Search found 31 matches

by janeane Kim4G
Wed Dec 05, 2018 4:02 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: What exactly is a ligand?
Replies: 2
Views: 43

What exactly is a ligand?

Exactly as the topic states, I have no idea what a ligand is and it’s significance/ what it’s used for. Does anyone have a simplified explanation for dummies?
by janeane Kim4G
Sun Dec 02, 2018 5:31 pm
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: Transition Metals
Replies: 5
Views: 187

Re: Transition Metals

to go further from the previous reply, the transitions metals belong in the d-block, meaning they are able to have more oxidation states than elements that do not. At this point, the electron shells do not have a lot of difference in energy like there was between the s and 2p orbitals.
by janeane Kim4G
Sun Dec 02, 2018 5:21 pm
Forum: Hybridization
Topic: Hybridization
Replies: 3
Views: 60

Re: Hybridization

Yes, an AX2E would be a liner structure, but you should also know that there are other VSEPR structures that translate to liner, for example AX2E3.
by janeane Kim4G
Sun Dec 02, 2018 5:18 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 4
Views: 68

Re: VSEPR

If you mean one central atom connected to two other atoms, the VSEPR would be AX2E. That means there are 3 regions of electron density, including the lone pair that you specified. However, if you mean 3 atoms by one central atom connected to 3 atoms with a lone pair on the central atom, then the str...
by janeane Kim4G
Tue Nov 27, 2018 10:08 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 3 material
Replies: 3
Views: 94

Test 3 material

Can someone provide a general outline of the material tested in test 3. Also, to make sure, will coordination compounds be on this test?
by janeane Kim4G
Sun Nov 25, 2018 2:42 am
Forum: Sigma & Pi Bonds
Topic: Which bond would break first.
Replies: 13
Views: 210

Which bond would break first.

Realistically, in a double bond of one pi and one sigma bond, which bond would break first? I would think it’s the pi bond, but I have no idea why, can someone elaborate?
by janeane Kim4G
Sun Nov 25, 2018 2:41 am
Forum: Sigma & Pi Bonds
Topic: Why are sigma bonds stronger than pi bonds?
Replies: 10
Views: 184

Why are sigma bonds stronger than pi bonds?

Since pi bonds have more than one area of interception, wouldn’t that mean the bonds formed form a pi bond would have more area of intersection and therefore more strength?
by janeane Kim4G
Sun Nov 25, 2018 2:25 am
Forum: Dipole Moments
Topic: 7th edition 3F.15 polarity and boiling points
Replies: 1
Views: 54

Re: 7th edition 3F.15 polarity and boiling points

You’re right, in this case the lone pair will lead to an uneven electron distribution, leading to polarity. AsF5 on the other hand has no lone pairs, therefore the charge and electron density is equally distributed, making it harder to break up the bonds.
by janeane Kim4G
Sun Nov 18, 2018 2:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Angular vs. Bent
Replies: 7
Views: 1030

Re: Angular vs. Bent

They’re the same thing
by janeane Kim4G
Sun Nov 18, 2018 2:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4 regions of electron density
Replies: 3
Views: 66

Re: 4 regions of electron density

When there are 4 regions of electron density, the molecule takes up a tetrahedral shape. The 2 lone pairs take up any 2 “spaces” in the shape. That leads to the molecule itself being a literal observed bent shape.
by janeane Kim4G
Mon Nov 12, 2018 3:46 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 3 dates?
Replies: 11
Views: 254

Re: Test 3 dates?

Thanks for clarifying! I was going off of the exam and test schedules link in the website, so maybe it was wrong.
by janeane Kim4G
Mon Nov 12, 2018 9:14 am
Forum: Administrative Questions and Class Announcements
Topic: Test 3 dates?
Replies: 11
Views: 254

Test 3 dates?

I noticed that test 3 is on the week on Nov 20, which is also thanksgiving week. For students with a dicussion on thursday or Friday, are we excpected to be there during the vacation weekend to take the test?
by janeane Kim4G
Sat Nov 10, 2018 1:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity and Molecular Shape
Replies: 1
Views: 83

Re: Polarity and Molecular Shape

yes! Polarity does affect the shape of the vsepr. This can best be observed between the difference in structure between CO2 and H2O. CO2 has C as the central atom and double bonds with the 2 Oxygen next to it. In this case, the C has no lone pairs and the poles are evenly distributed between the mol...
by janeane Kim4G
Sat Nov 10, 2018 1:09 pm
Forum: Dipole Moments
Topic: induced-dipole
Replies: 2
Views: 92

Re: induced-dipole

I think typically the dipole dipole is stronger mainly because it is only formed when there are permanent poles in molecules. In comparison, dispersion forces are due to instantaneous distortions of the electron cloud and can be observed in all molecules. I would imagine that there would be some mol...
by janeane Kim4G
Wed Nov 07, 2018 4:52 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: Dissociation energy
Replies: 3
Views: 63

Re: Dissociation energy

I don’t think a negative value is possible. A negative number would mean that energy is released when a bond is being broken, but energy is only released when bonds are formed.
by janeane Kim4G
Sun Nov 04, 2018 12:56 am
Forum: Photoelectric Effect
Topic: Calculating Wavelength of electron
Replies: 3
Views: 105

Re: Calculating Wavelength of electron

I haven’t done the computation for this lol but you’re right to use deBroglie, as the question isn’t for a photon
by janeane Kim4G
Tue Oct 30, 2018 4:12 pm
Forum: Resonance Structures
Topic: Resonance hybrids on the test?
Replies: 2
Views: 91

Resonance hybrids on the test?

