Search found 61 matches

by Yiyang Jen Wang 4G
Mon Jan 20, 2020 7:41 pm
Forum: Student Social/Study Group
Topic: Curve?
Replies: 12
Views: 526

Re: Curve?

I think it depends on the class average at the end of the quarter.
by Yiyang Jen Wang 4G
Mon Jan 20, 2020 7:34 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Adding Inert Gas
Replies: 9
Views: 28

Re: Adding Inert Gas

If the pressure of the reaction increased by adding inert gas(noble gas) there will be no effect on P&R concentration and no effect on the reaction.
by Yiyang Jen Wang 4G
Mon Jan 20, 2020 7:22 pm
Forum: Student Social/Study Group
Topic: Test 1
Replies: 9
Views: 51

Re: Test 1

There isn’t any past exam questions for practicing unfortunately but the homework problems should definitely help.
by Yiyang Jen Wang 4G
Mon Jan 20, 2020 7:15 pm
Forum: Ideal Gases
Topic: homework #3
Replies: 16
Views: 83

Re: homework #3

I think either “acid and base equilibria” or the topic that we are going to cover in Wednesday’s lecture should be fine.
by Yiyang Jen Wang 4G
Mon Jan 20, 2020 7:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pH Examples
Replies: 3
Views: 26

Re: pH Examples

I would recommend to at least get familiar with most of them.
by Yiyang Jen Wang 4G
Mon Jan 20, 2020 7:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE table and X
Replies: 6
Views: 19

Re: ICE table and X

You can approximate when K is less than 10^-3.
by Yiyang Jen Wang 4G
Mon Jan 20, 2020 7:06 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Converting K to Kc
Replies: 4
Views: 29

Re: Converting K to Kc

K can be Kc (for concentration) or Kp (dealing with gas given the partial pressure). PV=nRT can be used to convert between Kc and Kp.
by Yiyang Jen Wang 4G
Mon Jan 20, 2020 7:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pKa of conjugate acid relating to strength of base
Replies: 2
Views: 13

Re: pKa of conjugate acid relating to strength of base

We need pka to solve for pkb, and then we can rank the bases in order of strength. The larger the pka value : the smaller the pkb, the weaker the acid, and the stronger the conjugate base. Therefore ethylamine is the strongest base.
by Yiyang Jen Wang 4G
Mon Jan 20, 2020 6:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Van’t Hoff Equation
Replies: 4
Views: 23

Re: Van’t Hoff Equation

I do not think we went over this concept in class so probably no need to worry about it.
by Yiyang Jen Wang 4G
Mon Jan 20, 2020 6:53 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE tables
Replies: 5
Views: 12

Re: ICE tables

It is normally used to calculate the equilibrium constant K of a reaction. Or when K is given, it can be used to calculate one or more of the concentrations in the table that are unknown.
by Yiyang Jen Wang 4G
Sun Dec 08, 2019 12:17 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration
Replies: 4
Views: 49

Re: Electron Configuration

You should put 3d before 4s since when 3d is filled it has lower energy than 4s.
by Yiyang Jen Wang 4G
Sat Dec 07, 2019 11:31 pm
Forum: Student Social/Study Group
Topic: Equilibrium
Replies: 3
Views: 27

Equilibrium

Last minute questions....How much do we need to know about the equilibrium for the upcoming final? :( I am so stressed out...
by Yiyang Jen Wang 4G
Sat Dec 07, 2019 11:27 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH sig figs
Replies: 11
Views: 69

Re: pH sig figs

Yes for PH sic figs count after the decimal
by Yiyang Jen Wang 4G
Sat Dec 07, 2019 11:16 pm
Forum: Student Social/Study Group
Topic: Studying for Final
Replies: 4
Views: 49

Re: Studying for Final

Anyone know where to find any past exam questions for practicing? Really need to work on some actual problems!
by Yiyang Jen Wang 4G
Sat Dec 07, 2019 2:00 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Ka Kb on the Final
Replies: 2
Views: 35

Ka Kb on the Final

Just want to make sure... How much do we need to know about Ka, Kb, pKa and pKb for the upcoming final? Do we need to know how to calculate them? My TA mentioned in the section that we do not need to worry too much about them for this class since they will appear again in 14B...but they are on the s...
by Yiyang Jen Wang 4G
Sun Dec 01, 2019 10:23 pm
Forum: Lewis Acids & Bases
Topic: Weak vs. Strong
Replies: 8
Views: 39

Re: Weak vs. Strong

Weak acids will have a higher pH value(lower concentration of hydrogen ions) than strong acids At the same concentration.
by Yiyang Jen Wang 4G
Sun Dec 01, 2019 10:16 pm
Forum: Lewis Acids & Bases
Topic: Donating Proton vs Accepting Electron
Replies: 4
Views: 28

