Search found 30 matches

by Tiffany Dong_4e
Mon Nov 11, 2019 10:34 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: london forces
Replies: 6
Views: 13

Re: london forces

Yes, all molecules have london dispersion forces. However, the more electrons a molecule has, the stronger the forces are.
by Tiffany Dong_4e
Mon Nov 11, 2019 10:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: central atoms
Replies: 7
Views: 22

Re: central atoms

The central atom is typically determined by whichever atom has the lowest electronegativity. Aside from this, the atom which is alone or has the lowest quantity is usually in the center.
by Tiffany Dong_4e
Mon Nov 11, 2019 10:24 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge
Replies: 16
Views: 48

Re: Formal charge

Getting close to 0 is ideal, but the "next best" option would be giving a more electronegative atom like oxygen a negative charge.
by Tiffany Dong_4e
Mon Nov 11, 2019 10:23 pm
Forum: Lewis Structures
Topic: Test Questions regarding Electronegativity
Replies: 1
Views: 8

Re: Test Questions regarding Electronegativity

I believe so because we used a chart to determine electronegativity difference in lecture. Generally, anything we need should be provided for us on the test.
by Tiffany Dong_4e
Mon Nov 11, 2019 10:21 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing Power
Replies: 6
Views: 22

Re: Polarizing Power

A cation's ability to distort an anion's electron cloud is polarizing power. Polarizability is the tendency of a cation to be affected by an anion's polarizing power.
by Tiffany Dong_4e
Sun Nov 03, 2019 8:39 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 4s or 3d first?
Replies: 14
Views: 63

Re: 4s or 3d first?

Lavelle wants us to write 3d before 4s, but I in general it isn't incorrect to write 4s before 3d. I think you should maintain class expectations for the test though.
by Tiffany Dong_4e
Sun Nov 03, 2019 8:36 pm
Forum: *Black Body Radiation
Topic: Info for Midterm
Replies: 7
Views: 69

Re: Info for Midterm

He mentioned this briefly, but stated it will not be tested in this class.
by Tiffany Dong_4e
Sun Nov 03, 2019 8:32 pm
Forum: Resonance Structures
Topic: Do we always need to draw resonance?
Replies: 1
Views: 13

Do we always need to draw resonance?

If a molecule has resonance structures, but they are not explicitly asked for in the problem, do we still need to draw them?
by Tiffany Dong_4e
Sun Nov 03, 2019 8:31 pm
Forum: Resonance Structures
Topic: Resonance Structures
Replies: 1
Views: 10

Resonance Structures

How do we determine if a molecule has resonance structures?
by Tiffany Dong_4e
Sun Nov 03, 2019 8:13 pm
Forum: Octet Exceptions
Topic: Elements with Exceptions to Octet Rule
Replies: 1
Views: 15

Elements with Exceptions to Octet Rule

Which elements have exceptions to the octet rule? i.e. Phosphorous which can have an expanded octet or Boron which doesn't need a full octet
by Tiffany Dong_4e
Sun Oct 27, 2019 8:57 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Bonds
Replies: 14
Views: 45

Re: Covalent Bonds

Yes, it's only between nonmetals. If other metals were involved, it would probably be a different type of bond.
by Tiffany Dong_4e
Sun Oct 27, 2019 8:47 pm
Forum: Resonance Structures
Topic: Resonance Structures
Replies: 3
Views: 27

Re: Resonance Structures

Resonant structures allow for greater accuracy when modeling certain molecules because they show us that those molecules have delocalized electrons which can move around. You don't "need" to move the bond, but it is good to know that the bond can move.
by Tiffany Dong_4e
Sun Oct 27, 2019 8:40 pm
Forum: Bond Lengths & Energies
Topic: bond lengths for single or double bonds
Replies: 7
Views: 18

Re: bond lengths for single or double bonds

The stronger the bond, the shorter the bond length, so double bonds will be shorter than single bonds.
by Tiffany Dong_4e
Sun Oct 27, 2019 6:03 pm
Forum: Properties of Electrons
Topic: Determining Number of Valence Electrons
Replies: 2
Views: 18

Determining Number of Valence Electrons

Are we expected to know the number of valence electrons in transition metals? It was a homework problem, so I wanted to make sure. The problem stated to identify the number of valence electrons (including d electrons) in magnesium. If we are expected to know this, how would we determine the number?
by Tiffany Dong_4e
Sun Oct 27, 2019 1:26 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration Special Cases
Replies: 6
Views: 31

Electron Configuration Special Cases

Aside from chromium and copper, are there any other elements that have "exceptions" in electron configuration?
by Tiffany Dong_4e
Mon Oct 21, 2019 2:27 am
Forum: Trends in The Periodic Table
Topic: Difference between electron affinity and electronegativity?
Replies: 3
Views: 19

Re: Difference between electron affinity and electronegativity?

