Search found 46 matches

by Elizabeth Harty 3A
Mon Nov 18, 2019 8:06 pm
Forum: Coordinate Covalent Bonds
Topic: coordinate covalent bond
Replies: 8
Views: 45

Re: coordinate covalent bond

Coordinate covalent bonds also often happen when there are exceptions to the octet rule like for boron.
by Elizabeth Harty 3A
Mon Nov 18, 2019 8:05 pm
Forum: Dipole Moments
Topic: define
Replies: 1
Views: 5

define

What exactly is a dipole moment?
by Elizabeth Harty 3A
Mon Nov 18, 2019 8:04 pm
Forum: Ionic & Covalent Bonds
Topic: Lone pairs
Replies: 4
Views: 16

Lone pairs

Why are lone pairs more likely to be found in certain places?
by Elizabeth Harty 3A
Mon Nov 18, 2019 8:02 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2 Length
Replies: 9
Views: 40

Re: Test 2 Length

Why are lone pairs more likely to be found in certain places?
by Elizabeth Harty 3A
Mon Nov 18, 2019 8:01 pm
Forum: Lewis Structures
Topic: double and triple bonds
Replies: 5
Views: 19

Re: double and triple bonds

The formal charges should be minimized but they also have to add up to the overall charge of the molecule.
by Elizabeth Harty 3A
Mon Nov 18, 2019 8:00 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: dipole dipole
Replies: 3
Views: 10

Re: dipole dipole

You might look at the sizes and the electronegativity differences
by Elizabeth Harty 3A
Mon Nov 18, 2019 7:59 pm
Forum: Lewis Structures
Topic: radicals
Replies: 3
Views: 11

Re: radicals

They have an odd number of electrons and are highly reactive
by Elizabeth Harty 3A
Mon Nov 11, 2019 10:59 am
Forum: General Science Questions
Topic: Test 2
Replies: 20
Views: 116

Re: Test 2

Are all tests worth the same amount? (besides midterm of course)
by Elizabeth Harty 3A
Mon Nov 11, 2019 10:57 am
Forum: Resonance Structures
Topic: how to draw
Replies: 6
Views: 17

Re: how to draw

My TA said if you do the shorthand (with the arrows) instead of actually drawing all the structures you should write an explanation to show that you know how many there are
by Elizabeth Harty 3A
Mon Nov 11, 2019 10:56 am
Forum: Lewis Structures
Topic: Lewis Dot Structures
Replies: 7
Views: 41

Re: Lewis Dot Structures

At this point in what we have learned I don't think it matters too much.
by Elizabeth Harty 3A
Wed Nov 06, 2019 5:28 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect vs. De Broglie
Replies: 8
Views: 70

Re: Photoelectric Effect vs. De Broglie

I thought that the units for joules had the second to the power of negative 2?
by Elizabeth Harty 3A
Wed Nov 06, 2019 12:27 pm
Forum: Quantum Numbers and The H-Atom
Topic: Equations we need for midterm
Replies: 6
Views: 73

Re: Equations we need for midterm

is momentum mass times velocity?
by Elizabeth Harty 3A
Sat Nov 02, 2019 5:15 pm
Forum: Lewis Structures
Topic: Double Bonds vs. Lone Pairs
Replies: 2
Views: 10

Re: Double Bonds vs. Lone Pairs

It depends on what the compound is and how you can minimize formal charge
by Elizabeth Harty 3A
Sat Nov 02, 2019 5:11 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Copper and Chromium Exception
Replies: 2
Views: 12

Re: Copper and Chromium Exception

For these you just add one to the d orbital and take one from the 4s to make it 4s^1
by Elizabeth Harty 3A
Sat Nov 02, 2019 5:09 pm
Forum: Lewis Structures
Topic: Resonance Hybrids
Replies: 3
Views: 16

Re: Resonance Hybrids

A resonance hybrid is used to show all of the resonance structures combined
by Elizabeth Harty 3A
Sat Nov 02, 2019 5:06 pm
Forum: Dipole Moments
Topic: Definition
Replies: 5
Views: 26

Re: Definition

It happens when there is unequal charge density or separation of positive and negative charge. You can use it to measure polarity of a molecule
by Elizabeth Harty 3A
Sat Nov 02, 2019 5:03 pm
Forum: Properties of Electrons
Topic: Resonance Structures
Replies: 2
Views: 17

Re: Resonance Structures

I'm pretty sure the formal charge doesn't change because you aren't changing connectivity just arrangement? Also you can use the dotted lines to draw resonance to show the change in bonds.
by Elizabeth Harty 3A
Sat Nov 02, 2019 5:01 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Minimize formal charge of whole molecule?
Replies: 7
Views: 29

Re: Minimize formal charge of whole molecule?