Re: Donating Proton vs Accepting Electron

They both talk about the same thing just with two different concepts, one based one proton and on based on electron. As an acid donates a proton, it can be also viewed as accepting an electron.
by Yiyang Jen Wang 4G
Sun Dec 01, 2019 10:01 pm
Forum: Lewis Acids & Bases
Topic: Relative acidity
Replies: 4
Views: 19

Re: Relative acidity

Strong acids are fully ionised but weak acids are only partly ionised in solution. At the same concentration, weak acids have a higher pH value(lower concentration of hydrogen ions) than strong acids.
by Yiyang Jen Wang 4G
Sun Dec 01, 2019 9:58 pm
Forum: Lewis Acids & Bases
Topic: Final
Replies: 4
Views: 19

Re: Final

I have the same question. I assume there will be more questions on week 6-10 materials but not sure.
by Yiyang Jen Wang 4G
Sun Nov 24, 2019 7:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent Shape
Replies: 29
Views: 185

Re: Bent Shape

One or two I believe
by Yiyang Jen Wang 4G
Sun Nov 24, 2019 7:13 pm
Forum: Hybridization
Topic: dsp3 vs sp3d
Replies: 4
Views: 33

Re: dsp3 vs sp3d

I think they are the same. Just depends on personal preferences.
by Yiyang Jen Wang 4G
Sun Nov 24, 2019 7:08 pm
Forum: Hybridization
Topic: stability in hybridization
Replies: 4
Views: 25

Re: stability in hybridization

The sp2 bond would actually be more stable~
by Yiyang Jen Wang 4G
Sun Nov 24, 2019 7:04 pm
Forum: Hybridization
Topic: Sigma and Pi bonds
Replies: 13
Views: 57

Re: Sigma and Pi bonds

I think you can just label the bonds with their names and draw them normally.
by Yiyang Jen Wang 4G
Sun Nov 24, 2019 6:51 pm
Forum: Hybridization
Topic: Lone pairs
Replies: 9
Views: 41

Re: Lone pairs

I think since they will affect the shape of the molecules, they will also contribute in hybridization.
by Yiyang Jen Wang 4G
Sun Nov 24, 2019 6:48 pm
Forum: Hybridization
Topic: d-orbitals
Replies: 7
Views: 38

Re: d-orbitals

Yes, they do. There are five d orbitals, referred to as dz2, dxy, dxz, dyz , and dx2-y2. The d orbitals are what give transition metals their special properties.
by Yiyang Jen Wang 4G
Sun Nov 17, 2019 11:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Resonance and VSEPR
Replies: 9
Views: 40

Re: Resonance and VSEPR

No. I don’t think resonance would have any effect on VESPR.
by Yiyang Jen Wang 4G
Sun Nov 17, 2019 11:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Repulsion Strength
Replies: 5
Views: 33

Re: Repulsion Strength

It depends on the distance between them. Since lone pairs are the closest to each other, they have the greatest repulsion strength.
by Yiyang Jen Wang 4G
Sun Nov 17, 2019 11:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Drawing molecules
Replies: 12
Views: 72

Re: Drawing molecules

I don not think that we will be ask to draw the 3D models but we should definitely know their shapes, names, and angles between the bonds in each structure.
by Yiyang Jen Wang 4G
Sun Nov 17, 2019 11:30 pm
Forum: Hybridization
Topic: Pi and Sigma Bonds
Replies: 17
Views: 322

Re: Pi and Sigma Bonds

One sigma bond for single, double, triple bond. One pi bond for double bond, and two pi bonds for triple bonds.
by Yiyang Jen Wang 4G
Sun Nov 17, 2019 11:26 pm
Forum: Hybridization
Topic: test 2
Replies: 8
Views: 61

Re: test 2

According to our TA, Hybridization will not be on test 2. But the structures, shape, angles, and pi vs sigma bonds....will be on there.
by Yiyang Jen Wang 4G
Mon Nov 11, 2019 8:40 am
Forum: Hybridization
Topic: Noble Configuration vs. Full
Replies: 7
Views: 46

Re: Noble Configuration vs. Full

I believe it should say in the question which one to use. If not specified, either way should be fine.
by Yiyang Jen Wang 4G
Mon Nov 11, 2019 8:34 am
Forum: Hybridization
Topic: Determining how many electron densities
Replies: 5
Views: 177

Re: Determining how many electron densities

Yes! Lone pairs do count toward the number of electron densities! The F atom should have four regions of electron density.
by Yiyang Jen Wang 4G
Mon Nov 11, 2019 8:28 am
Forum: Hybridization
Topic: dsp3 vs. sp3d
Replies: 3
Views: 215

Re: dsp3 vs. sp3d

Both are fine, but sp3d is preferred.

