Search found 39 matches

by Lusin_Yengibaryan_2A
Tue Nov 17, 2020 11:05 pm
Forum: Dipole Moments
Topic: Hybridization
Replies: 1
Views: 11

Hybridization

How do we determine the hybridization of an element in a given set of molecules or ions?
by Lusin_Yengibaryan_2A
Tue Nov 17, 2020 10:55 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Finding negative pole of a molecule
Replies: 3
Views: 19

Finding negative pole of a molecule

How would we go about finding where the negative pole of a given molecule is? For example, how would we solve a problem given the lewis structures of the molecules?

Also, how do we figure out which molecule should have the higher dipole moment when given two lewis structures of molecules?
by Lusin_Yengibaryan_2A
Tue Nov 17, 2020 10:52 pm
Forum: Bond Lengths & Energies
Topic: Sapling problem #16 (Homework week 7/8) [ENDORSED]
Replies: 1
Views: 27

Sapling problem #16 (Homework week 7/8) [ENDORSED]

Which of the species contains a π bond?

H2O

HCN

CO2−3

O3
Which of the species contains a delocalized π bond?

CO2−3

H2O

HCN

O3

What is a pi bond and how would we go about finding a delocalized pi bond? What is the difference between a regular pi bond and a delocalized pi bond?
by Lusin_Yengibaryan_2A
Tue Nov 17, 2020 10:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Questions
Replies: 1
Views: 28

Final Questions

Can you please go over how the final will be structures? How will the final be administered? Will it be similar to how the midterms have been administered? Will we have the whole three hours that the CCLE date states, on December 13th from 11:30-2:30? Also, approximately how many questions will be o...
by Lusin_Yengibaryan_2A
Tue Nov 17, 2020 10:02 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: sapling question 7 (homework week 7/8)
Replies: 2
Views: 10

sapling question 7 (homework week 7/8)

Which of these molecules are polar?

CH2Cl2

SO2

CO2

PCl3

How do we figure out which molecule is polar if we're given the lewis structures?
by Lusin_Yengibaryan_2A
Tue Nov 17, 2020 9:59 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Determining Polarity
Replies: 6
Views: 26

Determining Polarity

I'm still pretty confused on how to determine which atom in a molecule is polar. I would also like a simpler definition of polarity in a more easily-understandable way. What's a good analogy for polarity?
by Lusin_Yengibaryan_2A
Tue Nov 10, 2020 10:55 pm
Forum: Lewis Structures
Topic: Bond lengths and lewis structures
Replies: 1
Views: 12

Bond lengths and lewis structures

How do we determine whether the lewis structure of an ion is plausible given the bond lengths between the individual molecules?
by Lusin_Yengibaryan_2A
Tue Nov 10, 2020 10:49 pm
Forum: Lewis Structures
Topic: Finding Lewis Structure based on oxidation numbers
Replies: 2
Views: 42

Finding Lewis Structure based on oxidation numbers

How do we determine what Lewis structure of an ion is most plausible based on the oxidation number we find for that ion? Assuming that lone pairs belong to the atom to which they are attached but that all electrons shared in a bond belong to the more electronegative atom.
by Lusin_Yengibaryan_2A
Tue Nov 10, 2020 10:46 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Ionic Structures
Replies: 6
Views: 28

Ionic Structures

How do we determine based on the formal charges which Lewis structures are plausible?
by Lusin_Yengibaryan_2A
Tue Nov 10, 2020 10:44 pm
Forum: Dipole Moments
Topic: Dipole-dipole and london-dispersion IMF
Replies: 7
Views: 30

Dipole-dipole and london-dispersion IMF

How do we distinguish between dipole-dipole forces and London dispersion forces. There are some confusing bonds and I can't seem to find a pattern for these two forces. I'm only able to understand the hydrogen bonding FON/NOF bonds because of this pattern/abbreviation? If you know a pattern for dist...
by Lusin_Yengibaryan_2A
Tue Nov 10, 2020 10:40 pm
Forum: Dipole Moments
Topic: Week 5/6 Sapling Question
Replies: 4
Views: 42

Week 5/6 Sapling Question

Urea is an organic compound widely used as a fertilizer. Its solubility in water allows it to be made into aqueous fertilizer solutions and applied to crops in a spray. What is the maximum theoretical number of water molecules that one urea molecule can hydrogen bond with? Ignore shape for the purpo...
by Lusin_Yengibaryan_2A
Fri Nov 06, 2020 3:09 pm
Forum: Electronegativity
Topic: Electron Affinity
Replies: 6
Views: 25