Hello! Does anyone know if we are expected to write all the possible resonance structures for a certain resonance hybrid should they be questioned on the midterm. Would we be marked off for not drawing the structure that is most stable?
by janeane Kim4G
Tue Oct 30, 2018 4:07 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Perchlorate (ClO4)-
Replies: 7
Views: 799

Re: Perchlorate (ClO4)-

Can someone explain why 3 O would be double bonded with the Cl? Is there a way to determine if an element like Cl will/will not follow the octet guideline?
by janeane Kim4G
Tue Oct 30, 2018 4:02 pm
Forum: Lewis Structures
Topic: Dots in Lewis Stucture
Replies: 14
Views: 238

Re: Dots in Lewis Stucture

I don't believe it matters, as long as the amount of electrons are correct.
by janeane Kim4G
Mon Oct 29, 2018 11:31 pm
Forum: Ionic & Covalent Bonds
Topic: Likely ion charge for Ga?
Replies: 2
Views: 70

Likely ion charge for Ga?

This is part c of 2.15A asking for the likely charge for the ions formed from Ga. the answer is 3+, which makes it isoelectric to Ni. Does anyone know why Ga would not approach group 18 and likely become Ga3+ instead?
by janeane Kim4G
Tue Oct 23, 2018 2:51 pm
Forum: Einstein Equation
Topic: λ=h/p vs λ=hc/E
Replies: 6
Views: 268

Re: λ=h/p vs λ=hc/E

Hello! This first equation λ=h/p is the debroglie wave equation, it finds the hypothetical wavelengths of all items with a velocity and mass. λ= hc/E is the photon wavelength equation, used when measuring the energy of photons- note there is variable c, the speed of light, where λ=h/p does not. I do...
by janeane Kim4G
Tue Oct 23, 2018 2:44 pm
Forum: Photoelectric Effect
Topic: 34B Photoelectric effect module
Replies: 2
Views: 127

Re: 34B Photoelectric effect module

Hi, From the given wavelength, you can calculate the energy of the light with the equation E= hc/lambda (6.626*10^-34 Js)(3*10^8ms)/(194*10^-9m) = 1.023*10-18 J Recall that you found the work function ( E needed to eject an electron) in part A and that E(kinetic)= E(photon)-work function. Thus subtr...
by janeane Kim4G
Thu Oct 18, 2018 3:21 am
Forum: Photoelectric Effect
Topic: Module Post Assessment #34B
Replies: 2
Views: 53

Re: Module Post Assessment #34B

Hello! For this problem, you would use the equations frequency=c/wavelength, E=hv, and E(kinetic)=E(photon)-work function in that order. Use the first equation to and plug in the given 194 nm in correct units to find the frequency of the light ray: (3*10^8)/(1.94*10^-9 m)= 1.55*10^15 Hz Then, we can...
by janeane Kim4G
Mon Oct 15, 2018 1:02 am
Forum: Properties of Light
Topic: What does v stand for?
Replies: 1
Views: 66

Re: What does v stand for?

Hi! The v in (mass*velocity) stands for velocity, and the other v that you see is most likely the Greek letter nu, which looks like a slanted v and stands for the frequency.
by janeane Kim4G
Thu Oct 11, 2018 6:30 pm
Forum: Properties of Electrons
Topic: Mass of Electrons and Photons
Replies: 2
Views: 65

Re: Mass of Electrons and Photons

Agreed, the simple answer is that it is massless but with momentum and energy.
by janeane Kim4G
Tue Oct 09, 2018 9:22 am
Forum: Limiting Reactant Calculations
Topic: Help with M9?
Replies: 2
Views: 319

Re: Help with M9?

Thank you! This really helped
by janeane Kim4G
Tue Oct 09, 2018 2:17 am
Forum: Limiting Reactant Calculations
Topic: Help with M9?
Replies: 2
Views: 319

Help with M9?

“Copper (II) nitrate reacts with sodium hydroxide to produce a precipitate of light blue copper (II) hydroxide. A) write the net ionic equation for the reaction B) calculate the max mass of copper (II) hydroxide that can be formed when 2.00g of sodium hydroxide is added to 80.0 mL of .500M Cu(NO3)2?...
by janeane Kim4G
Tue Oct 02, 2018 3:14 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Moles!
Replies: 7
Views: 119

Re: Moles!

I have almost no chem experience so i might confuse you more lol but I got it down through the equations. Molar mass of an element is usually measured in g/mol. One mole is the # of atoms in 12g of carbon12, but it’s also Avogadro’s number. (6.02 x10^23). So for example, the molar mass of C on the p...
by janeane Kim4G
Tue Oct 02, 2018 2:48 pm
Forum: Student Social/Study Group
Topic: Anyone do G15 A?
Replies: 2
Views: 65

Anyone do G15 A?

Heya back with a molarity q, what volume of .778 M Na2CO3(aq) shouldbe diluted to 150.0 mL of water to make the concentration 0.0234 M NaCO3(aq)? How do you start/ approach problems like this?
by janeane Kim4G
Tue Oct 02, 2018 12:17 am
Forum: Molarity, Solutions, Dilutions
Topic: How to find volume of solution w specific amount of Na2CO3?
Replies: 2
Views: 119

How to find volume of solution w specific amount of Na2CO3?

It’s G5 part c on the 7th edition for reference. If a student has a 250mL solution of 2.111g of sodium carbonate, what volume of the solution should be transferred into a separate flask to obtain 50.0 mg of Na2CO3?
by janeane Kim4G
Mon Oct 01, 2018 9:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 96
Views: 30419

Re: Advice from a Medical Student [ENDORSED]

This is so helpful thank you :-,,)

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