Search found 34 matches

by Jasmine Ho 2H
Sun Nov 22, 2020 4:58 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Character
Replies: 28
Views: 77

Re: Covalent Character

Yes, all you really have to look at is the electronegativity difference between the two bonded atoms. The smaller the difference, the more covalent character.
by Jasmine Ho 2H
Sun Nov 22, 2020 4:09 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 17
Views: 55

Re: Polarity

If all of the dipole moments cancel out (by being of the same magnitude and in exact opposite directions), then the molecule will be nonpolar.
by Jasmine Ho 2H
Sun Nov 22, 2020 4:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity of BrF3
Replies: 6
Views: 31

Re: Polarity of BrF3

If you look at the Lewis structure for this molecule, you can see that there are 5 regions of e- density, and 3 of them are occupied by atoms. The regions of e- density are arranged in a trigonal bipyramidal shape, and the two lone pairs occupy 2 of regions in the equatorial plane. So, if you were t...
by Jasmine Ho 2H
Sun Nov 22, 2020 3:48 pm
Forum: Dipole Moments
Topic: Trans-dichloroethene
Replies: 5
Views: 11

Re: Trans-dichloroethene

It is nonpolar because the two dipoles are going in exact opposite directions. When you add two vectors of equal magnitude and that are opposite direction, they cancel each other out. In the case of cis-dichloroethene, you can see that both vectors are facing right (one to the top-right and one to t...
by Jasmine Ho 2H
Sun Nov 22, 2020 2:46 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Number of Molecular Shapes
Replies: 6
Views: 37

Re: Number of Molecular Shapes

I believe there's a table in the book or you can look up a VSEPR chart online and you should find everything you need!
by Jasmine Ho 2H
Sun Nov 15, 2020 8:49 pm
Forum: Resonance Structures
Topic: Sapling #9 part b
Replies: 2
Views: 9

Re: Sapling #9 part b

Since the observed bond length is very close to the expected length of a Cl=O bond, you know that the bond has greater Cl=O bond character than Cl--O bond character. So I just chose the models that had more Cl=O bonds than Cl--O bonds.
by Jasmine Ho 2H
Sun Nov 15, 2020 8:45 pm
Forum: Resonance Structures
Topic: resonance structures
Replies: 10
Views: 19

Re: resonance structures

The ones that contribute the most are the ones that have formal charges closer to zero for all of the atoms in the molecule because neutral atoms require the least energy and therefore are more stable.
by Jasmine Ho 2H
Sun Nov 15, 2020 7:56 pm
Forum: Bond Lengths & Energies
Topic: Sapling #4
Replies: 4
Views: 30

Re: Sapling #4

Essentially that question was just asking how close the observed bond lengths matched up with the expected lengths for a single or double bond. You could say it has ample bond character for all of the expected bonds because the observed lengths were between both and not very noticeably closer to one...
by Jasmine Ho 2H
Sun Nov 15, 2020 5:02 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Dipole-dipole vs Dipole-induced dipole
Replies: 5
Views: 17

Re: Dipole-dipole vs Dipole-induced dipole

Dipole-dipole interactions occur between two polar molecules (which have permanent dipoles). Dipole-induced dipole interactions occur between a polar molecule and a nonpolar molecule, where, say, if the positively charged end of the polar molecule comes close to one end of the nonpolar molecule, tha...
by Jasmine Ho 2H
Sun Nov 08, 2020 10:23 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charges and stability
Replies: 5
Views: 40

Re: Formal charges and stability

I think that since same charge particles repel each other, it would be lower energy if the charges were separated but I'm not completely sure.
by Jasmine Ho 2H
Sun Nov 08, 2020 10:09 pm
Forum: Quantum Numbers and The H-Atom
Topic: Pz Py Pz
Replies: 5
Views: 27

Re: Pz Py Pz

They are the three orbitals in the p (n=1) subshell.
by Jasmine Ho 2H
Sun Nov 08, 2020 5:40 pm
Forum: Octet Exceptions
Topic: 2C #15
Replies: 6
Views: 27

Re: 2C #15

The structure with the lowest energy would have formal charges closer to zero. However, I think it is also important to consider what charges are next to each other because two negatively charged atoms repel each other = more energy.
by Jasmine Ho 2H
Sun Nov 08, 2020 6:58 am
Forum: Resonance Structures
Topic: Valence Electrons
Replies: 28
Views: 88

