Search found 53 matches
- Thu Dec 10, 2020 8:58 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Helpful Video (Acidic & Basic Salts)
- Replies: 4
- Views: 393
Helpful Video (Acidic & Basic Salts)
Here is a helpful video https://www.youtube.com/watch?v=MXTsUBC0Nlk on Acidic Basic and Neutral Salts
- Thu Dec 10, 2020 8:58 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Ionization of Acids
- Replies: 2
- Views: 166
Ionization of Acids
Can someone explain what it means to be completely ionized (in an aqueous solution eg H2O)?
- Thu Dec 10, 2020 8:57 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Strong Acid Question (How to Derive)
- Replies: 3
- Views: 204
Strong Acid Question (How to Derive)
Do we need to just memorize strong acids or is there a way to derive them from understanding atomic properties?
- Thu Dec 10, 2020 8:57 pm
- Forum: Properties & Structures of Inorganic & Organic Bases
- Topic: Strong Base Question
- Replies: 1
- Views: 213
Strong Base Question
How do you calculate which base is stronger when given two compounds?
- Thu Dec 10, 2020 8:56 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Strong Acid Question
- Replies: 2
- Views: 185
Strong Acid Question
How do you calculate which acid is stronger when given 2 compounds?
- Sun Dec 06, 2020 4:10 pm
- Forum: Hybridization
- Topic: Good video about hybridization
- Replies: 7
- Views: 455
Good video about hybridization
Here is a good video to watch on hybridization: https://www.youtube.com/watch?v=otYj92d7rB0
- Sun Dec 06, 2020 4:10 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Good video -- Coordination #
- Replies: 3
- Views: 269
Good video -- Coordination #
Here is a good video to watch on coordination compounds: https://www.youtube.com/watch?v=r4H5XjJPn58
- Sun Dec 06, 2020 4:09 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Oxidation # Question
- Replies: 4
- Views: 308
Oxidation # Question
What is the definition of oxidation number?
- Sun Dec 06, 2020 4:09 pm
- Forum: Biological Examples
- Topic: Most abundant coordination compound question
- Replies: 2
- Views: 209
Most abundant coordination compound question
What is the most abundant coordination compound found on Earth?
- Sun Dec 06, 2020 4:08 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Number Vs. Oxidation Sates Question
- Replies: 3
- Views: 287
Coordination Number Vs. Oxidation Sates Question
What is the difference between coordination numbers and oxidation states?
- Fri Nov 27, 2020 2:13 pm
- Forum: Biological Examples
- Topic: Examples of Square Planar Molecules?
- Replies: 9
- Views: 2657
Examples of Square Planar Molecules?
What are common molecules that have square planar shape? How does this shape affect their function?
- Fri Nov 27, 2020 2:13 pm
- Forum: Lewis Structures
- Topic: Question about AsO4 3- Lewis Structure
- Replies: 1
- Views: 130
Question about AsO4 3- Lewis Structure
I am drawing the following Lewis structure: AsO4 3-… why do we disrupt the octet rule for As to make this structure more stable? (Making a double bond) — making expanded octet for As… rather than just doing all single bonds and having it more unstable... Is accounting for stability more important th...
- Fri Nov 27, 2020 2:11 pm
- Forum: Hybridization
- Topic: Question about Hybridized Orbitals
- Replies: 5
- Views: 250
Question about Hybridized Orbitals
Lecture #23 question: What does Dr. Lavelle mean by the following: the energy gap between hybridized orbitals and un-hybridized orbitals are smaller than ones of two un-hybridized orbitals?
- Fri Nov 27, 2020 2:11 pm
- Forum: Sigma & Pi Bonds
- Topic: Main Difference between Sigma & Pi Bonds Q
- Replies: 4
- Views: 787
Main Difference between Sigma & Pi Bonds Q
What is the main difference between sigma and pi bonds?
- Fri Nov 27, 2020 2:10 pm
- Forum: Octet Exceptions
- Topic: Expanded Octet Question
- Replies: 8
- Views: 639
Expanded Octet Question
Can someone explain the concept of expanded octet. Why can Xe in XeF4 have an expanded octet? What qualities of Xe permit this?
