Search found 30 matches

by Yiwen Chen-3G
Thu Dec 06, 2018 8:50 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: PKa and Pkb vs Ka and Kb
Replies: 4
Views: 373

Re: PKa and Pkb vs Ka and Kb

Hi, just want to ask that will this be on the final? Thank you!
by Yiwen Chen-3G
Thu Dec 06, 2018 8:48 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Ka&Final
Replies: 1
Views: 70

Ka&Final

Hi, do we need to know the concept of Ka for the final?
by Yiwen Chen-3G
Thu Dec 06, 2018 9:30 am
Forum: Naming
Topic: Naming Coordination Compounds
Replies: 4
Views: 83

Re: Naming Coordination Compounds

I think we need to memorize them
by Yiwen Chen-3G
Wed Dec 05, 2018 7:23 pm
Forum: Naming
Topic: Common Ligand names Table
Replies: 1
Views: 75

Common Ligand names Table

Are we required to memorize all the ligand names on 7th edition Table 9C.1? (Common Ligands)
by Yiwen Chen-3G
Wed Dec 05, 2018 7:05 pm
Forum: Naming
Topic: Usage of prefix
Replies: 2
Views: 62

Usage of prefix

When do we use di, tri, tetra and when do we use bis, tris?
by Yiwen Chen-3G
Mon Dec 03, 2018 9:22 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands and Lewis bases
Replies: 3
Views: 70

Re: Ligands and Lewis bases

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.
by Yiwen Chen-3G
Wed Nov 28, 2018 12:10 am
Forum: Naming
Topic: Naming
Replies: 5
Views: 269

Re: Naming

72&90
by Yiwen Chen-3G
Wed Nov 28, 2018 12:07 am
Forum: Lewis Acids & Bases
Topic: Determine Lewis Acid
Replies: 13
Views: 534

Re: Determine Lewis Acid

Accept electrons
by Yiwen Chen-3G
Wed Nov 28, 2018 12:07 am
Forum: Lewis Acids & Bases
Topic: Difference Between Acids and Bases
Replies: 4
Views: 100

Re: Difference Between Acids and Bases

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.
by Yiwen Chen-3G
Fri Nov 16, 2018 10:31 am
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Shape and Boiling Point
Replies: 12
Views: 484

Re: Shape and Boiling Point

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.
by Yiwen Chen-3G
Fri Nov 16, 2018 10:25 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Repulsion Strength
Replies: 5
Views: 99

Re: Repulsion Strength

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...
by Yiwen Chen-3G
Fri Nov 16, 2018 10:15 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Linear Shape of O2
Replies: 4
Views: 77

Re: Linear Shape of O2

O2 is actually nonpolar. Since there's no dipole.
by Yiwen Chen-3G
Fri Nov 09, 2018 11:03 am
Forum: Electronegativity
Topic: Electronegativity relationship with Polarizability
Replies: 3
Views: 122

Re: Electronegativity relationship with Polarizability

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 ...
by Yiwen Chen-3G
Fri Nov 09, 2018 10:49 am
Forum: Bond Lengths & Energies
Topic: Grading
Replies: 3
Views: 111

Grading

Hi,
does anyone know the grading scale of this class?
Is it 90 an A or 93?
by Yiwen Chen-3G
Fri Nov 09, 2018 10:48 am
Forum: Bond Lengths & Energies
Topic: MIDTERM Bond Length Question
Replies: 15
Views: 276

Re: MIDTERM Bond Length Question

I got 130 cuz there are 2 resonance structures.
by Yiwen Chen-3G
Wed Oct 31, 2018 1:11 pm
Forum: Coordinate Covalent Bonds
Topic: bound atoms vs separate atoms
Replies: 5
Views: 237

Re: bound atoms vs separate atoms

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.
by Yiwen Chen-3G
Wed Oct 31, 2018 1:07 pm
Forum: Bond Lengths & Energies
Topic: Bond length Correlation
Replies: 2
Views: 136

Re: Bond length Correlation

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.
by Yiwen Chen-3G
Mon Oct 29, 2018 10:22 am
Forum: Ionic & Covalent Bonds
Topic: Midterm
Replies: 2
Views: 59

Midterm

Hi,
Do you guys know which sections will be covered in Midterm 1?
by Yiwen Chen-3G
Fri Oct 26, 2018 3:50 pm
Forum: Trends in The Periodic Table
Topic: Ionization energies
Replies: 9
Views: 182

Re: Ionization energies

I think it means the energy required to take one electron away from the atom.
by Yiwen Chen-3G
Fri Oct 26, 2018 3:48 pm
Forum: Trends in The Periodic Table
Topic: Removing 2nd Electron
Replies: 9
Views: 161

Re: Removing 2nd Electron

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...
by Yiwen Chen-3G
Fri Oct 26, 2018 3:45 pm
Forum: *Shrodinger Equation
Topic: Application of Equation on test
Replies: 5
Views: 272

Re: Application of Equation on test

I think we only need to known what it is used for. We don't need to know the exact calculations.
by Yiwen Chen-3G
Wed Oct 17, 2018 11:31 pm
Forum: Quantum Numbers and The H-Atom
Topic: Number of Orbitals
Replies: 3
Views: 133

Re: Number of Orbitals

Thank you for your reply! That helps a lot!
by Yiwen Chen-3G
Wed Oct 17, 2018 11:26 pm
Forum: *Shrodinger Equation
Topic: Using the equation [ENDORSED]
Replies: 1
Views: 55

Using the equation [ENDORSED]

Hi, do we have to know the equation and use it for calculation?
by Yiwen Chen-3G
Wed Oct 17, 2018 11:09 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodal Plane and Symmetic
Replies: 1
Views: 44

Nodal Plane and Symmetic

Could someone explain why symmetric orbitals don't have a nodal plane?
by Yiwen Chen-3G
Tue Oct 09, 2018 8:30 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 6
Views: 71

Re: Photoelectric Effect

This is just the formula of kinetic energy in physics. In this case it calculates the kinetic energy of the ejected electron.
by Yiwen Chen-3G
Tue Oct 09, 2018 8:27 pm
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 91
Views: 8926

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

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!
by Yiwen Chen-3G
Tue Oct 09, 2018 8:24 pm
Forum: Empirical & Molecular Formulas
Topic: Compound Names
Replies: 9
Views: 303

Re: Compound Names

Yes I have the same problem. Don't know if the naming part would appear on Test 1.
by Yiwen Chen-3G
Thu Oct 04, 2018 9:07 am
Forum: Significant Figures
Topic: M11 Sig Figs
Replies: 4
Views: 102

Re: M11 Sig Figs

I believe you should round it to 3 sig figs since the numbers given in the problem are all 3 sig figs.
by Yiwen Chen-3G
Tue Oct 02, 2018 10:40 pm
Forum: SI Units, Unit Conversions
Topic: formula units [ENDORSED]
Replies: 68
Views: 21921

Re: formula units [ENDORSED]

Yes I think I have the same problem. Thanks for answers above!
by Yiwen Chen-3G
Tue Oct 02, 2018 10:32 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 96
Views: 48109

Re: Advice from a Medical Student [ENDORSED]

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

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