Search found 30 matches
- Tue Dec 04, 2018 9:46 pm
- Forum: Naming
- Topic: Transition Metal Names
- Replies: 1
- Views: 110
Re: Transition Metal Names
The "ate" is only there when it is an anion. Otherwise it is just cobalt.
- Tue Dec 04, 2018 9:28 pm
- Forum: Naming
- Topic: Transition Metal
- Replies: 4
- Views: 228
Transition Metal
Is it possible for a coordination compound to have multiple transition metals? Or will there always only be one? If there are more, how would we name the metals?
- Tue Dec 04, 2018 9:24 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: chelates
- Replies: 5
- Views: 284
Re: chelates
Can there be multiple rings around the same central atom?
- Tue Nov 27, 2018 8:19 pm
- Forum: Dipole Moments
- Topic: Dipole
- Replies: 2
- Views: 133
Dipole
What are all the signs that indicate a molecule has dipole moments and how do you know where to draw them on the molecule?
- Tue Nov 27, 2018 8:16 pm
- Forum: Dipole Moments
- Topic: Polarity
- Replies: 7
- Views: 543
Re: Polarity
Also, how do you figure out if a molecule is polar if there are no lone pairs? Do you use the formal charges?
- Tue Nov 27, 2018 8:13 pm
- Forum: Hybridization
- Topic: Hybridization/VSEPR
- Replies: 1
- Views: 146
Hybridization/VSEPR
For hybridization, do we just have to be able to figure out the hybridization of molecules based on their VSEPR structure and leave it at that? Or can we use hybridization to generate more information about the molecule?
- Sat Nov 24, 2018 12:43 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent - Lone Pairs
- Replies: 8
- Views: 452
Re: Bent - Lone Pairs
Bond angles will be different because the repulsion between the pairs where there is one versus two lone pairs is significant enough to have an effect on the bond angles.
- Sat Nov 24, 2018 12:41 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSPER Formula
- Replies: 7
- Views: 467
Re: VSPER Formula
If the AXE formula is a template, does it change/become more specific when referring to a particular molecule? Or will it always be AXE?
- Sat Nov 24, 2018 12:37 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular Shape
- Replies: 5
- Views: 188
Re: Molecular Shape
Do the bond angles need to be memorized as well, or is there a formula that can determine what the angles are?
- Sat Nov 17, 2018 5:13 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Lengths
- Replies: 4
- Views: 254
Re: Bond Lengths
Also keep in mind that in molecules, double and triple bonds are decentralized so all the bonds in the molecule should be the same length!
- Sat Nov 17, 2018 5:11 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR w/ more than 1 central atom
- Replies: 2
- Views: 660
VSEPR w/ more than 1 central atom
Is it possible to use VSEPR theory with atoms with more than one central atom? If it is, how do you write the VSEPR formula for molecules with more than one central atom?
- Sat Nov 17, 2018 5:04 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Formula for determining bond angle
- Replies: 6
- Views: 330
Re: Formula for determining bond angle
Is it possible to tell which molecules have smaller bond angles even when we're not sure exactly what the bond angles are? Like would the size of the atoms in the molecule have an effect on the bond angles, or is it just a matter of how many / what kind of electron pairs there are?
- Sat Nov 10, 2018 10:17 pm
- Forum: Lewis Structures
- Topic: Identifying the element
- Replies: 8
- Views: 458
Re: Identifying the element
For questions like these, are we always supposed to assume that the formal charge of the molecule is 0? Will the formal charge be provided when it is something other than 0?
- Sat Nov 10, 2018 10:12 pm
- Forum: Electronegativity
- Topic: Electron Affinity vs. Ionization Energy
- Replies: 8
- Views: 447
Re: Electron Affinity vs. Ionization Energy
For the most part, electron affinity and ionization energy show the same trend across the periodic table. Fluorine has one of the greatest electron affinities and ionization energies, and these values decrease as you get closer to group 1/period 7. That being said, it's important to remember that el...
- Sat Nov 10, 2018 10:00 pm
- Forum: Resonance Structures
- Topic: Radicals
- Replies: 11
- Views: 855
Re: Radicals
For complex molecules that are radicals, how do you know which atom gets assigned the extra electron? Does it have to do with periodic trends?