- Fri Nov 20, 2020 5:49 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Question about Chem Community Posts
- Replies: 5
- Views: 277
Re: Question about Chem Community Posts
NVM lolll there are two pages of "My Post" -- I have 35 phew
Thank you all!
Thank you all!
- Fri Nov 20, 2020 5:35 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Question about Chem Community Posts
- Replies: 5
- Views: 277
Question about Chem Community Posts
It is end of Week 7 and I have 25 posts for Chem Community... am I on target? I forgot what week we started.
- Fri Nov 20, 2020 5:33 pm
- Forum: Lewis Structures
- Topic: Question on Radical -- SAPLING BOOK (Mistake in Answer Key)
- Replies: 6
- Views: 334
Question on Radical -- SAPLING BOOK (Mistake in Answer Key)
5. I am doing the following problem: 2C.1 Which of the following species are radicals? (a) NO2−… How is NO2- a radial? The book says it is… is this a mistake?
UPDATED --- The answer key in some books are incorrect. NO2- is NOT a radical.
UPDATED --- The answer key in some books are incorrect. NO2- is NOT a radical.
- Fri Nov 20, 2020 5:31 pm
- Forum: Lewis Structures
- Topic: Lewis Structure for Nitryl Chloride
- Replies: 1
- Views: 212
Lewis Structure for Nitryl Chloride
4. I am doing the following problem: 2B.15 Draw the Lewis structures that contribute to the resonance hybrid of nitryl chloride, ClNO2 (N is the central atom). How do you know the double bond goes to one of the Os and not the Cl?
- Fri Nov 20, 2020 5:31 pm
- Forum: Lewis Structures
- Topic: Lewis Structure for Glycine
- Replies: 3
- Views: 598
Lewis Structure for Glycine
3. I am drawing the Lewis Structure for glycine. How do we know which element bonds to which element with such a large structure?
- Fri Nov 20, 2020 5:31 pm
- Forum: Lewis Structures
- Topic: Midterm Q
- Replies: 2
- Views: 172
Midterm Q
2. I am doing the following problem: 2B.9 Draw the complete Lewis structure for each of the following compounds: (a) ammonium chloride; (b) potassium phosphide; (c) sodium hypochlorite. Will we need to know how to derive these formulas or will they be given to us?
- Fri Nov 20, 2020 5:30 pm
- Forum: Lewis Structures
- Topic: Central Atom Question
- Replies: 20
- Views: 1071
Central Atom Question
I am working on the following problem: Draw the Lewis Structure of NHF2. N is the central atom in this structure, but will H ever be a central atom in a molecule?
- Sun Nov 15, 2020 11:59 am
- Forum: Resonance Structures
- Topic: How do you start?? Resonance Structures
- Replies: 1
- Views: 1055
How do you start?? Resonance Structures
How do you determine resonance structures when given one structure? Are there specific steps you follow?
- Sun Nov 15, 2020 11:58 am
- Forum: Lewis Acids & Bases
- Topic: Midterm Content Question
- Replies: 3
- Views: 187
Midterm Content Question
Are Lewis bases and acids on the midterm?
- Sun Nov 15, 2020 11:57 am
- Forum: Formal Charge and Oxidation Numbers
- Topic: Oxidation # Defintion ?
- Replies: 1
- Views: 133
Oxidation # Defintion ?
How do you determine the oxidation number? For example how do you determine the number of chlorine in the percolate ion?
- Sun Nov 15, 2020 11:56 am
- Forum: Lewis Acids & Bases
- Topic: Explanation of Lewis acids & Bases
- Replies: 7
- Views: 3275
Explanation of Lewis acids & Bases
Can someone explain Lewis acids and bases. I am trying to figure out which one is the base and acid for the following reaction: BF3 + F- ——> BF4-
How do you know when a molecule can give or take an electron?
How do you know when a molecule can give or take an electron?
- Sun Nov 15, 2020 11:53 am
- Forum: Lewis Structures
- Topic: Sapling Question -- Formula of Ions
- Replies: 1
- Views: 116
Sapling Question -- Formula of Ions
1. I am working on the following problem: “…..However, the formulas of the nitrate ion and phosphate ion contain different numbers of oxygen atoms. This is also true for the formulas of the nitrite ion and phosphite ion. Draw the Lewis structures of the nitrite, nitrate, phosphite, and phosphate ion...