You want to overall formal charge to equal zero when you take into consideration all formal charges of atoms in species
by Elizabeth Harty 3A
Sun Oct 27, 2019 5:44 pm
Forum: Lewis Structures
Topic: Dots vs Lines in Lewis Structures
Replies: 6
Views: 37

Re: Dots vs Lines in Lewis Structures

I'm pretty sure you're always supposed to use lines or else it could be confused as lone pairs.
by Elizabeth Harty 3A
Sun Oct 27, 2019 5:43 pm
Forum: Formal Charge and Oxidation Numbers
Topic: placement of the negative sign on charges
Replies: 4
Views: 20

Re: placement of the negative sign on charges

I'm pretty sure it matters which way you say it and they can't be rude interchangeably but I might be wrong...
by Elizabeth Harty 3A
Sun Oct 27, 2019 5:42 pm
Forum: Octet Exceptions
Topic: Exceeding the Octet Rule
Replies: 5
Views: 54

Re: Exceeding the Octet Rule

I think it depends which atoms are being bonded.
by Elizabeth Harty 3A
Sun Oct 27, 2019 5:40 pm
Forum: Trends in The Periodic Table
Topic: Central Atom
Replies: 13
Views: 35

Re: Central Atom

Also if you have something which has one of one species and 4 of another it is almost always the with which is less frequent (if you think about number of bonds and octet rule).
by Elizabeth Harty 3A
Sun Oct 27, 2019 5:39 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Exceptions to Electron Configuration
Replies: 7
Views: 30

Re: Exceptions to Electron Configuration

Pretty sure copper and chromium are the only exceptions we're covering with their configurations having 4s^1 instead of 4s^2. But didn't we say something about always writing the s orbitals after the d orbitals when doing electron configurations?
by Elizabeth Harty 3A
Sun Oct 27, 2019 5:38 pm
Forum: Trends in The Periodic Table
Topic: Zeff and ionization energy
Replies: 4
Views: 25

Re: Zeff and ionization energy

Ionization energy is the minimum energy required to remove one mol of electrons from one mol of an atom. Therefore, the tighter the hold on the electrons, the higher the ionization energy is as it is more difficult to remove said valence electron. Species with higher effective nuclear charge have a ...
by Elizabeth Harty 3A
Sun Oct 20, 2019 8:50 pm
Forum: Trends in The Periodic Table
Topic: Study Buddies?
Replies: 8
Views: 59

Re: Study Buddies?

Yesss. my email is esineadh@ucla.edu
by Elizabeth Harty 3A
Sun Oct 20, 2019 8:49 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 62
Views: 18493

Re: Final Jitters

Its always helpful to get out of studying and do something else for a little like have a snack or go exercise!
by Elizabeth Harty 3A
Sun Oct 20, 2019 8:47 pm
Forum: Quantum Numbers and The H-Atom
Topic: 1D.21
Replies: 5
Views: 23

Re: 1D.21

I understand the principal quantum number part, but how does the L value help?
by Elizabeth Harty 3A
Sun Oct 20, 2019 8:45 pm
Forum: Trends in The Periodic Table
Topic: ionization energy
Replies: 11
Views: 270

Re: ionization energy

Yes and for the periodic trends you can always determine the trend based on stuff you already know (for instance atomic radius). As atomic radius increases as you go down a group, the nuclear pull on the outer electrons is less and thus the ionization energy is lower. Moreover, as you go across a pe...
by Elizabeth Harty 3A
Sun Oct 20, 2019 8:41 pm
Forum: Einstein Equation
Topic: 1B.9 help
Replies: 4
Views: 27

Re: 1B.9 help

You would use the equation E=hcλ and then you would multiply 32 by 2 because it is 2 seconds. You would then use the molar equation to get the number of moles of photons.
by Elizabeth Harty 3A
Sun Oct 20, 2019 8:37 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Friday's lecture (4s and 3d)
Replies: 3
Views: 20

Re: Friday's lecture (4s and 3d)

