CHEMISTRY COMMUNITY

Yiwen Chen-3G

Hi, just want to ask that will this be on the final? Thank you!

Yiwen Chen-3G

Hi, do we need to know the concept of Ka for the final?

Yiwen Chen-3G

I think we need to memorize them

Yiwen Chen-3G

Are we required to memorize all the ligand names on 7th edition Table 9C.1? (Common Ligands)

Yiwen Chen-3G

When do we use di, tri, tetra and when do we use bis, tris?

Yiwen Chen-3G

A ligand is a type of Lewis base since the definition of a Lewis base is an electron donor. But the definition of ligand is an ion or molecule bound to the central atom to form a coordination complex. So they are not interchangeable.

Yiwen Chen-3G

72&90

Yiwen Chen-3G

Accept electrons

Yiwen Chen-3G

You can also tell by whether it has H+ or OH-. However, it's actually the same thing, since H+ attracts electrons and OH- repels electrons. You can interpret repelling electrons as "giving" electrons out; attracting electrons as receiving electrons.

Yiwen Chen-3G

You can think of it this way: the higher boiling point, the harder it is to separate between molecules. Therefore, a stronger intermolecular force results in a higher boiling point.

Yiwen Chen-3G

Because electrons are all negatively charged, they repel each other. Since the lone pairs are closer to the nucleus, their domain is smaller (more tightly bounded to the nucleus), which will result in a greater repulsion. For electrons in the bonds, there is a larger domain for them since they are f...

Yiwen Chen-3G

O2 is actually nonpolar. Since there's no dipole.

Yiwen Chen-3G

I think electronegativity is the ability of drawing the shared electrons towards itself. Polarizability is the ability to form instant dipoles. Electonegativity increase across a row and decrease down a group. This is because, in the same row, the right atoms need more electrons to achieve the most ...

Yiwen Chen-3G

Hi,
does anyone know the grading scale of this class?
Is it 90 an A or 93?

Yiwen Chen-3G

I got 130 cuz there are 2 resonance structures.

Yiwen Chen-3G

I think you can think the problem in this way, with the forming of chemical bonds, more electrons are fixed instead of moving freely. So there will be a decrease in energy for a bound atom compared to the separate ones.

Yiwen Chen-3G

Generally the shorter the bond length, the stronger the bond will be. I think it might be because that if the bond is shorter, the two atoms should be closer. Therefore, more energy is required to break this kind of bonds.

Yiwen Chen-3G

Hi,
Do you guys know which sections will be covered in Midterm 1?

Yiwen Chen-3G

I think it means the energy required to take one electron away from the atom.

Yiwen Chen-3G

I think you can try to think it this way: the electron on the outer shells are generally less stable than those on the more inside shells, because the inner electrons are closer to the protons so that there is stronger electromagnetic attraction. Removing a second electron is to remove one inner ele...

Yiwen Chen-3G

I think we only need to known what it is used for. We don't need to know the exact calculations.

Yiwen Chen-3G

Thank you for your reply! That helps a lot!

Yiwen Chen-3G

Hi, do we have to know the equation and use it for calculation?

Yiwen Chen-3G

Could someone explain why symmetric orbitals don't have a nodal plane?

Yiwen Chen-3G

This is just the formula of kinetic energy in physics. In this case it calculates the kinetic energy of the ejected electron.

Yiwen Chen-3G

I heard of a rule about keeping different numbers of sig figs depends on doing multiplication or addition. Does someone know about this rule and maybe help me clarify it? Thank you!

Yiwen Chen-3G

Yes I have the same problem. Don't know if the naming part would appear on Test 1.

Yiwen Chen-3G

I believe you should round it to 3 sig figs since the numbers given in the problem are all 3 sig figs.

Yiwen Chen-3G

Yes I think I have the same problem. Thanks for answers above!

Yiwen Chen-3G

Thank you so much for your useful advice! I think I would try my best to master this course!

CHEMISTRY COMMUNITY

Search found 30 matches

Re: PKa and Pkb vs Ka and Kb

Ka&Final

Re: Naming Coordination Compounds

Common Ligand names Table

Usage of prefix

Re: Ligands and Lewis bases

Re: Naming

Re: Determine Lewis Acid

Re: Difference Between Acids and Bases

Re: Shape and Boiling Point

Re: Repulsion Strength

Re: Linear Shape of O2

Re: Electronegativity relationship with Polarizability

Grading

Re: MIDTERM Bond Length Question

Re: bound atoms vs separate atoms

Re: Bond length Correlation

Midterm

Re: Ionization energies

Re: Removing 2nd Electron

Re: Application of Equation on test

Re: Number of Orbitals

Using the equation [ENDORSED]

Nodal Plane and Symmetic

Re: Photoelectric Effect

Re: All students read this sig fig post [ENDORSED]

Re: Compound Names

Re: M11 Sig Figs

Re: formula units [ENDORSED]

Re: Advice from a Medical Student [ENDORSED]