- Sun Nov 08, 2020 11:44 am
- Forum: Ionic & Covalent Bonds
- Topic: Question about bond Length
- Replies: 6
- Views: 226
Question about bond Length
How can you determine bond lengths given a certain bond?
- Sun Nov 08, 2020 11:44 am
- Forum: Resonance Structures
- Topic: Question about Resonance Def
- Replies: 5
- Views: 326
Question about Resonance Def
Can someone explain what resonance is?
- Sun Nov 08, 2020 11:43 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Tech & Electron Configuration
- Replies: 2
- Views: 149
Tech & Electron Configuration
What type of technology is used to determine the placement of electrons for a certain element?
- Sun Nov 08, 2020 11:43 am
- Forum: Quantum Numbers and The H-Atom
- Topic: Principle Quantum #
- Replies: 3
- Views: 181
Principle Quantum #
I am still a bit confused with the concept of principle quantum numbers. Is n = the # of shells for a certain element (and placement for electrons?) How does n relate to the valence electrons/shell?
- Sun Nov 08, 2020 11:42 am
- Forum: Lewis Structures
- Topic: Lone Pairs Question
- Replies: 22
- Views: 1528
Lone Pairs Question
1. I am doing the following Sapling problem: Draw the structure of CH2O, including lone pairs. Can someone explain to me what lone pairs are?
- Sat Oct 31, 2020 9:53 am
- Forum: SI Units, Unit Conversions
- Topic: eV to Joules (Defining these Units) Question
- Replies: 12
- Views: 1376
eV to Joules (Defining these Units) Question
Can someone help me define a unit? What is eV and how does it relate to the units Joules?
- Sat Oct 31, 2020 9:52 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: History of This Equation Question
- Replies: 2
- Views: 116
History of This Equation Question
How was the Heisenberg uncertainty principle derived? I am still so fascinated how humans can derive these equations…
- Sat Oct 31, 2020 9:52 am
- Forum: SI Units, Unit Conversions
- Topic: SI Units & US
- Replies: 4
- Views: 187
SI Units & US
This is a random question that popped into my head while doing SI units. Why hasn’t the US converted to SI units?
- Sat Oct 31, 2020 9:51 am
- Forum: Trends in The Periodic Table
- Topic: Periodic Table & Electron Affinity
- Replies: 11
- Views: 681
Periodic Table & Electron Affinity
Can someone explain how to use the periodic table to determine electron affinity?
- Sat Oct 31, 2020 9:49 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Ground State vs. Excited State Question
- Replies: 8
- Views: 1318
Ground State vs. Excited State Question
I am working on the following problem: “Identify the neutral element represented by this excited-state electron configuration, then write the ground-state electron configuration for that element. Excited State: 1s2 2s2 2p2 3s1. Can someone explain the difference between ground state and excited state?
- Sun Oct 25, 2020 3:38 pm
- Forum: SI Units, Unit Conversions
- Topic: Can someone explain Avogrado's #?
- Replies: 8
- Views: 837
Can someone explain Avogrado's #?
Avogrado's Constant is 6.02214x10^23 mol-1 Avogadro's number, number of units in one mole of any substance (defined as its molecular weight in grams), equal to 6.02214076 × 10^23. The units may be electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the...
- Sun Oct 25, 2020 3:35 pm
- Forum: Photoelectric Effect
- Topic: Question about Photoelectric Effect (Work Function)
- Replies: 2
- Views: 162
Question about Photoelectric Effect (Work Function)
How is work function for specific materials calculated? What technology is used to find work function?
- Sun Oct 25, 2020 3:34 pm
- Forum: Properties of Light
- Topic: Midterm
- Replies: 42
- Views: 1352
Re: Midterm
So we're going to be in a zoom call with our whole discussion group? Doesn't that mean that we'll be able to see each other's work? Yes, I'm pretty sure we will be in a zoom call with our group, however I think it will be quite hard to cheat off of each other since the TA will be watching your scre...
- Sun Oct 25, 2020 1:51 pm
- Forum: Empirical & Molecular Formulas
- Topic: Helpful Video -- Empirical Formula
- Replies: 3
- Views: 371
Helpful Video -- Empirical Formula
https://www.youtube.com/watch?v=JeSSucG-CVw
Hey everyone,
I found this Youtube video to be really helpful when reviewing Empirical formulas!
