CHEMISTRY COMMUNITY

Jared Pagal 1J

Remember, all CATions are PAWsitive! XD

Jared Pagal 1J

This problem is a combustion problem so we know that one of the reactants is O2, and given the products of CO2, H2O, and N, we know that the oxygen in the products comes from O2. This would mean that C,H, and N make up nicotine. Also I believe during that midterm he told us it was CHN

Jared Pagal 1J

yazminedesan1F wrote:How do you find the oxidation number of a metal?

Metal ion + (number of ligands bound * charge of ligand) = overall charge of coordination compound. Hope this helps!

Jared Pagal 1J

The first bond in a double bond is a sigma and the second is a pi, which one is which is arbitrary. In a triple bond, there would be one sigma bond and two pi bonds.

Jared Pagal 1J

I think that for the final, we should be familiar with coloumb's law but I feel that a question solely on coulomb's law would be unlikely.

Jared Pagal 1J

In order to find the concentrations of Na ions in the final solutions, you must first find the concentration of the Na ions in the first solution. Using the Molecular formula of (Na2CO3), you know that the 0.0377 concentration of sodium bicarbonate must be doubled since there are two Na for every on...

Jared Pagal 1J

I don't think we will be required to memorize ligands, so just know that a ligand is any atom or molecule that binds to another atoms.

Jared Pagal 1J

in drawing a lewis structure, typically the least electronegative atom is the central atom

Jared Pagal 1J

Does a lone pair count as one region of electron density? or do you count both electrons each as a region of density?

Jared Pagal 1J

the size of the electron cloud is determined by the energy of the atom's electrons, I believe. A few factors influence polarizability. The greater the amount of electrons, the less control the nuclear charge has on charge distribution, thus the increased polarizability of the atom. Additionally, th...

Jared Pagal 1J

Amir Akhavan 1E wrote:I think it is important in naming the molecule and knowing its geometric shape. It could also be a question he may ask on the exam.

How would this be tested on the exam? Would it apply to the naming of the shape or the compound itself?

Jared Pagal 1J

Miya Lopez 1L wrote:But if you have more lone pairs, they would push the other bonds/molecules even further away from them correct? Thank you:)

Yes, additionally, I believe that the force that a lone pair exerts on bonds would be greater than the force a bond has on another bond.

Jared Pagal 1J

There is a general rule when constructing lewis structures: any left over electrons usually are put on the central atom. Additionally, notice that Iodine has an expanded octet and can therefore accept those lone pairs.

Jared Pagal 1J

I believe that these two structures are essentially the same things because, as you said, they have equal numbers of bonds and electrons. Also, remember that resonance structures show the possible combinations of where electrons may be in the electron “cloud” so in actuality the electrons move aroun...

Jared Pagal 1J

does an atom have to give up or take an electron in order for it to be a radical? or if the valence shell has an odd number of electrons is it already considered a radical?

Jared Pagal 1J

Do dipole-induced dipole interactions still occur in aqueous solution? For the example given in lecture on friday, Prof. Lavelle said that HCl would induce a dipole force in N2. Would this still be the case if HCl disassociated into H+ and Cl- in solution?

Jared Pagal 1J

When constructing a resonance structure, is it more common to add double bonds between atoms or lone pairs to the central atom to balance out the number of valence electrons?

Jared Pagal 1J

I don't think that they will always have more than 8 electrons because it depends on the total count of the valence electrons in the molecule. For example, when sodium and chlorine form NaCl, Cl does not have more than 8 electrons in its valence shell. The expanded octet rule does not mean that they...

Jared Pagal 1J

In context of this question, the monoatomic ion in part a would be both magnesium and arsenic. What the question refers to what it says "expected charges" is to balance the molecular formula so that the charges balance out between each monoatomic ion.

Jared Pagal 1J

Basically, orbitals hybridize because hybridization allows for the molecule to be in its lowest possible energy state (or most stable state). The shape of hybridized orbitals depends on how many electrons are present how much energy they have

Jared Pagal 1J

So in lecture on Wednesday, Prof. Lavelle used Scandium as an example to write out the electron configuration. His answer was Sc: [Ar]3d^1 4s^2. However, when I use the Aufbau principle, I get Sc: [Ar]4s^2 3d^1

Is the 3d orbital always going to be a higher energy level than 4s?

Jared Pagal 1J

Yes, in order for a photon to be emitted, the energy of the incoming photon must be equal to or greater than the threshold energy (the minimum energy it takes to eject one electron). Any "excess" energy is considered the kinetic energy of the ejected electron.

Jared Pagal 1J

Would it be wrong to say that a photon is the smallest quantum of light, like how one water molecule is the smallest quantum of water?

Jared Pagal 1J

The second value in the table is given as Energy equals 3.3x10^-19 J. I divided by Planck's constant using the equation E=hv and the result was 4.980x10^14. Is it unusual to have a wavelength that long?

CHEMISTRY COMMUNITY

Search found 24 matches

Re: Post All Chemistry Jokes Here

Re: Midterm Q3

Re: Oxidation Number

Re: VESPER Theory and Bond types

Re: Coulomb's law

Re: Test 1, question 1 part B

Re: ligands?

Re: lewis structure

Re: How to figure out hybridization

Re: Polarizability

Re: Significance of Coordination Number?

Re: Molecular Shape

Re: 3.61

Re: Different ways to write the lewis structure?

Re: radicals [ENDORSED]

Dipole-Induced Dipole Interactions in Solution [ENDORSED]

Bonds or Lone Pairs more important?

Re: Expanded Octet

Re: monatomic ion

Re: Hybrid orbitals

Electron Configuration of Scandium

Re: Photoelectric Effect

Re: still don't uderrsatnd what a photon is [ENDORSED]

Re: 1.9