CHEMISTRY COMMUNITY

Peichung Chou 1A

Generally molecules that include metalloids are amphoteric such as silicon and boron.

Peichung Chou 1A

I don’t believe you have to remember common ligand names but it would be helpful to review them anyway.

Peichung Chou 1A

The easiest way to determine charge would probably be to just draw the Lewis structure and find the formal charge.

Peichung Chou 1A

The homework for that section includes both, so I would practice both.

Peichung Chou 1A

The lone pair of SO2 does affect the bond lengths of the molecule. When there is a lone pair, the electrons of that pair repel the electrons in the atomics in the molecule, and thus push the atoms further than they would be without a lone pair present. Thus, the bond lengths of SO2 are slightly long...

Peichung Chou 1A

Each set of lone pairs would be considered its own region of electron density.

Peichung Chou 1A

I don't believe you'll have to memorize ligand names, but I would look over them anyway.

Peichung Chou 1A

No, you should be fine just being able to draw the basic lewis structures.

Peichung Chou 1A

No, resonance structures do not effect the determination of lewis structure and vsepr models of molecules.

Peichung Chou 1A

Yes, the molecular shape for an AX2E and AX2E2 molecule are both bent. However, the electron geometry would be different for both.

Peichung Chou 1A

When two electrons overlap, a sigma bond is created. More sigma bonds generally aren't created as in order to form more bonds, the only possibility is to have electrons side-by-side, which indicates a pi bond.

Peichung Chou 1A

A molecule with AX3 atoms and two pairs of free electrons are known as a T-shaped molecule.

Peichung Chou 1A

I'm not sure if I'm interpreting your question properly, but I believe NF3 should be able to create a hydrogen bond with hydrogen, because the fluorine molecules are highly electronegative.

Peichung Chou 1A

Single bonds are the weakest because the valence electrons with which the bonds are made are at the greatest distance, and so there is less attraction between the nucleus and the electrons. As distance increases, the force of attraction between any two objects decreases.

Peichung Chou 1A

You should be able to determine if something is a resonant structure from formal charge tests, as a resonant structure will contain one or more bonds of multiple bond order. However, otherwise there is no trick to determine whether something is a resonant structure.

Peichung Chou 1A

All elements that are greater than the atomic number of 20 may have an expanded octet, although the most common exceptions are in the 3p orbital.

Peichung Chou 1A

Electron affinity increases across a period and decreases down a group because of the number of valence electrons, as well as valence electron shielding.

Peichung Chou 1A

The actual formula for bond order we don't need to know yet. Just know the basic ones like triple bonds correspond to a bond order of 3, and a double bond to a bond order of 2, etc...

Peichung Chou 1A

Formal charge should be referenced to see how many bonds should be attached.

Peichung Chou 1A

The order of electron configurations is written from lowest energy to highest energy. When occupied, the 3d block is of less energy than the 4s, and so is written before the 4s block. When bonding, the 4s electrons are removed before the 3d.

Peichung Chou 1A

Degeneracy indicates that the orbital has the same energy. For instance, 3px and 3py are degenerate orbitals because they have the same amount of energy.

Peichung Chou 1A

Whenever you do these types of calculations, remember to always use proper parentheses placement. If parentheses are inserted correctly, it will throw off your calculations.

Peichung Chou 1A

The quantum number m can be seen as in 3 axes, x, y and z. These axes correspond to the m numbers of -1, 0 ,1 used in the example. However, because the order can be flipped as 1,0,-1, professor Lavelle stated that the answer could be x or z.

Peichung Chou 1A

The oil-drops were negatively charged through ionization with an x-ray. Thus, they were intentionally charged by the experimenters Millikan and Fletcher.

Peichung Chou 1A

Spin is the total angular momentum of an object, described in discrete values based on Planck's constant. Basically, spin is the inert angular momentum of the electron in quantized levels.

Peichung Chou 1A

I think the easiest way to do this would be to just remember the SI units that are used in each derived unit. For example, remember that Joules are kg m^2 / s^2

Peichung Chou 1A

Considering the equation c = lambda * nu, the color of light is reliant on both wavelength and frequency. Wavelength is the standard to describe what color it is though.

Peichung Chou 1A

Significant figures are not affected by constants that are input.

Peichung Chou 1A

The way I think about it is for each molecule you're testing in candidacy for limiting reagent, pretend the other is unlimited in amount. Calculate the molar ratio for the limited molecule with the product and see how much product you get. Do the same with the other molecule, then compare which mole...

Peichung Chou 1A

According to the file professor Lavelle posted on his website, you round up to the next number only if there is a number following the 5 (e.g. 4.56 to 2 sig figs is 4.6). Otherwise you round to the nearest even number.

CHEMISTRY COMMUNITY

Search found 30 matches

Re: Examples

Re: Ligand Names

Re: Naming the Shape

Re: With Respect to the Final

Re: 7th Edition 2D.7

Re: Lone pairs when determining hybridization

Re: Common Ligand Names

Re: Drawing Structures on Test

Re: VSEPR Models and Resonance Structures

Re: Bent - Lone Pairs

Re: sigma bonds

Re: AX3E2 Shape

Re: Electronegativity in Molecules with N,O,F

Re: bond lengths and strengths

Re: Finding all Resonance Structures

Re: Octet

Re: Electron Affinity

Re: bond order

Re: Garlic Bread 12a

Re: D-block Question

Re: Degeneracy

Re: Power calculations

Re: Lecture Question on Orbitals

Re: Oil Drop Experiment

Re: 4th quantum number

Re: SI and equation units

Re: color of light

Re: Should Significant Figures be affected by constants?

Re: How to determine the limiting reactant???? [ENDORSED]

Re: Rounding Off of 5