See the answer here: viewtopic.php?t=1256
by Yiyang Jen Wang 4G
Mon Nov 11, 2019 8:26 am
Forum: Hybridization
Topic: The D Orbital
Replies: 4
Views: 253

Re: The D Orbital

KatherineValdez_4B wrote:so when you reach a d-orbital does it go before or after the previous s-orbital?


I believe both dsp3 or sp3d are okay but sp3d is preferred?
Here is the answer:
viewtopic.php?t=1256
by Yiyang Jen Wang 4G
Mon Nov 11, 2019 8:10 am
Forum: Hybridization
Topic: Hybrid Orbitals
Replies: 6
Views: 289

Re: Hybrid Orbitals

Only the orbitals need to be included so the answer should be sp sp2 sp3...
by Yiyang Jen Wang 4G
Sun Nov 03, 2019 7:41 pm
Forum: Dipole Moments
Topic: Induced Dipole
Replies: 5
Views: 49

Re: Induced Dipole

In induced dipole, or London force, the dipole is created by the movement of electrons, causing a temporary dipole because one end is more negative than the other.
by Yiyang Jen Wang 4G
Sun Nov 03, 2019 7:26 pm
Forum: Ionic & Covalent Bonds
Topic: coulomb potential energy and Madelung constant, as well as lattice energy
Replies: 4
Views: 39

Re: coulomb potential energy and Madelung constant, as well as lattice energy

I hope these will not be on the test or I would definitely fail.:(
by Yiyang Jen Wang 4G
Sun Nov 03, 2019 7:24 pm
Forum: Ionic & Covalent Bonds
Topic: Strength and Length
Replies: 18
Views: 110

Re: Strength and Length

Longer bonds are easier to break. Shorter bonds are stronger since the attractions between the elements are stronger. Single bond is longer than double bond, and double bond is longer than triple bond. Therefore, single bond is weaker than double bond, and double bond is weaker than triple bond.
by Yiyang Jen Wang 4G
Sun Nov 03, 2019 7:18 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent
Replies: 14
Views: 104

Re: Ionic vs Covalent

ionic bond is usually between a metal and a nonmetal. Elements in ionic bonds donate and accept electrons (become ions) while in covalent bonds they share electrons.
by Yiyang Jen Wang 4G
Sun Nov 03, 2019 7:17 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent
Replies: 5
Views: 22

Re: Ionic and Covalent

Elements in ionic bond donate and accept electrons while elements in covalent bond share electrons. The difference in electronegativity is also higher for ionic bond. Ionic bond is usually between a metal and a nonmetal.
by Yiyang Jen Wang 4G
Mon Oct 28, 2019 9:06 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Octet Rules
Replies: 8
Views: 45

Re: Octet Rules

It just means that most elements prefer to have 8 valence electrons in order to stay stable. But many can have more or less than 8 especially when they bond to other elements.
by Yiyang Jen Wang 4G
Mon Oct 28, 2019 9:01 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Useful YouTube videos?
Replies: 6
Views: 38

Re: Useful YouTube videos?

Thanks for asking!! I found this helpful as well!
by Yiyang Jen Wang 4G
Mon Oct 28, 2019 9:00 pm
Forum: Properties of Light
Topic: Constant for Speed of Light
Replies: 14
Views: 86

Re: Constant for Speed of Light

2.998*10^8 m/s is definitely more accurate, but 3.0*10^8 m/s is also not wrong for sure. If we can use a calculator then using the more accurate one is definitely more recommend.
by Yiyang Jen Wang 4G
Mon Oct 28, 2019 8:54 pm
Forum: Properties of Light
Topic: Midterm formulas
Replies: 6
Views: 74

Re: Midterm formulas

Yes, I believe we will get formula sheet and periodic table just like we had for the test.
by Yiyang Jen Wang 4G
Fri Oct 25, 2019 2:09 am
Forum: Administrative Questions and Class Announcements
Topic: Homework week 4
Replies: 4
Views: 34

Re: Homework week 4

Since we haven’t really covered anything about chemical bonding in class, I believe that we should still do hw from the quantum world this week.
by Yiyang Jen Wang 4G
Fri Oct 18, 2019 2:34 am
Forum: *Shrodinger Equation
Topic: Nodal Planes
Replies: 6
Views: 30

Re: Nodal Planes

N,L,M L determines shape/angular momentum
N=1, L=0 s
N=2, L=0 s, 1 p
N=3, L=0 s, 1 p, 2 d
N=4, L=0 s, 1 p, 2 d, 3 f
by Yiyang Jen Wang 4G
Fri Oct 18, 2019 2:26 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Drawing Orbitals
Replies: 5
Views: 38

