Search found 38 matches

by noelle_lipschutz_3F
Fri Nov 20, 2020 5:49 pm
Forum: Administrative Questions and Class Announcements
Topic: Question about Chem Community Posts
Replies: 5
Views: 24

Re: Question about Chem Community Posts

NVM lolll there are two pages of "My Post" -- I have 35 phew

Thank you all!
by noelle_lipschutz_3F
Fri Nov 20, 2020 5:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Question about Chem Community Posts
Replies: 5
Views: 24

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.
by noelle_lipschutz_3F
Fri Nov 20, 2020 5:33 pm
Forum: Lewis Structures
Topic: Question on Radical -- SAPLING BOOK (Mistake in Answer Key)
Replies: 4
Views: 30

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.
by noelle_lipschutz_3F
Fri Nov 20, 2020 5:31 pm
Forum: Lewis Structures
Topic: Lewis Structure for Nitryl Chloride
Replies: 1
Views: 13

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?
by noelle_lipschutz_3F
Fri Nov 20, 2020 5:31 pm
Forum: Lewis Structures
Topic: Lewis Structure for Glycine
Replies: 3
Views: 14

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?
by noelle_lipschutz_3F
Fri Nov 20, 2020 5:31 pm
Forum: Lewis Structures
Topic: Midterm Q
Replies: 2
Views: 34

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?
by noelle_lipschutz_3F
Fri Nov 20, 2020 5:30 pm
Forum: Lewis Structures
Topic: Central Atom Question
Replies: 20
Views: 68

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?
by noelle_lipschutz_3F
Sun Nov 15, 2020 11:59 am
Forum: Resonance Structures
Topic: How do you start?? Resonance Structures
Replies: 1
Views: 19

How do you start?? Resonance Structures

How do you determine resonance structures when given one structure? Are there specific steps you follow?
by noelle_lipschutz_3F
Sun Nov 15, 2020 11:58 am
Forum: Lewis Acids & Bases
Topic: Midterm Content Question
Replies: 3
Views: 12

Midterm Content Question

Are Lewis bases and acids on the midterm?
by noelle_lipschutz_3F
Sun Nov 15, 2020 11:57 am
Forum: Formal Charge and Oxidation Numbers
Topic: Oxidation # Defintion ?
Replies: 1
Views: 17

Oxidation # Defintion ?

How do you determine the oxidation number? For example how do you determine the number of chlorine in the percolate ion?
by noelle_lipschutz_3F
Sun Nov 15, 2020 11:56 am
Forum: Lewis Acids & Bases
Topic: Explanation of Lewis acids & Bases
Replies: 7
Views: 28

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?
by noelle_lipschutz_3F
Sun Nov 15, 2020 11:53 am
Forum: Lewis Structures
Topic: Sapling Question -- Formula of Ions
Replies: 1
Views: 21

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...
by noelle_lipschutz_3F
Sun Nov 08, 2020 11:44 am
Forum: Ionic & Covalent Bonds
Topic: Question about bond Length
Replies: 6
Views: 34

Question about bond Length

How can you determine bond lengths given a certain bond?
by noelle_lipschutz_3F
Sun Nov 08, 2020 11:44 am
Forum: Resonance Structures
Topic: Question about Resonance Def
Replies: 5
Views: 18

Question about Resonance Def

Can someone explain what resonance is?
by noelle_lipschutz_3F
Sun Nov 08, 2020 11:43 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Tech & Electron Configuration
Replies: 2
Views: 15

Tech & Electron Configuration

What type of technology is used to determine the placement of electrons for a certain element?
by noelle_lipschutz_3F
Sun Nov 08, 2020 11:43 am
Forum: Quantum Numbers and The H-Atom
Topic: Principle Quantum #
Replies: 3
Views: 16

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?
by noelle_lipschutz_3F
Sun Nov 08, 2020 11:42 am
Forum: Lewis Structures
Topic: Lone Pairs Question
Replies: 22
Views: 79

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?
by noelle_lipschutz_3F
Sat Oct 31, 2020 9:53 am
Forum: SI Units, Unit Conversions
Topic: eV to Joules (Defining these Units) Question
Replies: 12
Views: 57