Re: Valence Electrons

The number of valence electrons corresponds to that element's column in the periodic table, ignoring the entire d-block. So, any element in the 1st column has 1 valence electron; any element in the "5th" column (the column with N at the top) has 5 valence electrons, etc.
by Jasmine Ho 2H
Sun Nov 08, 2020 6:46 am
Forum: Ionic & Covalent Bonds
Topic: Octet rule exceptions
Replies: 15
Views: 67

Re: Octet rule exceptions

For H and He, it's because those only have electrons in the 1s orbital (H has 1, He has 2), so they cannot have a full octet. Not really sure about the other 2 to be honest, but thanks for reminding me to look into that!
by Jasmine Ho 2H
Sun Nov 08, 2020 6:41 am
Forum: Ionic & Covalent Bonds
Topic: atomic radius
Replies: 7
Views: 28

Re: atomic radius

I believe neighboring atoms just means 2 of the same atoms that are directly next to each other with no space in between.
by Jasmine Ho 2H
Sun Nov 01, 2020 5:44 pm
Forum: Trends in The Periodic Table
Topic: Electron Shielding Question
Replies: 3
Views: 20

Re: Electron Shielding Question

Essentially the physical pull on the electron by the positively charged nucleus is weaker on electrons in the outer layers. This means that the outermost electrons are more easily removed from an atom. For example, Ca has 2 electrons in the n=2 subshell, so those are shielded by the inner electrons ...
by Jasmine Ho 2H
Sun Nov 01, 2020 5:38 pm
Forum: DeBroglie Equation
Topic: Sapling HW question 15
Replies: 3
Views: 25

Re: Sapling HW question 15

You can use the de Broglie equation to get the velocity of an electron in the beam and then use the formula KE = (1/2)mv^2 and convert to eV.
by Jasmine Ho 2H
Sun Nov 01, 2020 5:02 am
Forum: Trends in The Periodic Table
Topic: Question about Ionization energy
Replies: 4
Views: 33

Re: Question about Ionization energy

Ionization energy is just the amount of energy to remove an electron from an atom in the gas phase. First ionization energy refers specifically to the amount of energy to remove the first electron to create a cation with a +1 charge, and second ionization energy is the amount needed to remove a seco...
by Jasmine Ho 2H
Sat Oct 31, 2020 3:11 am
Forum: Student Social/Study Group
Topic: How to relax
Replies: 97
Views: 365

Re: How to relax

I like to watch Netflix and listen to playlists and sometimes just stare at my ceiling for a little bit when I've been thinking for too long.
by Jasmine Ho 2H
Sun Oct 25, 2020 2:46 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Confusion with Uncertainty Values
Replies: 7
Views: 62

Re: Confusion with Uncertainty Values

Just wondering, but how come the uncertainty value is just 2x4 from 14.3 +/-4? If I were to write it out the long way, would it be since that the range is between 14.3-4 = 10 and 14.3 +4 = 18.3, and that the difference between the two is 8? I just need some clarification! I’m not sure where you got...
by Jasmine Ho 2H
Sun Oct 25, 2020 2:40 am
Forum: Properties of Light
Topic: Sapling problem
Replies: 6
Views: 74

Re: Sapling problem

For this problem, just know that the electron can move from n=6 to any lower energy level, meaning n=5, 4,3,2,1, which then gives 5 spectral lines. Then you find the energy of the n=6 to n=5 transition and get the wavelength for that photon, and do the same for the n=6 to n=1transition. Subtract the...
by Jasmine Ho 2H
Sun Oct 25, 2020 2:26 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Confusion with Uncertainty Values
Replies: 7
Views: 62

Re: Confusion with Uncertainty Values

Uncertainty is mainly about the range of values that the real value could be in. The actual value of the velocity doesn't really matter. For the question you specified, the uncertainty in velocity would be 4 m/s. Thank you for the clarification! I have a better understanding of it now. Do you know ...
by Jasmine Ho 2H
Fri Oct 23, 2020 1:04 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Sapling W 2,3,4 #12
Replies: 4
Views: 22