- Sat Nov 03, 2018 3:56 pm
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 4
- Views: 242
Re: Electronegativity
We don't know how to calculate electronegativity, and for the most part it is determined in a lab setting anyway. If the elements are close together, then the values will likely be given. Otherwise we need to use our knowledge of periodic trends to determine the least/most electronegative element :)
- Sat Nov 03, 2018 3:49 pm
- Forum: Ionic & Covalent Bonds
- Topic: Midterm study
- Replies: 7
- Views: 427
Re: Midterm study
Yes, there is a facebook groupchat for chem14A on Messenger! There's a link on the CO22 facebook page :)
- Sat Nov 03, 2018 3:43 pm
- Forum: Ionic & Covalent Bonds
- Topic: 7th Edition 2A.11
- Replies: 1
- Views: 105
Re: 7th Edition 2A.11
I'm not 100% positive about this, but it's odd that the question asked for M^2+ ions and the answers are all M^3+ ions. Maybe it was a typo?
- Wed Oct 24, 2018 4:29 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Test 2 outline
- Replies: 4
- Views: 472
Re: Test 2 outline
No, electron configurations are Week 4 material, so they should be on the midterm/final and following test. We do need to know the wave function numbers though (n,l,m) and orbitals etc. Hope this helps!
- Wed Oct 24, 2018 4:26 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg Equation
- Replies: 7
- Views: 448
Re: Rydberg Equation
Does this mean that the equation given in the atomic spectra module always uses the lower energy level "n" as n1, regardless of whether it is the final or initial value? For example, if an electron was dropping from n=4 to n=2, then would the equation be the same if the electron was jumpin...
- Wed Oct 24, 2018 4:21 pm
- Forum: DeBroglie Equation
- Topic: DeBroglie Equation and experiment
- Replies: 2
- Views: 392
Re: DeBroglie Equation and experiment
Prof. Lavelle didn't explicitly go over any particular experiments that were important to De Broglie's equation, but it's important to remember that De Broglie waves can be experimentally observed in a lab setting. Hope this helps!
- Fri Oct 19, 2018 11:14 am
- Forum: DeBroglie Equation
- Topic: Measurable wavelike properties?
- Replies: 2
- Views: 170
Re: Measurable wavelike properties?
There are certain waves that are able to be detected/tested for in the lab setting and it just so happens that waves beyond 10^-18 are too small to be detected. That's why the cutoff is at 10^-18 :)
- Fri Oct 19, 2018 11:11 am
- Forum: DeBroglie Equation
- Topic: Rest Mass v. Movement
- Replies: 2
- Views: 169
Rest Mass v. Movement
Do objects that have no "rest mass" have mass when they are moving? Or do they just never have mass? How can the mass of an object change depending on its movement?
- Fri Oct 19, 2018 11:07 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Clarification on Heisenberg Equation
- Replies: 2
- Views: 146
Clarification on Heisenberg Equation
One TA told me that the reason there is uncertainty when determining the position/momentum of particles is because we can't take into account both the matter properties and wavelike properties of said particle, but I also heard that the uncertainty is because "by the time we calculate momentum,...
- Sat Oct 13, 2018 5:54 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Negative v. Positive when calculating energy
- Replies: 8
- Views: 410
Negative v. Positive when calculating energy
What does it mean when delta E turns out to be negative after calculating the energy difference between two energy levels? I'm not sure if the sign makes a difference
- Sat Oct 13, 2018 5:49 pm
- Forum: Einstein Equation
- Topic: Energy of a Photon
- Replies: 2
- Views: 140
Re: Energy of a Photon
The units for "E" are Joules/photon, so if we're using the equation for a situation that only involves one photon, there's no real difference. If there's more than one photon being discussed then you need to take into account that the answer is for only one photon
- Sat Oct 13, 2018 5:45 pm
- Forum: DeBroglie Equation
- Topic: DeBroglie Equation
- Replies: 5
- Views: 266
Re: DeBroglie Equation
Also, in class we used the equation on everyday objects like a baseball and car so it can be applied to pretty much any object that is moving, the only thing is that larger objects don't have wavelike properties that are measurable.
- Wed Oct 03, 2018 11:57 pm
- Forum: Significant Figures
- Topic: Decimal point
- Replies: 14
- Views: 537
Re: Decimal point
Both of the values have the same number of significant figures: 3 sig figs. Adding a decimal point is tricky when it comes to sig figs!
- Wed Oct 03, 2018 11:42 pm
- Forum: Significant Figures
- Topic: Sig Figs
- Replies: 6
- Views: 238
Re: Sig Figs
For questions like these, do the trailing zeroes count as sig figs? For example, do 400.00 and 400.0 have the same number of sig figs?
- Wed Oct 03, 2018 11:38 pm
- Forum: Balancing Chemical Reactions
- Topic: Net Ionic Equation?
- Replies: 2
- Views: 94
Re: Net Ionic Equation?
No, this topic shouldn't be on our first test because it wasn't included in the assigned Appendix pages or the outline for week 1. But it wouldn't hurt to review :)