You always want to achieve the the lowest energy so you fill the lower energy orbital, or the 4s orbital. And you can't fill the 3d orbital until you have filled the other ones first.
by Elizabeth Harty 3A
Sun Oct 13, 2019 10:55 am
Forum: Empirical & Molecular Formulas
Topic: Nomenclature
Replies: 10
Views: 62

Re: Nomenclature

I'm kinda confused though because in some of the homework problems we are asked to name compounds but we haven't covered that yet.
by Elizabeth Harty 3A
Sun Oct 13, 2019 10:52 am
Forum: Photoelectric Effect
Topic: Removing an atom
Replies: 3
Views: 19

Re: Removing an atom

How do you find how much energy is needed to remove an electron from a particular atom, such as an oxygen atom? I'm pretty sure that depends on the ionization energy for the particular energy state. Those are usually given unless it is some energy or thermodynamics equations where you are being ask...
by Elizabeth Harty 3A
Sun Oct 13, 2019 10:47 am
Forum: SI Units, Unit Conversions
Topic: Practice Problems?
Replies: 11
Views: 122

Re: Practice Problems?

For the peer learning groups/sessions, do you come ready with your own questions, do other people lead what you're going to be talking about? Or do you guys all do it together?
by Elizabeth Harty 3A
Sun Oct 13, 2019 10:46 am
Forum: Einstein Equation
Topic: Numbers to memorize [ENDORSED]
Replies: 37
Views: 992

Re: Numbers to memorize [ENDORSED]

Do we have to memorize equations for the test then?
by Elizabeth Harty 3A
Sun Oct 13, 2019 10:44 am
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 6
Views: 65

Re: Photoelectric Effect

What were the wavelengths of light ( I think it was white vs blue vs red) that were not able to eject an electron? I can't seem to remember
by Elizabeth Harty 3A
Sun Oct 13, 2019 10:39 am
Forum: Properties of Electrons
Topic: Constructive vs Destructive Inference
Replies: 4
Views: 27

Re: Constructive vs Destructive Inference

You can also use the concept of destructive interference to explain why electrons can only be found in certain energy levels (because destructive interference cancels the wave functions).

https://www.sciencedirect.com/topics/ma ... terference

^ Here is another good link.
by Elizabeth Harty 3A
Fri Oct 04, 2019 10:31 am
Forum: Limiting Reactant Calculations
Topic: Homework Week 1
Replies: 18
Views: 136

Re: Homework Week 1

I don't think you have to write out the problem before you answer it
by Elizabeth Harty 3A
Fri Oct 04, 2019 10:29 am
Forum: Limiting Reactant Calculations
Topic: Study Strategies/Youtube Videos
Replies: 14
Views: 102

Re: Study Strategies/Youtube Videos

Mr Anderson's chem on youtube is also pretty straightforward and helpful!
by Elizabeth Harty 3A
Fri Oct 04, 2019 10:29 am
Forum: Limiting Reactant Calculations
Topic: Understanding equations
Replies: 5
Views: 30

Re: Understanding equations

I'm pretty sure for limiting reactant problems (unless they tell you right away by indicating that one of the substances is "in excess") the only way you can determine which compound is the limiting reagent is to calculate the amount of mols and then divide by the stoichiometric coefficien...
by Elizabeth Harty 3A
Fri Oct 04, 2019 10:26 am
Forum: Empirical & Molecular Formulas
Topic: Empirical Formula Purpose
Replies: 13
Views: 103

Re: Empirical Formula Purpose

Can someone explain the concept of molecular formulas and how they differ from empirical formulas?
by Elizabeth Harty 3A
Fri Oct 04, 2019 10:24 am
Forum: Empirical & Molecular Formulas
Topic: When should one start rounding in a problem?
Replies: 11
Views: 71

Re: When should one start rounding in a problem?

If you are waiting to round your answer until the end of the problem, how do you know how may decimal places/sig figs to use?
by Elizabeth Harty 3A
Fri Oct 04, 2019 10:21 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Aqueous, solid, gas
Replies: 11
Views: 78

Re: Aqueous, solid, gas

What is the difference between being aqueous and liquid?
by Elizabeth Harty 3A
Fri Oct 04, 2019 10:19 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Aqueous, solid, gas
Replies: 11
Views: 78

Re: Aqueous, solid, gas

What is the difference between being aqueous and liquid?

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