Re: Sapling W 2,3,4 #12

The steps you listed sound correct to me. Did you convert the wavelength from m to nm? That's all I can think of unless you maybe mixed up some variables.
by Jasmine Ho 2H
Fri Oct 23, 2020 12:58 am
Forum: Molarity, Solutions, Dilutions
Topic: Finding Formula of Unknown Molecule (Workshop)
Replies: 4
Views: 28

Re: Finding Formula of Unknown Molecule (Workshop)

I believe you made an error when you converted g of H2O to g of H because there are two H atoms in and H2O molecule. The mass of H should be double.
by Jasmine Ho 2H
Fri Oct 23, 2020 12:31 am
Forum: Empirical & Molecular Formulas
Topic: Amphetamine Formulas (Workshop Question)
Replies: 2
Views: 21

Re: Amphetamine Formulas (Workshop Question)

Yes it is since the mass of the empirical formula adds up to 135.21.
by Jasmine Ho 2H
Fri Oct 23, 2020 12:30 am
Forum: Molarity, Solutions, Dilutions
Topic: Arsenic Molarity Question
Replies: 1
Views: 24

Re: Arsenic Molarity Question

yes you did :)
by Jasmine Ho 2H
Sun Oct 18, 2020 2:51 am
Forum: Photoelectric Effect
Topic: Light Intensity
Replies: 23
Views: 75

Re: Light Intensity

Yes, the intensity of light is related to the number of photons! More photons = brighter light
by Jasmine Ho 2H
Sat Oct 17, 2020 3:07 am
Forum: Photoelectric Effect
Topic: Sapling homework
Replies: 2
Views: 44

Re: Sapling homework

yes!
by Jasmine Ho 2H
Fri Oct 16, 2020 2:50 am
Forum: Properties of Electrons
Topic: Week 2 Sapling HW #4
Replies: 2
Views: 28

Re: Week 2 Sapling HW #4

You were correct in finding the energy of the photon, but I think you made an error when subtracting E-K. Since it is approx. (8*10^-19 - 3*10^-19) you should get an answer closer to 5*10^-19 as your work function. Maybe you plugged in the wrong value for excess energy?
by Jasmine Ho 2H
Sat Oct 10, 2020 12:47 am
Forum: Molarity, Solutions, Dilutions
Topic: Question G.25 in Fundamentals
Replies: 2
Views: 34

Re: Question G.25 in Fundamentals

You are correct that moles of solute don't change when diluting a solution. The original 10 mL of solution contains .0010 mol of solute, and that number of moles stays the same throughout all 90 doublings of the volume. To find the final volume, you calculate 10*(2^90) , since one doubling is 10*2, ...
by Jasmine Ho 2H
Sat Oct 10, 2020 12:36 am
Forum: Balancing Chemical Reactions
Topic: Order of Balancing Rxns
Replies: 23
Views: 102

Re: Order of Balancing Rxns

I make a chart of every element for both reactants and products to keep track of how many of each element I have. I don't think I necessarily follow an order; I just go with what seems the most obvious at first, I think.
by Jasmine Ho 2H
Sat Oct 10, 2020 12:31 am
Forum: Limiting Reactant Calculations
Topic: Last Question on the Sapling Hw (Week 1)?
Replies: 12
Views: 128

Re: Last Question on the Sapling Hw (Week 1)?

You can multiply the volume of solution used in the reaction by the concentration of the solution (given in g/mL) to find out how many grams of 2-butanone was reacted, and then convert that mass to moles using the molar mass of 2-butanone. I assumed the equation was balanced, but you could check to ...
by Jasmine Ho 2H
Sat Oct 10, 2020 12:23 am
Forum: Empirical & Molecular Formulas
Topic: Chapter M Exercise 19
Replies: 4
Views: 32

Re: Chapter M Exercise 19

We can assume that the caffeine was burned in excess O2. 1) Convert the mass of caffeine into moles using the molar mass given 2) Convert the masses of the products into moles, and make sure to find the mass of each element. (ex. if there is 1 mol of water, there are 2 moles of hydrogen since there ...
by Jasmine Ho 2H
Tue Oct 06, 2020 11:41 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 221
Views: 115788

Re: Advice from a Medical Student [ENDORSED]

Thank you so much! I'll make sure to keep all of this in mind this year; this was incredibly comforting. :)

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