Re: Drawing Orbitals

You do not need to know how to draw! Although it might be really helpful if you can picture the orbitals in your head.
by Yiyang Jen Wang 4G
Fri Oct 18, 2019 2:24 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Advice for studying
Replies: 58
Views: 507

Re: Advice for studying

Step Up session is definitely recommended! For me I think it is easier to just go and listen than read through the textbook~
by Yiyang Jen Wang 4G
Fri Oct 18, 2019 2:21 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Spin State
Replies: 17
Views: 78

Re: Spin State

There's no universal notion of "up" or "down", they just represent the two directions. +/- is just for you to distinguish the difference between the two paired electrons. I believe it does not really matter which is which.
by Yiyang Jen Wang 4G
Fri Oct 18, 2019 2:09 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: G orbital
Replies: 6
Views: 42

Re: G orbital

It is possible that n can be larger and so that g orbital could exist, but since the electrons are so far away from the nucleus, the elements will be extremely unstable and will probably not exist under normal conditions. I don’t think we need to know that for the this class since it’s not even on t...
by Yiyang Jen Wang 4G
Mon Oct 14, 2019 12:11 am
Forum: Administrative Questions and Class Announcements
Topic: How to find my posts
Replies: 48
Views: 37869

Re: How to find my posts

Anybody knows whether Prof will post his lecture PowerPoint online or not? Where can I find it? I really need them for revising my notes! Thx
by Yiyang Jen Wang 4G
Sun Oct 13, 2019 11:50 pm
Forum: *Particle in a Box
Topic: Particle in A box
Replies: 8
Views: 106

Re: Particle in A box

Yeah I don’t think we need to know it for the text but it was really helpful at least for me to understand the concepts in this chapter.
by Yiyang Jen Wang 4G
Tue Oct 08, 2019 11:37 am
Forum: Properties of Light
Topic: Posts Per Week
Replies: 6
Views: 67

Re: Posts Per Week

Our TA said in the discussion that you can post/reply from Monday to Sunday to get the points for the week.
by Yiyang Jen Wang 4G
Tue Oct 08, 2019 11:33 am
Forum: Properties of Light
Topic: Light intensity
Replies: 10
Views: 75

Re: Light intensity

I think intensity is effected by amplitude. Higher amplitude will result in higher intensity which will cause the light to be brighter. But Plz correct me if I am wrong!
by Yiyang Jen Wang 4G
Tue Oct 08, 2019 11:23 am
Forum: *Black Body Radiation
Topic: Black Body
Replies: 5
Views: 51

Re: Black Body

I think professor mentioned in class that the perfect black body that can absorb all frequencies of light does not currently exist. Cuz if we can still see it, it must has reflected some sort of frequencies which are able to be detected by our eyes, or it will just be invisible. Plz correct me if I ...
by Yiyang Jen Wang 4G
Fri Oct 04, 2019 12:01 am
Forum: Limiting Reactant Calculations
Topic: Study Strategies/Youtube Videos
Replies: 14
Views: 150

Re: Study Strategies/Youtube Videos

Textbook has a lot of readings and sometimes it is hard to distinguish what is really important from all the various concepts. However, the resources that the professor provided are extremely helpful for the course and homework. Highly recommend going over them and using textbook as a supplementary ...
by Yiyang Jen Wang 4G
Thu Oct 03, 2019 2:18 am
Forum: Student Social/Study Group
Topic: Study Group Fall 2019
Replies: 32
Views: 1405

Re: Study Group Fall 2019

Study group will be so helpful! I felt like I’ve forgotten everything about chem:)
by Yiyang Jen Wang 4G
Thu Oct 03, 2019 2:09 am
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 155
Views: 86105

Re: Advice from a Medical Student [ENDORSED]

Thank you so much for sharing these. I am a 2nd year right now and was so stressed about being a premed student. I felt like I have so much to do, to get prepared but don’t even know how to start. Your advices are so helpful! I should really make a plan for myself.
by Yiyang Jen Wang 4G
Thu Oct 03, 2019 1:57 am
Forum: SI Units, Unit Conversions
Topic: Homework 2
Replies: 7
Views: 67

Re: Homework 2

I am not sure but I believe we will choose 5 questions for all the homework assignments in the future( from the weekly assigned topics) to turn in, but more practice is always highly recommend!
by Yiyang Jen Wang 4G
Thu Oct 03, 2019 1:48 am
Forum: SI Units, Unit Conversions
Topic: Calculator Question
Replies: 13
Views: 166

Re: Calculator Question

As long as it is not a graphing calculator you will be all good I guess. Mine was TI36x pro, and I’ve used it for many other classes that say “ no graphing calculator” in their syllabus. :) however I am not 100% sure, I hope it will work for this class!

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