Electron affinity is the likelihood of an atom gaining an electron, while electronegativity is the tendency of an atom to attract electrons.
by Tiffany Dong_4e
Mon Oct 21, 2019 2:04 am
Forum: Photoelectric Effect
Topic: Threshold Energy
Replies: 7
Views: 42

Re: Threshold Energy

I'm also confused how an electron is "ejected" with no kinetic energy. Could someone clarify further?
by Tiffany Dong_4e
Mon Oct 21, 2019 1:15 am
Forum: Properties of Light
Topic: Balmer and Lyman Series
Replies: 5
Views: 32

Re: Balmer and Lyman Series

The electron moving from n1 to n2 is the process of it being excited. The Lyman and Balmer series describe the electron as it is falling back down to lower energy levels from its excited state.
by Tiffany Dong_4e
Mon Oct 21, 2019 12:55 am
Forum: Administrative Questions and Class Announcements
Topic: Periodic Table on the Test
Replies: 7
Views: 51

Re: Periodic Table on the Test

You're provided a periodic table, along with an equation sheet, so I believe you should use those so that your answers will be more accurate. (:
by Tiffany Dong_4e
Mon Oct 21, 2019 12:42 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: What's the right equation?
Replies: 7
Views: 41

Re: What's the right equation?

If you're referring to the Heisenberg Uncertainty Equation, it should be the first one.
by Tiffany Dong_4e
Mon Oct 14, 2019 9:22 am
Forum: Properties of Light
Topic: Wave Frequency
Replies: 9
Views: 40

Re: Wave Frequency

I also believe it is the amount of energy per photon because photons are essentially discrete packets of energy in the form of waves.
by Tiffany Dong_4e
Mon Oct 14, 2019 9:12 am
Forum: Properties of Light
Topic: Quantum Levels
Replies: 1
Views: 16

Re: Quantum Levels

If you're asking whether or not a quanta can have a value other than a whole number then this is not possible. They can, however, have values that continue to infinity as long as they're whole.
by Tiffany Dong_4e
Mon Oct 14, 2019 8:44 am
Forum: Properties of Light
Topic: Memorizing Values for Tests
Replies: 3
Views: 9

Re: Memorizing Values for Tests

The values will be provided for you on the formula sheet, so you don't have to memorize them. However, I would try to memorize ones that reoccur often like Planck's constant.
by Tiffany Dong_4e
Mon Oct 14, 2019 8:34 am
Forum: Student Social/Study Group
Topic: Best Sessions
Replies: 12
Views: 49

Re: Best Sessions

The step-up sessions help me a lot because they go at a slower pace. In workshops, you're expected to know the material.
by Tiffany Dong_4e
Sun Oct 06, 2019 11:56 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Theoretical vs. Actual Yield
Replies: 38
Views: 258

Re: Theoretical vs. Actual Yield

The actual yield is generally not equal to the theoretical yield because of impurities during experimentation or other factors such as solution staying on the sides of the beaker. In order for the actual yield to equal the theoretical yield, the experiment would need to be executed perfectly.
by Tiffany Dong_4e
Sun Oct 06, 2019 11:49 pm
Forum: Balancing Chemical Reactions
Topic: Naming/Polyatomic ions
Replies: 4
Views: 29

Re: Naming/Polyatomic ions

I was told by my TA that it would definitely be useful to memorize the polyatomic ions, but I don't think they'll be particularly relevant to the test.
by Tiffany Dong_4e
Sun Oct 06, 2019 11:46 pm
Forum: Limiting Reactant Calculations
Topic: Question about Calculating Limiting Reactants
Replies: 5
Views: 37

Question about Calculating Limiting Reactants

Are you allowed to simply calculate the moles of each reactant and then compare them to find the limiting reagent?
by Tiffany Dong_4e
Sun Oct 06, 2019 3:18 pm
Forum: Significant Figures
Topic: Inaccurate Answer
Replies: 1
Views: 31

Inaccurate Answer

I don't know what my problem is, but I seem to always be slightly off the answer. Could I get some advice? For example, I'll calculate the molar mass of C6H12O6 and get 180.14 g/mol rather than 180.15 g/mol like the book says. The way I've been doing it is I keep the values of the atomic masses the ...
by Tiffany Dong_4e
Sat Oct 05, 2019 6:15 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Atoms, Molecules, and Formula Units
Replies: 4
Views: 52

Atoms, Molecules, and Formula Units

How is it possible that Avogadro's Constant can be used to find atoms, molecules, and formula units? Does whichever item you're finding depend on the substance involved in the problem?
by Tiffany Dong_4e
Fri Oct 04, 2019 12:40 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 61
Views: 18355

Re: Final Jitters

I think many people experience test anxiety and that's okay! I usually cope by doing something I enjoy before a test such as playing piano or reading a book. I'm still a first year though so my experience is also limited. I think the best strategy is to simply be prepared. If you feel ready, that sh...

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