Search found 34 matches

by Megan_1F
Fri Nov 15, 2019 9:50 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing power vs polarizability
Replies: 5
Views: 14

Re: Polarizing power vs polarizability

Typically, anions are polarized and cations are the polarizing power. Polarizability follow the trend of atomic radius. When you increase the size, you increase the polarizable properties.
by Megan_1F
Fri Nov 15, 2019 9:44 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 8
Views: 30

Re: Formal Charge

I would recommend writing it small right next to each atom so you can make sure you know which formal charge is assigned to which atom.
by Megan_1F
Fri Nov 15, 2019 9:43 pm
Forum: Octet Exceptions
Topic: Reasoning for Octet Exception
Replies: 9
Views: 26

Re: Reasoning for Octet Exception

Row 3 and beyond can have an expanded octet because it's in the 3rd energy level - S, P, and D blocks.
by Megan_1F
Fri Nov 15, 2019 9:41 pm
Forum: Dipole Moments
Topic: Shape of Molecules affect boiling point?
Replies: 7
Views: 14

Re: Shape of Molecules affect boiling point?

Boiling points depend on the strength of intermolecular forces. Thus, because rod shapes have more surface area, which means more area to have Van DerWaals forces between rod shaped molecules, it will have a higher boiling point.
by Megan_1F
Fri Nov 15, 2019 9:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar vs Nonpolar Example
Replies: 3
Views: 18

Re: Polar vs Nonpolar Example

The trans version will have the dipoles canceling each other out (opposite ends), thus there is no dipole moment and the molecule is Nonpolar. In the cis version, the dipoles do not cancel each other out, thus creating a dipole moment making the molecule polar.
by Megan_1F
Fri Nov 08, 2019 5:12 pm
Forum: Bond Lengths & Energies
Topic: Test 2 Topics
Replies: 19
Views: 132

Re: Test 2 Topics

Test 2 will be during your discussion on week 8. I believe it should cover the rest of bonding and whatever we learn from then till week 8.
by Megan_1F
Fri Nov 08, 2019 5:10 pm
Forum: Dipole Moments
Topic: Dipole Moment
Replies: 3
Views: 34

Re: Dipole Moment

There may be dipole moments in all types of bonds. Some non polar bonds may have a small dipole, but not a large enough difference in electronegativity that one atom donates all i's electrons to another. Just an unequal sharing of electrons that result in a slightly positive and negative charge.
by Megan_1F
Fri Nov 08, 2019 5:08 pm
Forum: Lewis Structures
Topic: Expanded Octet
Replies: 4
Views: 33

Re: Expanded Octet

Yes, expanded octets start from the 3rd row because the 3rd energy level can have the d block sub shell.
by Megan_1F
Fri Nov 08, 2019 5:06 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Electron configuration
Replies: 7
Views: 44

Re: Electron configuration

It is important to note that the sugbshells increase in energy going from s<p<d<f.
by Megan_1F
Fri Nov 08, 2019 5:04 pm
Forum: Electronegativity
Topic: Ionic or covalent?
Replies: 17
Views: 99

Re: Ionic or covalent?

A bond is normally ionic if the two atoms are on the far left and far right of the periodic table. Knowing the trends of the periodic table, one can assume that if two elements are near each other, they must have similar electronegativities, and thus would form a covalent bond.
by Megan_1F
Sun Nov 03, 2019 7:38 pm
Forum: Resonance Structures
Topic: Resonance structures
Replies: 9
Views: 34

Re: Resonance structures

the actual structure to a molecule with a resonance structure is a hybrid of its resonance structures.
by Megan_1F
Sun Nov 03, 2019 7:30 pm
Forum: *Shrodinger Equation
Topic: Hamiltonian
Replies: 2
Views: 21

Re: Hamiltonian

What exactly is an operator? In terms of a Hamiltonian?
by Megan_1F
Sun Nov 03, 2019 7:29 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: What are the octet exceptions?
Replies: 11
Views: 54

Re: What are the octet exceptions?

Elements in the 3p block can have an expanded octet.
by Megan_1F
Sun Nov 03, 2019 7:28 pm
Forum: Trends in The Periodic Table
Topic: Electronegativity vs. Electron Affinity
Replies: 3
Views: 18

Re: Electronegativity vs. Electron Affinity

Does electron affinity have any correlation with potential energy in an atom when it receives electrons - releases energy?
by Megan_1F
Sun Nov 03, 2019 6:25 pm
Forum: Ionic & Covalent Bonds
Topic: Drawing Ionic Compunds
Replies: 7
Views: 26

Re: Drawing Ionic Compunds

To draw an ionic lewis structure, you separately draw out each element in their own brackets.
by Megan_1F
Mon Oct 28, 2019 10:11 am
Forum: Lewis Structures
Topic: Lewis Structure of Ions
Replies: 6
Views: 25

Re: Lewis Structure of Ions

Yes, you need the brackets to indicate the charge of the ion.

