Search found 30 matches

by Ashita Tanwar 3H
Tue Dec 04, 2018 9:46 pm
Forum: Naming
Topic: Transition Metal Names
Replies: 1
Views: 54

Re: Transition Metal Names

The "ate" is only there when it is an anion. Otherwise it is just cobalt.
by Ashita Tanwar 3H
Tue Dec 04, 2018 9:28 pm
Forum: Naming
Topic: Transition Metal
Replies: 4
Views: 79

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?
by Ashita Tanwar 3H
Tue Dec 04, 2018 9:24 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: chelates
Replies: 5
Views: 132

Re: chelates

Can there be multiple rings around the same central atom?
by Ashita Tanwar 3H
Tue Nov 27, 2018 8:19 pm
Forum: Dipole Moments
Topic: Dipole
Replies: 2
Views: 71

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?
by Ashita Tanwar 3H
Tue Nov 27, 2018 8:16 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 7
Views: 349

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?
by Ashita Tanwar 3H
Tue Nov 27, 2018 8:13 pm
Forum: Hybridization
Topic: Hybridization/VSEPR
Replies: 1
Views: 74

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?
by Ashita Tanwar 3H
Sat Nov 24, 2018 12:43 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent - Lone Pairs
Replies: 8
Views: 228

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.
by Ashita Tanwar 3H
Sat Nov 24, 2018 12:41 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSPER Formula
Replies: 7
Views: 168

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?
by Ashita Tanwar 3H
Sat Nov 24, 2018 12:37 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 5
Views: 92

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?
by Ashita Tanwar 3H
Sat Nov 17, 2018 5:13 pm
Forum: Bond Lengths & Energies
Topic: Bond Lengths
Replies: 4
Views: 135

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!
by Ashita Tanwar 3H
Sat Nov 17, 2018 5:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR w/ more than 1 central atom
Replies: 2
Views: 203

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?
by Ashita Tanwar 3H
Sat Nov 17, 2018 5:04 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Formula for determining bond angle
Replies: 6
Views: 170

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?
by Ashita Tanwar 3H
Sat Nov 10, 2018 10:17 pm
Forum: Lewis Structures
Topic: Identifying the element
Replies: 8
Views: 199

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?
by Ashita Tanwar 3H
Sat Nov 10, 2018 10:12 pm
Forum: Electronegativity
Topic: Electron Affinity vs. Ionization Energy
Replies: 8
Views: 185

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...
by Ashita Tanwar 3H
Sat Nov 10, 2018 10:00 pm
Forum: Resonance Structures
Topic: Radicals
Replies: 11
Views: 460

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?
by Ashita Tanwar 3H
Sat Nov 03, 2018 3:56 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 4
Views: 115

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 :)
by Ashita Tanwar 3H
Sat Nov 03, 2018 3:49 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm study
Replies: 7
Views: 267

Re: Midterm study

Yes, there is a facebook groupchat for chem14A on Messenger! There's a link on the CO22 facebook page :)
by Ashita Tanwar 3H
Sat Nov 03, 2018 3:43 pm
Forum: Ionic & Covalent Bonds
Topic: 7th Edition 2A.11
Replies: 1
Views: 46

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?
by Ashita Tanwar 3H
Wed Oct 24, 2018 4:29 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Test 2 outline
Replies: 4
Views: 298

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!
by Ashita Tanwar 3H
Wed Oct 24, 2018 4:26 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 7
Views: 272

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...
by Ashita Tanwar 3H
Wed Oct 24, 2018 4:21 pm
Forum: DeBroglie Equation
Topic: DeBroglie Equation and experiment
Replies: 2
Views: 277

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!
by Ashita Tanwar 3H
Fri Oct 19, 2018 11:14 am
Forum: DeBroglie Equation
Topic: Measurable wavelike properties?
Replies: 2
Views: 82

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 :)
by Ashita Tanwar 3H
Fri Oct 19, 2018 11:11 am
Forum: DeBroglie Equation
Topic: Rest Mass v. Movement
Replies: 2
Views: 89

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?
by Ashita Tanwar 3H
Fri Oct 19, 2018 11:07 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Clarification on Heisenberg Equation
Replies: 2
Views: 74

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,...
by Ashita Tanwar 3H
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: 117

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
by Ashita Tanwar 3H
Sat Oct 13, 2018 5:49 pm
Forum: Einstein Equation
Topic: Energy of a Photon
Replies: 2
Views: 72

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
by Ashita Tanwar 3H
Sat Oct 13, 2018 5:45 pm
Forum: DeBroglie Equation
Topic: DeBroglie Equation
Replies: 5
Views: 129

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.
by Ashita Tanwar 3H
Wed Oct 03, 2018 11:57 pm
Forum: Significant Figures
Topic: Decimal point
Replies: 14
Views: 300

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!
by Ashita Tanwar 3H
Wed Oct 03, 2018 11:42 pm
Forum: Significant Figures
Topic: Sig Figs
Replies: 6
Views: 143

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?
by Ashita Tanwar 3H
Wed Oct 03, 2018 11:38 pm
Forum: Balancing Chemical Reactions
Topic: Net Ionic Equation?
Replies: 2
Views: 63

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 :)

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