Search found 30 matches

by jadam_1E
Sun Jun 10, 2018 9:24 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: ethylenediaminetetraacetato (edta)
Replies: 6
Views: 257

Re: ethylenediaminetetraacetato (edta)

edta is very important for one thing because it is the most common hexadentate ligand, meaning it can bind to a central metal atom in up to 6 locations.
by jadam_1E
Sun Jun 10, 2018 4:58 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands to Memorize for the Final
Replies: 2
Views: 107

Re: Ligands to Memorize for the Final

I created a quizlet that might help people with studying the ligands listed on page 742. https://quizlet.com/_4zgr1g
by jadam_1E
Sun Jun 10, 2018 4:52 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: 17.29
Replies: 2
Views: 107

Re: 17.29

A good way to think when calculating oxidation number for a complex is to consider all the bonding between the central metal atom and the ligands to be 100% ionic, so when finding the charge on a ligand, consider the ligand separate. For 12.29, this would mean considering each CN- to have a charge o...
by jadam_1E
Sun Jun 10, 2018 4:39 pm
Forum: Sigma & Pi Bonds
Topic: Pi bonds
Replies: 3
Views: 1565

Re: Pi bonds

Hi sylvie,
I know that a pi bond could also occur as a result of an overlap between orbitals that includes a hybridized orbital such as sp2 or sp3.
by jadam_1E
Sun Jun 10, 2018 4:30 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating complex
Replies: 7
Views: 189

Re: Chelating complex

The minimum number of ligands needed in order to form a chelating complex is 1, an important note: only polydentate ligands can form complexes.
by jadam_1E
Sun Jun 10, 2018 3:48 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: ethylenediaminetetraacetato (edta)
Replies: 6
Views: 257

Re: ethylenediaminetetraacetato (edta)

Hi Noah, A double bond is made of a sigma bond and a pi bond. Because of the pi bond, any atom with a double bond cannot rotate or bend--it is fixed so to say. This inability of the atom to reach toward the central metal atom prevents it from binding. So, the two oxygens in EDTA that have double bon...
by jadam_1E
Sat Jun 09, 2018 1:25 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Exact Bond Angle [ENDORSED]
Replies: 2
Views: 108

Determining Exact Bond Angle [ENDORSED]

Hi all, when determining the bond angle for a molecule that has, say, the VSEPR formula AX2E, meaning it has a bent shape with one lone electron pair, do we need to know the exact bond angle or is it enough to know that the bond angle will be less than 120 degrees because of the extra repelling forc...
by jadam_1E
Sat Jun 09, 2018 1:21 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent vs. Angular
Replies: 11
Views: 357

Re: Bent vs. Angular

Along these same lines, would it still be acceptable to say trigonal planar bent?
by jadam_1E
Sat Jun 09, 2018 1:16 am
Forum: Formal Charge and Oxidation Numbers
Topic: Perchlorate (ClO4)-
Replies: 7
Views: 2321

Re: Perchlorate (ClO4)-

A good general rule when calculating formal charge: make the formal charge on the central atom as close as possible to 0. Also, oxygen is more electronegative than cl so it makes sense for cl to have the additional electron.
by jadam_1E
Sat Jun 09, 2018 1:09 am
Forum: Photoelectric Effect
Topic: Visible or measurable light
Replies: 4
Views: 121

Re: Visible or measurable light

One of the most important things to remember for the visual spectrum that may show up on a test is that blue/violet have the lowest wavelength (close to 400nm) while red has the largest (around 700nm), which means blue light has higher energy than red light.
by jadam_1E
Sat Jun 09, 2018 12:55 am
Forum: Dipole Moments
Topic: Why can't SO2 form Hydrogen bonds?
Replies: 3
Views: 462

Re: Why can't SO2 form Hydrogen bonds?

I think this question is asking what intermolecular forces would arise between two SO2 molecules, given that there is no hydrogen in SO2, there would be no hydrogen bonding between two molecules of sulfur dioxide, which is why hydrogen bonding is not an answer. However, because SO2 does have oxygen ...
by jadam_1E
Fri Jun 08, 2018 11:46 pm
Forum: Dipole Moments
Topic: Are London dispersion forces present in every molecule?
Replies: 2
Views: 150

Re: Are London dispersion forces present in every molecule?