Electron Affinity

I was wondering what would happen physically if an electron is added to a noble gas? What's one example of this reaction and what is the outcome?
by Lusin_Yengibaryan_2A
Fri Nov 06, 2020 3:06 pm
Forum: Octet Exceptions
Topic: Radicals
Replies: 5
Views: 35

Re: Radicals

Also, it's good to note that some food supplements such as vitamin C and E react with radicals before they damage it. Radicals are also highly reactive, which is why some foods that have radical properties can cause an upset stomach.
by Lusin_Yengibaryan_2A
Fri Nov 06, 2020 3:02 pm
Forum: Ionic & Covalent Bonds
Topic: More Covalent Character
Replies: 2
Views: 26

Re: More Covalent Character

In my understanding, increasing covalent. character makes the molecule less soluble since the size of the anion increases. This also means that the atom becomes less like a salt as you increase the atomic radius.
by Lusin_Yengibaryan_2A
Fri Nov 06, 2020 3:00 pm
Forum: Resonance Structures
Topic: Bond lengths
Replies: 20
Views: 80

Bond lengths

When drawing lewis structures, do we have to draw the double bond shorter than the single bonds? If so, why is this the case?
by Lusin_Yengibaryan_2A
Fri Nov 06, 2020 2:57 pm
Forum: Resonance Structures
Topic: resonance structures
Replies: 8
Views: 33

resonance structures

Can someone please explain how resonance structures work and what they mean in a chemical reaction and compound?
by Lusin_Yengibaryan_2A
Fri Oct 30, 2020 10:30 pm
Forum: Trends in The Periodic Table
Topic: Ionization energy
Replies: 4
Views: 45

Ionization energy

Why does oxygen have a lower first ionization energy than both nitrogen and fluorine? How do we determine reasons for ionization energy differences?
by Lusin_Yengibaryan_2A
Fri Oct 30, 2020 10:06 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Using quantum numbers to find number of electrons
Replies: 4
Views: 45

Using quantum numbers to find number of electrons

If you are given the quantum numbers for n, l, and m sub l, how would you go about finding the number of electrons in the atom?

For example:
n=7, l=2, m sub l=-1
by Lusin_Yengibaryan_2A
Fri Oct 30, 2020 9:37 pm
Forum: *Particle in a Box
Topic: Enthalpy of Fusion
Replies: 1
Views: 34

Enthalpy of Fusion

How many photons with a wavelength of 713 nm are needed to melt 459 g of ice? How would we use enthalpy of fusion to go about solving this problem? What steps are required to answer this question? I don't believe it was discussed in lecture.
by Lusin_Yengibaryan_2A
Wed Oct 28, 2020 7:41 pm
Forum: Einstein Equation
Topic: Solving Equations using E=hv
Replies: 3
Views: 53

Solving Equations using E=hv

How would you go about finding the frequency of a mole of photons given the energy of the said mole of photons?
by Lusin_Yengibaryan_2A
Mon Oct 26, 2020 1:18 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Spectral Lines
Replies: 2
Views: 20

Spectral Lines

How do we find the number of spectral lines for an atomic spectroscopy problem?
by Lusin_Yengibaryan_2A
Fri Oct 23, 2020 8:16 pm
Forum: *Black Body Radiation
Topic: Calculating Number of photons
Replies: 2
Views: 59

Calculating Number of photons

How would we go about calculating the number of photons required for a liquid to absorb some amount of Joules of heat if we are only given wavelength and the part of the electromagnetic spectrum to which it belongs?
by Lusin_Yengibaryan_2A
Thu Oct 22, 2020 11:29 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra Post-Module Assessment
Replies: 4
Views: 48

Atomic Spectra Post-Module Assessment

For the hydrogen atom which statement is true? The transition from n = 5 to n = 3 involves greater energy than one from n = 4 to n = 2. The transition from n = 4 to n = 2 emits radiation of longer wavelength than the transition from n = 5 to n = 1. All transitions from states for which n > 1 to the ...
by Lusin_Yengibaryan_2A
Thu Oct 22, 2020 12:47 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Absorption Spectrum
Replies: 3
Views: 22

Atomic Absorption Spectrum

In an atomic absorption spectrum what does one line (one wavelength) represent? In an atomic emission spectrum what does one line (one wavelength) represent?
by Lusin_Yengibaryan_2A
Wed Oct 21, 2020 11:02 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: H-atom
Replies: 1
Views: 33