Hey everyone,
I found this Youtube video to be really helpful when reviewing Empirical formulas!
- Sun Oct 25, 2020 1:50 pm
- Forum: Administrative Questions and Class Announcements
- Topic: CCLE DOWN
- Replies: 6
- Views: 410
CCLE DOWN
Hi there,
Is there anyway to access our Sapling textbook without going through CCLE?
Is there anyway to access our Sapling textbook without going through CCLE?
- Sat Oct 17, 2020 7:18 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Tutoring? [ENDORSED]
- Replies: 121
- Views: 233596
Re: Tutoring? [ENDORSED]
Does anyone have good tutoring options now that we're gonna be online for the rest of the semester and most likely the rest of the year? Preferably for students not in westwood/on campus. I really recommend utilizing Dr. Lavelle's programs put in place: Step Up program and UA help Workshops! Also, ...
- Sat Oct 17, 2020 7:07 pm
- Forum: Administrative Questions and Class Announcements
- Topic: CC on BruinCast Lectures
- Replies: 1
- Views: 60
Re: CC on BruinCast Lectures
I don't think CC is available for Dr. Lavelle's videos. We should ask him if the BruinCast crew can enable them!
- Sat Oct 17, 2020 7:06 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Petition to Bring Music Back To Lectures [ENDORSED]
- Replies: 34
- Views: 1197
Re: Petition to Bring Music Back To Lectures [ENDORSED]
Maybe could Dr. Lavelle say the title of the song before lecture? I am so curious haha! Thank you Dr. Lavelle for being so interactive this online quarter!
- Sat Oct 17, 2020 7:04 pm
- Forum: Administrative Questions and Class Announcements
- Topic: STEP UP SESSIONS
- Replies: 3
- Views: 60
STEP UP SESSIONS
For those who have been to the Step Up Sessions, how long did they last for? 1 hr? 1.5 hrs?
- Sat Oct 17, 2020 6:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Where can I buy a webcam for a reasonable price?
- Replies: 60
- Views: 3470
Re: Where can I buy a webcam for a reasonable price?
Amazon! Also Dr. Lavelle emailed us a link to good webcams!
- Sat Oct 10, 2020 12:25 pm
- Forum: Student Social/Study Group
- Topic: Study Group On Campus
- Replies: 7
- Views: 398
Study Group On Campus
Hi there,
I was wondering if there are some students on campus taking 14A this quarter. Maybe we can do Zoom sessions and social distanced study groups here @ UCLA! Please reply if interested.
I was wondering if there are some students on campus taking 14A this quarter. Maybe we can do Zoom sessions and social distanced study groups here @ UCLA! Please reply if interested.
- Sat Oct 10, 2020 11:53 am
- Forum: General Science Questions
- Topic: The Concept of Moles
- Replies: 3
- Views: 161
Re: The Concept of Moles
Thank you so much! And when we calculate molar mass, we are determining the mass based on the size of the atoms of an element?
- Sat Oct 10, 2020 11:49 am
- Forum: Empirical & Molecular Formulas
- Topic: How to Determine Molar Mass? (salping Week 1)
- Replies: 3
- Views: 77
How to Determine Molar Mass? (salping Week 1)
I have a question for the Sapling Week 1 hw. For problem #10, 2-butanone was in the problem. We were given the structure and name. How do you find the molar mass given these two pieces of info?
- Sat Oct 10, 2020 9:42 am
- Forum: General Science Questions
- Topic: Textbook
- Replies: 9
- Views: 555
Re: Textbook
I also found it helpful to reload the page when you are on CCLE and another tab opens. This worked for me for Launch Pad as well for the 7 series.
- Sat Oct 10, 2020 9:40 am
- Forum: Administrative Questions and Class Announcements
- Topic: Step Up Sessions
- Replies: 71
- Views: 6480
Re: Step Up Sessions
How many students are in a Step Up session?
- Sat Oct 10, 2020 9:37 am
- Forum: General Science Questions
- Topic: The Concept of Moles
- Replies: 3
- Views: 161
The Concept of Moles
Can someone explain what a mole is. I still am having a hard time grasping this number.