Search found 29 matches

by Sophia Fox 4B
Thu Dec 06, 2018 11:47 am
Forum: Bronsted Acids & Bases
Topic: Distinguishing bronsted acids vs bases
Replies: 3
Views: 29

Distinguishing bronsted acids vs bases

When given an equation (for ex: HNO2 + HPO4 ^2- <=> NO2^- + H2PO4^-), how can you tell which one is going to be the bronsted acid and which one will be the bronsted base? Especially if you weren’t given the products? I know that a bronsted acid is the proton donor and a bronsted base is a proton acc...
by Sophia Fox 4B
Thu Dec 06, 2018 11:41 am
Forum: Bronsted Acids & Bases
Topic: Donating H protons
Replies: 2
Views: 23

Re: Donating H protons

Yes
by Sophia Fox 4B
Sun Dec 02, 2018 2:22 pm
Forum: Administrative Questions and Class Announcements
Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Replies: 121
Views: 4211

Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]

Will you be posting a similar review sheet for the final?
by Sophia Fox 4B
Tue Nov 27, 2018 1:24 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability
Replies: 3
Views: 61

Re: Polarizability

Polarizability is how easily the electron cloud of an atom (usually a large anion) is distorted by another atom (usually a small highly charged cation). The atom causing the distortion (the cation) has polarizing power, which increases as the atom becomes smaller and more highly charged. The atom th...
by Sophia Fox 4B
Tue Nov 27, 2018 1:20 pm
Forum: Sigma & Pi Bonds
Topic: Pi bonds and hybridization
Replies: 2
Views: 26

Pi bonds and hybridization

Can pi bonds be hybridized? Since they're in a different plane than the sigma bonds I'm not sure. Also, are all sigma bonds hybridized?
by Sophia Fox 4B
Wed Nov 21, 2018 12:00 pm
Forum: Electronegativity
Topic: Electronegativity and Polarity
Replies: 3
Views: 36

Re: Electronegativity and Polarity

They’re inverses! As one inc, the other dec, and vice versa.
by Sophia Fox 4B
Wed Nov 21, 2018 11:56 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 5
Views: 31

Re: Molecular Shape

Yeah. Could help to make a table w the following columns (this is what I’m doing): # lone pairs | # bonding pairs | AXE formula | name | hybridization | drawing / description. Hope that helps.
by Sophia Fox 4B
Wed Nov 21, 2018 11:53 am
Forum: Sigma & Pi Bonds
Topic: sigma and pi bonds
Replies: 5
Views: 49

Re: sigma and pi bonds

Signs bonds are single bonds, they’re stronger, formed end to end, able to rotate. Pi bonds are the other bond(s) of the multiple bond, weaker, more easily breakable, formed side to side, not able to rotate.
by Sophia Fox 4B
Mon Nov 12, 2018 4:25 pm
Forum: Resonance Structures
Topic: Drawing resonance
Replies: 17
Views: 181

Re: Drawing resonance

Yes draw all resonance structures and then double sided arrows between them indicating that there is resonance.
by Sophia Fox 4B
Mon Nov 12, 2018 4:22 pm
Forum: Formal Charge and Oxidation Numbers
Topic: 3.53 6th edition
Replies: 4
Views: 72

Re: 3.53 6th edition

Not quite sure what the molecules were but generally you find the formal charge of EACH element in the molecule (use the eq that the person said above) and then add them up to find the charge of the molecule. Each element should have the lowest formal charge possible (you can change it by moving the...
by Sophia Fox 4B
Sun Nov 04, 2018 12:24 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 7th edition 2A.11
Replies: 1
Views: 27

7th edition 2A.11

7th edition 2A.11: Which M^3+ ions (where M is a metal) are predicted to have the following ground state electron configurations: (a) [Ar]3d^6, (b) [Ar]3d^5. I thought the answer to a was Cu^3+, and that the answer for b was Ni^3+, but the answer key says that a is Co^3+ and b is Fe^3+. I really can...
by Sophia Fox 4B
Fri Nov 02, 2018 9:37 am
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge purpose
Replies: 33
Views: 794

Re: Formal charge purpose

What does a non-zero formal charge mean, besides that the molecule isn't in its most stable state? Do the numbers actually mean anything?
by Sophia Fox 4B
Fri Nov 02, 2018 9:33 am
Forum: Einstein Equation
Topic: Calculating number of photons emitted
Replies: 3
Views: 118

Re: Calculating number of photons emitted

E = hv is energy for one photon. You need to be given total energy of light source in order to find number of photons. Divide the total energy of light by the energy per photon to find number of photons. Remember number of photons determines intensity of light, not energy per photon.
by Sophia Fox 4B
Fri Nov 02, 2018 9:27 am
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Replies: 135
Views: 23809

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

Hi! Can you post the 4th worksheet key? And also do you have a worksheet with more Lewis Structures practice?
by Sophia Fox 4B
Sat Oct 27, 2018 3:46 pm
Forum: Trends in The Periodic Table
Topic: 7th edition 1F.3
Replies: 2
Views: 34

7th edition 1F.3

How would you figure this out? "Place the following ions in order of increasing ionic radius: S^2-, Cl^-, P^3-." Its 7th edition 1F.3. Thanks!
by Sophia Fox 4B
Thu Oct 25, 2018 11:24 pm
Forum: Photoelectric Effect
Topic: Conditions that allow electron to be ejected from metal surface
Replies: 12
Views: 183