Completely unrelated, but does anyone know what the Midterm covers up to?
by Megan_1F
Mon Oct 28, 2019 10:08 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Drawing Orbitals and Electron Spins
Replies: 2
Views: 20

Re: Drawing Orbitals and Electron Spins

Unless it asks for the spin, I would just write the configuration with [noble gas] sub shells after. However, drawing out the spins and the levels may help to visualize.
by Megan_1F
Mon Oct 28, 2019 10:06 am
Forum: Trends in The Periodic Table
Topic: Electronegativity vs. Electron affinity
Replies: 8
Views: 43

Re: Electronegativity vs. Electron affinity

I tend to associate electronegativity with covalent bonding and electron affinity with ionic bonding. Both have the same trends in the periodic table.
by Megan_1F
Mon Oct 28, 2019 10:04 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration Special Cases
Replies: 6
Views: 32

Re: Electron Configuration Special Cases

Yes, I think we only need to focus on chromium and copper as the two exceptions. Lavelle continues to say in class that 14A is focussed primarily on the "life science elements." I believe he mentioned in class that we must know the s and p blocks as well as the first row of the d block.
by Megan_1F
Mon Oct 28, 2019 10:00 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Question about the Principles on Tests
Replies: 5
Views: 27

Re: Question about the Principles on Tests

I agree. It's best to know these principles so you can apply this when needed on the test!
by Megan_1F
Fri Oct 18, 2019 11:29 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: ION WITH +1
Replies: 4
Views: 223

Re: ION WITH +1

Cations have a plus to indicate that the atom is positively charged because it lost electrons.
by Megan_1F
Fri Oct 18, 2019 11:27 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Momentum
Replies: 7
Views: 53

Re: Momentum

We most likely will have to calculate momentum to solve for position or wavelength.
by Megan_1F
Fri Oct 18, 2019 11:23 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: quantum number n, l, m
Replies: 13
Views: 71

Re: quantum number n, l, m

Can someone please explain what Px, Py, Pz are and how they relate to -1,0,1?
by Megan_1F
Fri Oct 18, 2019 11:21 am
Forum: *Shrodinger Equation
Topic: Negative sign in Equation
Replies: 4
Views: 29

Re: Negative sign in Equation

Is Rydberg's constant negative? Or is the equation itself just negative?
by Megan_1F
Fri Oct 18, 2019 11:18 am
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 127
Views: 75139

Re: Reading the textbook [ENDORSED]

I tried reading the textbook but I find that a lot of the material is more detailed than what we were taught in class. Should we base our material off of lecture or the textbook?
by Megan_1F
Sat Oct 12, 2019 12:25 pm
Forum: Properties of Light
Topic: Circular Standing Waves and electrons
Replies: 2
Views: 34

Re: Circular Standing Waves and electrons

Thanks for explaining!
by Megan_1F
Sat Oct 12, 2019 12:24 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 68
Views: 948

Re: Rydberg equation [ENDORSED]

Can someone please tell me which units cancel out when solving the Rydberg equation?
by Megan_1F
Sat Oct 12, 2019 10:58 am
Forum: Properties of Light
Topic: Amplitude
Replies: 12
Views: 84

Re: Amplitude

What is the relationship between amplitude and intensity of light?
by Megan_1F
Sat Oct 12, 2019 10:54 am
Forum: Limiting Reactant Calculations
Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Replies: 66
Views: 949

Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]

When in doubt, survival by partial credit! Probably best to show your work so your TA is following along with you during the problem.
by Megan_1F
Fri Oct 04, 2019 2:53 pm
Forum: Limiting Reactant Calculations
Topic: Calculating Theoretical Yield
Replies: 9
Views: 73

Re: Calculating Theoretical Yield

The limiting reactant will yield how much product is made.
by Megan_1F
Fri Oct 04, 2019 2:50 pm
Forum: Balancing Chemical Reactions
Topic: Strategies for Balancing Chemical Equations
Replies: 12
Views: 62

Re: Strategies for Balancing Chemical Equations

I normally balance the metals first, then the nonmetals (except for H and O), then I balance Hydrogen and Oxygen.
by Megan_1F
Fri Oct 04, 2019 2:44 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Units in Answer
Replies: 18
Views: 121

Re: Units in Answer

Regarding Sig Figs in our final answer, should we be using the amount of sig figs that is given to us in the problem and work our molar mass around that amount of sig figs?
by Megan_1F
Fri Oct 04, 2019 2:42 pm
Forum: SI Units, Unit Conversions
Topic: When are the 5 posts due?
Replies: 6
Views: 42

Re: When are the 5 posts due?

I had the same question as well. Do any of you know if we have to complete the 5 problems for the next section by our next discussion? Or will we have time to learn the material first before having to turn in the homework?
by Megan_1F
Wed Oct 02, 2019 11:11 am
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 139
Views: 83997

Re: Advice from a Medical Student [ENDORSED]

Thanks so much for your advice! I will definitely keep my notes handy as I go through my UCLA journey. Can you tell us a little bit more about your gap year? What types of clubs/ internships/ research opportunities/ etc. you were involved in that helped strengthen your medical school application?

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