homework problems) involves PO4: Ca3(PO4)2 (s) + SiO2 (s) + C (s) -delta-> CaSiO3 (l) + CO (g) + P4 (g) How would I use the algebraic method on this particular equation? Would I ...
by KC Navarro_1H
Fri Apr 06, 2018 9:17 pm
Forum: Significant Figures
Topic: Sig Figs in Calculations vs Sig Figs in the Question? [ENDORSED]
Replies: 1
Views: 84

Sig Figs in Calculations vs Sig Figs in the Question? [ENDORSED]

Hi!

I was wondering when you’re doing a multiplication/division calculation to find the number of grams, moles, etc., do you use the least amount of sig figs in the proposed question or the least amount of sig figs while you’re calculating the quantity?

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