CHEMISTRY COMMUNITY

madisonhanson1b

Oxidation number is how many electrons an atom will lose during bonding and the coordination number refers to the number of regions of electron density surrounding the central atom in a compound.

madisonhanson1b

The presence of lone pairs will cause all the bond angles in the atom to be slightly smaller than their original size, however we are not responsible for knowing how much the repulsion will affect this. We only need to know that the lone pairs make the bonds smaller.

madisonhanson1b

If two dipole moments point in exact opposite directions they will cancel each other out and cause the molecule to be non polar, but if the dipole moments do not exactly cancel each other out then there will be a resulting polarity of the molecule.

madisonhanson1b

Pi bonds involve the overlapping of atomic orbitals in covalent bonds. Pi bonds are only used when there is more than one bond (double or triple bond)

madisonhanson1b

As I understand we only have to understand how coordination complexes work, not name them, correct?

madisonhanson1b

I know elements can break the octet rule, but up to how many extra electrons can they have?

madisonhanson1b

The elements in the 7th column never form double bonds, as a general rule

madisonhanson1b

Anytime a compound or molecule has an odd number of electrons its going to be a radical

madisonhanson1b

I thought you put the molecule with the lowest electronegativity in the center, are ionization energy and electronegativity the same thing?

madisonhanson1b

This is correct!

madisonhanson1b

A polar covalent bond is when electrons are shared between the atoms (as opposed to transferred which would be ionic) but the sharing is not completely equal. That means that the shared electrons will be pulled closer to one atom than the other, but they are still shared

madisonhanson1b

Can someone explain why Xe can have so many bonds/ lone pair electrons in this lewis structure?

madisonhanson1b

Hello Does anyone know how heavily sig figs are weighted on the midterm? As in, if we dont properly use sig figs would an entire answer be wrong or would just a couple points be taken off for lack of sig figs? Also, if a problem uses an answer you had to obtain earlier in the problem do you use the ...

madisonhanson1b

When given two energy levels (n1,n2) or a beginning and ending energy state you can use the E=R(1/n-1/n). The other formula, E=-R(h/n^2) is used to find the energy of an electron in the nth state of a hydrogen atom specifically

madisonhanson1b

Also, at one of the review sessions they said that most of the time you will just need to use (=) not (>=) for the equations we are currently doing

madisonhanson1b

Chromium also has the same except rule as copper!

madisonhanson1b

The ionization energies and electron affinities of carbon, nitrogen, oxygen, and fluorine do not match with the trends perfectly. Also, chromium and copper have unique electron configuration rules.

madisonhanson1b

I am pretty sure covalent radius is not a trend on the periodic table.

madisonhanson1b

However, I think you have to be careful because "intensity" of light (or bright vs faint light) does not affect anything during electron emission, whereas wavelength and frequency will affect this.

madisonhanson1b

You can use two equations to reach a final answer. The first equation is deltaE=hv(frequency). You can then use the equation v(frequency)=c/wavelength as a substitute for v(frequency). This will give you the combined equation of deltaE=hc/wavelength. H and C are both constants and the wavelength is ...

madisonhanson1b

Hello! I am planning on going to many of the review/workshop sessions coming up, but I was wondering if it would be possible to have the review sessions either BruinCast or have the review material posted on the website somewhere. I know I am probably not the only one who would like to attend all th...

madisonhanson1b

I dont know the average score, but a lot of kids in my discussion were not able to finish all the problems, if that makes you feel better.

madisonhanson1b

Constructive diffraction is when the peaks and troughs of the waves line up, the other diffraction is when the peaks and troughs of the waves do not line up and then essentially cancel each other out (in really basic terms)

madisonhanson1b

He said the approximate cutoff is 10^-18 for whether or not you would be able to observe the wavelike properties.

madisonhanson1b

I believe the homework for week 2 is from outline 2, but after doing some research I am not positive because the schedule is not explicitly mentioned.

madisonhanson1b

In this case, if the decimal was .985243649 but you only wanted one significant figure would you round up to 1? Or would you stay at .9

madisonhanson1b

Most commonly I think we have been using the equation in the form wavelength= c (3.0 x 10^8)/ frequency to solve for the wavelength. I feel like that is the most common form of the equation that we have seen.

madisonhanson1b

I always find it helpful to fully erase and rewrite the coefficients to keep the problem organized. Also remember that you can use fractions in certain spots to make the math a bit easier then you can multiply everything by the denominator of the fraction.

madisonhanson1b

Will we be able to use a calculator on Test 1 and all future tests?

madisonhanson1b

Hey Brynne!
You will not need sig figs for test 1 but probably will need them in the future, Lavelle just said this in lecture today.

Madison

CHEMISTRY COMMUNITY

Search found 30 matches

Re: coordination number vs. oxidation number [ENDORSED]

Re: Bond angles [ENDORSED]

Re: Question 4.29 [ENDORSED]

Re: Question 4.45

Re: Final

Re: Octet rule

Re: double and triple bonds?

Re: 3.55

Re: 3.33 c). Ionization energy question.

Re: Ionic compound

Re: Polar covalent bonds

Lewis Structure of XeO2F2

Midterm Significant Figures [ENDORSED]

Re: E=R(1/n-1/n)?

Re: equation

Re: Order of Orbitals

Re: Ionization exceptions [ENDORSED]

Re: Periodic Trends

Re: Energy vs Intensity

Re: Test 2 Q.4

Review Sessions [ENDORSED]

Re: Test Number 1

Re: Diffraction meaning

Re: Measurable Wavelike properties

Re: Homework for Week 2

Re: Sig fig simple question [ENDORSED]

Re: Speed of light wavelength equation [ENDORSED]

Re: H.5: Balancing Equations

Calculator On Test [ENDORSED]

Re: Sig Figs [ENDORSED]