Re: Conditions that allow electron to be ejected from metal surface

correct. the energy of the photon must be greater than or equal to the work function of the specific metal (the minimum amount of energy needed to eject an e-) in order to eject an e-. if the energy of the photon is less than the work function of the metal, no e- will be ejected. if the energy of th...
by Sophia Fox 4B
Thu Oct 25, 2018 11:20 pm
Forum: Properties of Electrons
Topic: Electron Energy
Replies: 3
Views: 125

Re: Electron Energy

I think you're asking two question here. The energy changes when the electron goes from 1s to 2p because the principle quantum number, which corresponds to size and energy, is changing from n = 1 to n = 2. For hydrogen, the orbitals in a certain energy level (ie: n = 1 or n = 2 or n = 3, etc) are de...
by Sophia Fox 4B
Thu Oct 25, 2018 11:16 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Calculating Uncertainty in Momentum
Replies: 3
Views: 90

Re: Calculating Uncertainty in Momentum

use diameter for calculating uncertainty in position (delta x) because the diameter encompasses the whole area that the electron could be located. yes, your calculation for the uncertainty in position in that problem is correct. in that case you're finding a more specific area than just the diameter.
by Sophia Fox 4B
Thu Oct 18, 2018 2:30 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Bohr condition explaining lines
Replies: 2
Views: 42

Bohr condition explaining lines

How does the Bohr frequency condition explain the lines in the spectrum of an element? Thanks
by Sophia Fox 4B
Thu Oct 18, 2018 2:28 pm
Forum: Properties of Light
Topic: Wave/particles
Replies: 5
Views: 46

Re: Wave/particles

One specific example regarding how light can be wave and particle is the intensity. In the wave model, the intensity is the amplitude squared, but in the particle model the intensity is the number of photons. Hope this helps.
by Sophia Fox 4B
Thu Oct 18, 2018 2:25 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra
Replies: 4
Views: 42

Re: Atomic Spectra

Since energy is directly proportional to frequency, its inversely related to wavelength (c = wavelength x freq and E = planks constant (h) x freq ==> derive (E = hc/wavelength) by plugging in for freq). There is a greater change in energy from n =5 to n = 1 than n = 4 to n = 2, so the transition fro...
by Sophia Fox 4B
Thu Oct 18, 2018 2:19 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectroscopy vs Molecular Spectroscopy
Replies: 2
Views: 28

Atomic Spectroscopy vs Molecular Spectroscopy

Whats the difference between atomic spectroscopy and molecular spectroscopy? On Dr. Lavelle's syllabus it says "understand the difference bt electronic transitions in atomic orbitals (atomic spectroscopy) and electronic transitions in molecular orbitals (molecular spectroscopy)." What does...
by Sophia Fox 4B
Tue Oct 09, 2018 8:22 pm
Forum: Balancing Chemical Reactions
Topic: 7th edition L.35
Replies: 5
Views: 158

Re: 7th edition L.35

There's a typo in the third equation. The reactant should be the same as the product of the second reaction: Fe3Br8. Hope this helps!
by Sophia Fox 4B
Tue Oct 09, 2018 8:18 pm
Forum: Empirical & Molecular Formulas
Topic: Going from empirical to Molecular formula
Replies: 14
Views: 266

Re: Going from empirical to Molecular formula

The factor that you get after dividing the molecular mass by the empirical mass should be an integer, or really close (I think if you can round from the hundredths place to an integer it's close enough). If you don't get an integer than re-check the empirical formula or empirical mass. It's really e...
by Sophia Fox 4B
Tue Oct 09, 2018 8:12 pm
Forum: Molarity, Solutions, Dilutions
Topic: Question G13 (Sixth Edition)
Replies: 3
Views: 112

Re: Question G13 (Sixth Edition)

Hi! I just posted this same answer on another post but here goes: So first you have to isolate for Mf. Then you do (.2M * 1.0L)/(1+3L) to find the final molarity of the NH4NO3 solution, which is .05M. Once you have that, multiply by .1L (=100mL) to find how many moles of NH4NO3 for each plant, which...
by Sophia Fox 4B
Tue Oct 09, 2018 8:10 pm
Forum: Molarity, Solutions, Dilutions
Topic: Homework Problem in Section G
Replies: 3
Views: 80

Re: Homework Problem in Section G

So first you have to isolate for Mf. Then you do (.2M * 1.0L)/(1+3L) to find the final molarity of the NH4NO3 solution, which is .05M. Once you have that, multiply by .1L (=100mL) to find how many moles of NH4NO3 for each plant, which is .005 mol NH4NO3. Then use mole ratios to find the moles of jus...
by Sophia Fox 4B
Wed Oct 03, 2018 10:20 pm
Forum: Limiting Reactant Calculations
Topic: Combustion Analysis? [ENDORSED]
Replies: 7
Views: 101

Combustion Analysis? [ENDORSED]

Will combustion analysis be on the test? We haven't talked about it but it was in the limiting reactant section in the textbook (Fundamentals Section M3).
by Sophia Fox 4B
Wed Oct 03, 2018 10:17 pm
Forum: SI Units, Unit Conversions
Topic: Week 2 homework
Replies: 2
Views: 38

Re: Week 2 homework

Since we're starting on Quantum World lectures on Friday the homework for Week 2 will be from that section. My TA said just to turn in the problems that you know how to do if you haven't gone over everything in lecture yet. Hope this helps!
by Sophia Fox 4B
Wed Oct 03, 2018 10:12 pm
Forum: SI Units, Unit Conversions
Topic: Unit Notation
Replies: 2
Views: 48

Re: Unit Notation

It just makes it simpler to look at. The negative exponent and division sign mean the same thing but all of the /'s get confusing, so I prefer using the negative exponent method. It also helps with dimensional analysis bc the units are clearer.

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