H-atom

Do the calculated energies for the hydrogen atom compare favorably with empirical observation (spectroscopic results)?
by Lusin_Yengibaryan_2A
Wed Oct 21, 2020 3:10 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Midterm 1
Replies: 5
Views: 58

Midterm 1

Will wave functions and atomic orbitals be on midterm 1? If so, will they be a big focus or a small portion (maybe 1 question on it) of the exam?
by Lusin_Yengibaryan_2A
Wed Oct 21, 2020 2:53 pm
Forum: *Shrodinger Equation
Topic: Midterm 1 [ENDORSED]
Replies: 3
Views: 96

Midterm 1 [ENDORSED]

Will Schrodinger's equation be a main focus on midterm 1? Will there be any questions on it and if so, will there be multiple questions on it? How well do we need to know this concept for the purposes of midterm 1?
by Lusin_Yengibaryan_2A
Wed Oct 21, 2020 2:50 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Midterm 1
Replies: 18
Views: 189

Midterm 1

Will the Heisenberg indeterminacy equation be a focus on midterm 1? Will there be more than one question on it? How well do we need to know it for the purposes of midterm 1?
by Lusin_Yengibaryan_2A
Mon Oct 19, 2020 7:23 pm
Forum: Properties of Light
Topic: Properties of Light
Replies: 5
Views: 25

Re: Properties of Light

Yes, I meant c=lamda * v, but I thought h looked the closest to lamda since I couldn't type lamda on my keyboard.
by Lusin_Yengibaryan_2A
Mon Oct 19, 2020 1:52 pm
Forum: Properties of Light
Topic: Properties of Light
Replies: 5
Views: 25

Properties of Light

Is c=hv describing the photoelectric effect or some other experiment?
by Lusin_Yengibaryan_2A
Mon Oct 19, 2020 1:45 pm
Forum: Properties of Light
Topic: Photoelectric Experiment
Replies: 2
Views: 31

Photoelectric Experiment

If long wavelength light is not ejecting electrons from a metal surface will increasing the intensity of the light result in electrons being ejected?
by Lusin_Yengibaryan_2A
Mon Oct 19, 2020 1:42 pm
Forum: Properties of Electrons
Topic: Photoelectric Experiment
Replies: 2
Views: 15

Photoelectric Experiment

What was the photoelectric experiment originally designed to do?
by Lusin_Yengibaryan_2A
Mon Oct 19, 2020 1:37 pm
Forum: Photoelectric Effect
Topic: Photoelectric Experiment
Replies: 6
Views: 47

Photoelectric Experiment

Does the photoelectric experiment need to be done under a vacuum?
by Lusin_Yengibaryan_2A
Mon Oct 19, 2020 1:36 pm
Forum: Properties of Light
Topic: Photoelectric Experiment
Replies: 3
Views: 9

Photoelectric Experiment

What was the surprising factor of the photoelectric experiment?
by Lusin_Yengibaryan_2A
Fri Oct 09, 2020 9:51 pm
Forum: General Science Questions
Topic: Taking Notes on Textbook Readings
Replies: 13
Views: 103

Re: Taking Notes on Textbook Readings

What I try to do while reading is just to understand the examples and then focus on taking notes while watching the lectures.
by Lusin_Yengibaryan_2A
Fri Oct 09, 2020 9:41 pm
Forum: Student Social/Study Group
Topic: Regarding Quizzes
Replies: 5
Views: 44

Regarding Quizzes

I was wondering how quizzes are going to work? Will they be given during discussion sections or are they supposed to be completed prior to discussion? And how much of our grade will be based on them?
by Lusin_Yengibaryan_2A
Tue Oct 06, 2020 9:43 pm
Forum: General Science Questions
Topic: Regarding Homework
Replies: 3
Views: 45

Re: Regarding Homework

Thank you all for the clarification. :)
by Lusin_Yengibaryan_2A
Tue Oct 06, 2020 9:28 pm
Forum: General Science Questions
Topic: Regarding Homework
Replies: 3
Views: 45

Regarding Homework

I was wondering if the textbook assignments are mandatory or optional and if they can ever be used for extra points or if they'll ever be checked. I'd like to also know what the due date "due by midnight on Sunday" refers to. Is it Saturday evening at midnight which is technically already ...
by Lusin_Yengibaryan_2A
Tue Oct 06, 2020 9:25 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 200
Views: 141228

Regarding sig figs [ENDORSED]

Hello everyone. I was wondering how strict Dr. Lavelle is regarding sig figs and which value in a question do we use to base the rest of our sig figs on. Also, if we round our answers throughout the problem and get an answer very similar to the correct one in the end, will we still be given full cre...

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