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?
by noelle_lipschutz_3F
Sat Oct 31, 2020 9:52 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: History of This Equation Question
Replies: 2
Views: 25

History of This Equation Question

How was the Heisenberg uncertainty principle derived? I am still so fascinated how humans can derive these equations…
by noelle_lipschutz_3F
Sat Oct 31, 2020 9:52 am
Forum: SI Units, Unit Conversions
Topic: SI Units & US
Replies: 4
Views: 24

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?
by noelle_lipschutz_3F
Sat Oct 31, 2020 9:51 am
Forum: Trends in The Periodic Table
Topic: Periodic Table & Electron Affinity
Replies: 11
Views: 39

Periodic Table & Electron Affinity

Can someone explain how to use the periodic table to determine electron affinity?
by noelle_lipschutz_3F
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: 36

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?
by noelle_lipschutz_3F
Sun Oct 25, 2020 3:38 pm
Forum: SI Units, Unit Conversions
Topic: Can someone explain Avogrado's #?
Replies: 8
Views: 63

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...
by noelle_lipschutz_3F
Sun Oct 25, 2020 3:35 pm
Forum: Photoelectric Effect
Topic: Question about Photoelectric Effect (Work Function)
Replies: 2
Views: 26

Question about Photoelectric Effect (Work Function)

How is work function for specific materials calculated? What technology is used to find work function?
by noelle_lipschutz_3F
Sun Oct 25, 2020 3:34 pm
Forum: Properties of Light
Topic: Midterm
Replies: 42
Views: 368

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...
by noelle_lipschutz_3F
Sun Oct 25, 2020 1:51 pm
Forum: Empirical & Molecular Formulas
Topic: Helpful Video -- Empirical Formula
Replies: 1
Views: 18

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!
by noelle_lipschutz_3F
Sun Oct 25, 2020 1:50 pm
Forum: Administrative Questions and Class Announcements
Topic: CCLE DOWN
Replies: 6
Views: 53

CCLE DOWN

Hi there,

Is there anyway to access our Sapling textbook without going through CCLE?
by noelle_lipschutz_3F
Sat Oct 17, 2020 7:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Tutoring? [ENDORSED]
Replies: 75
Views: 72406

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, ...
by noelle_lipschutz_3F
Sat Oct 17, 2020 7:07 pm
Forum: Administrative Questions and Class Announcements
Topic: CC on BruinCast Lectures
Replies: 1
Views: 21

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!
by noelle_lipschutz_3F
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: 524

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!
by noelle_lipschutz_3F
Sat Oct 17, 2020 7:04 pm
Forum: Administrative Questions and Class Announcements
Topic: STEP UP SESSIONS
Replies: 3
Views: 19

STEP UP SESSIONS

For those who have been to the Step Up Sessions, how long did they last for? 1 hr? 1.5 hrs?
by noelle_lipschutz_3F
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: 912

Re: Where can I buy a webcam for a reasonable price?

Amazon! Also Dr. Lavelle emailed us a link to good webcams!
by noelle_lipschutz_3F
Sat Oct 10, 2020 12:25 pm
Forum: Student Social/Study Group
Topic: Study Group On Campus
Replies: 5
Views: 47

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.
by noelle_lipschutz_3F
Sat Oct 10, 2020 11:53 am
Forum: General Science Questions
Topic: The Concept of Moles
Replies: 3
Views: 45

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?
by noelle_lipschutz_3F
Sat Oct 10, 2020 11:49 am
Forum: Empirical & Molecular Formulas
Topic: How to Determine Molar Mass? (salping Week 1)
Replies: 3
Views: 34

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?
by noelle_lipschutz_3F
Sat Oct 10, 2020 9:42 am
Forum: General Science Questions
Topic: Textbook
Replies: 9
Views: 116

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.
by noelle_lipschutz_3F
Sat Oct 10, 2020 9:40 am
Forum: Administrative Questions and Class Announcements
Topic: Step Up Sessions
Replies: 71
Views: 4352

Re: Step Up Sessions

How many students are in a Step Up session?
by noelle_lipschutz_3F
Sat Oct 10, 2020 9:37 am
Forum: General Science Questions
Topic: The Concept of Moles
Replies: 3
Views: 45

The Concept of Moles

Can someone explain what a mole is. I still am having a hard time grasping this number.

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