London dispersion forces exist between any two molecules provided that they are close enough together! They are a result of the electrons in one molecule attracting to the positively charged nuclei of another molecule (This means they are present in both polar and non polar molecules). These dispers...
by jadam_1E
Fri Jun 08, 2018 11:39 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Lyman, Balmer, Paschen, Brackett. etc. series and Wavelength
Replies: 3
Views: 136

Re: Lyman, Balmer, Paschen, Brackett. etc. series and Wavelength

The most definite way to assign a light wave to either the lyman or balman series is to look at the energy level change. If the spectral line emitted is a result of the energy level dropping from n≥2 to n=1 then it is a part of the Lyman series If the spectral line emitted is a result of the energy ...
by jadam_1E
Sun Jun 03, 2018 9:24 pm
Forum: Hybridization
Topic: Clarification
Replies: 4
Views: 221

Re: Clarification

Hi, If you could point out specific questions that relate to what your question is talking about that would help, but from my understanding this would mean to look at different types of molecules and how hybridization allows them to be formed ie CH4 is possible because Carbon has the 2SP3 hybridizat...
by jadam_1E
Sun Jun 03, 2018 9:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: polar and nonpolar molecules
Replies: 5
Views: 173

Re: polar and nonpolar molecules

A CH2CL2 molecule is tetrahedral because there are four regions of electron density (VSEPR Model Formula of AX4). The C-H and C-Cl bonds are both polar in nature and looking at a tetrahedral shape, no bonds are opposite eachother and hence no bonds will cancel, causing the molecule to be polar.
by jadam_1E
Sun Jun 03, 2018 8:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: hw 4.21 a
Replies: 2
Views: 108

Re: hw 4.21 a

The shape is called Trigonal Planar because there are two center atoms, each with 3 regions of electron density. The Shape of the molecule is thus more accurately two trigonal planar shapes.
by jadam_1E
Sat Jun 02, 2018 1:37 am
Forum: Hybridization
Topic: identifying hybridized v unhybridized
Replies: 1
Views: 251

Re: identifying hybridized v unhybridized

If you draw the Lewis structure of a molecule or formula unit then you can find the number of bonds that are responsible for the creation of the compound. Look at the number of unpaired electrons for the center atom in its ground state, ie Carbon's 2Px and 2Py orbitals have unpaired electrons. If th...
by jadam_1E
Sat Jun 02, 2018 1:24 am
Forum: Hybridization
Topic: Sigma and Pi bonds and its relation to atomic orbitals.
Replies: 1
Views: 70

Re: Sigma and Pi bonds and its relation to atomic orbitals.

Sigma and Pi bonds are related to atomic orbital, but I'm not sure it's how you're thinking about it. I'll relate my understanding of sigma and pi bonds. Thinking about the bond between nitrogen and nitrogen in N2, the 2 Nitrogen atoms are bound by a triple bond, with both Nitrogens having 2Px, 2Py,...
by jadam_1E
Wed May 30, 2018 11:13 am
Forum: Determining Molecular Shape (VSEPR)
Topic: How to know what position lone pair electrons will be at?
Replies: 1
Views: 53

How to know what position lone pair electrons will be at?

Specifically, I'm a bit confused about why a molecule with the VSEPR Formula AX3E2 would be T-Shaped rather than Trigonal Planar. I'm confused because my understanding was that lone pairs in a molecule tend to be as far apart as possible, and so the two lone pairs would be on opposite sides of the a...
by jadam_1E
Wed May 23, 2018 9:58 am
Forum: Formal Charge and Oxidation Numbers
Topic: Prioritizing Formal Charge
Replies: 2
Views: 180

Prioritizing Formal Charge

Is it best to minimize the formal charge of the center atom or one of the atoms attached to the center atom in order to write the Lewis structure of the overall lowest energy species?
by jadam_1E
Wed May 23, 2018 9:52 am
Forum: Octet Exceptions
Topic: Maximum number of electrons in expanded octet
Replies: 1
Views: 147

Maximum number of electrons in expanded octet

Hi all,
For an expanded octet, is there a limit to the number of valence electrons in the valence shells? Thanks.
by jadam_1E
Tue May 22, 2018 8:32 pm
Forum: Ionic & Covalent Bonds
Topic: Lewis Structures for Covalent Bonds
Replies: 1
Views: 81

Lewis Structures for Covalent Bonds

When drawing the lewis structure for (NH4)2CO3, the structure is written as 3 bracketed ions whereas the lewis structures for CH3COOH and (NH2)2CO are written without brackets, why is this?
by jadam_1E
Mon May 21, 2018 11:15 pm
Forum: Lewis Structures
Topic: Question about Resonance Structures
Replies: 1
Views: 69

Question about Resonance Structures

I understand that resonance structures are lewis structures that are all correct for a molecule, why is it important to know all correct resonance structures?
by jadam_1E
Sun Apr 15, 2018 10:46 pm
Forum: Properties of Light
Topic: What does it mean for all lines in a series to have the same lower energy level?
Replies: 3
Views: 87

What does it mean for all lines in a series to have the same lower energy level?

I understand that for all lines in say the Lyman series, all the lines created have the same lower energy level in common. Does this mean that if the given lower energy level that all the spectrum lines of a series have in common lower energy level n=2 and possible higher energy level of n=4,5,6.. t...
by jadam_1E
Sun Apr 15, 2018 10:09 pm
Forum: Properties of Light
Topic: The Electromagnetic spectrum
Replies: 5
Views: 107

Re: The Electromagnetic spectrum

I don't think that memorization, in terms of the exact range of wavelength for every type of electromagnetic radiation, will be needed. However, It will be good to know things like: red visible light has a longer wavelength than blue and violet visible light, ultraviolet light, x rays and gamma rays...
by jadam_1E
Sun Apr 15, 2018 9:20 pm
Forum: *Black Body Radiation
Topic: Example 1.3 in the textbook
Replies: 3
Views: 298

Re: Example 1.3 in the textbook

I think there will be some concept based questions on stefan boltzmann law, at the very least. For the second part of your question, T^4 because it was found that the intensity is not simply directly proportional to T, but it is proportional to T^4 (the temperature to the 4th power). The unit used f...
by jadam_1E
Sun Apr 15, 2018 8:53 pm
Forum: Photoelectric Effect
Topic: Kinetic Energy [ENDORSED]
Replies: 2
Views: 109

Re: Kinetic Energy [ENDORSED]

Is the concept of kinetic energy is the excess energy after a light hits a metal surface and the energy required to eject electron(s) using the light (photons) is more than needed? The kinetic energy of the ejected electron is equal to the energy of the photon - the threshold energy (also known as t...
by jadam_1E
Sun Apr 15, 2018 8:45 pm
Forum: Properties of Light
Topic: Bright Lines and the Atomic Spectra
Replies: 2
Views: 69

Bright Lines and the Atomic Spectra

In the textbook, it is stated that "the brightest line (at 656nm) is red" when light is emitted by excited hydrogen atoms and passed through a prism. Does this mean that other light is emitted but red is the brightest because when the excited hydrogen atoms give off em radiation, 656nm em ...
by jadam_1E
Tue Apr 10, 2018 10:14 pm
Forum: Molarity, Solutions, Dilutions
Topic: Fundamentals G21
Replies: 1
Views: 103

Re: Fundamentals G21

Because the objective of this question is to find the concentration of potassium ions, we need to find how many moles of potassium are in the solution. For every mole of K2S there will be 2 moles of K, so you can multiply the number of moles K2S by 2 to find the number of moles of K in the solution ...
by jadam_1E
Sun Apr 08, 2018 11:01 pm
Forum: Molarity, Solutions, Dilutions
Topic: G.23 from HW [ENDORSED]
Replies: 4
Views: 251

Re: G.23 from HW [ENDORSED]

For this problem, I approached it by thinking that for NaCl, the proportion of Cl ions to NaCl formula units is 1:1, and the proportion of Cl atoms to KCl formula units is also 1:1. Therefore, the concentration of Cl ions in the solution will be the same as the concentration calculated by converting...

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