Search found 30 matches

by Peichung Chou 1A
Mon Dec 03, 2018 10:23 am
Forum: Amphoteric Compounds
Topic: Examples
Replies: 6
Views: 101

Re: Examples

Generally molecules that include metalloids are amphoteric such as silicon and boron.
by Peichung Chou 1A
Mon Dec 03, 2018 10:20 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand Names
Replies: 2
Views: 55

Re: Ligand Names

I don’t believe you have to remember common ligand names but it would be helpful to review them anyway.
by Peichung Chou 1A
Mon Dec 03, 2018 9:59 am
Forum: Naming
Topic: Naming the Shape
Replies: 6
Views: 113

Re: Naming the Shape

The easiest way to determine charge would probably be to just draw the Lewis structure and find the formal charge.
by Peichung Chou 1A
Mon Dec 03, 2018 12:31 am
Forum: Naming
Topic: With Respect to the Final
Replies: 9
Views: 172

Re: With Respect to the Final

The homework for that section includes both, so I would practice both.
by Peichung Chou 1A
Wed Nov 28, 2018 3:11 pm
Forum: Bond Lengths & Energies
Topic: 7th Edition 2D.7
Replies: 1
Views: 100

Re: 7th Edition 2D.7

The lone pair of SO2 does affect the bond lengths of the molecule. When there is a lone pair, the electrons of that pair repel the electrons in the atomics in the molecule, and thus push the atoms further than they would be without a lone pair present. Thus, the bond lengths of SO2 are slightly long...
by Peichung Chou 1A
Wed Nov 28, 2018 3:07 pm
Forum: Dipole Moments
Topic: Lone pairs when determining hybridization
Replies: 3
Views: 65

Re: Lone pairs when determining hybridization

Each set of lone pairs would be considered its own region of electron density.
by Peichung Chou 1A
Wed Nov 28, 2018 3:06 pm
Forum: Naming
Topic: Common Ligand Names
Replies: 4
Views: 85

Re: Common Ligand Names

I don't believe you'll have to memorize ligand names, but I would look over them anyway.
by Peichung Chou 1A
Fri Nov 23, 2018 7:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Drawing Structures on Test
Replies: 11
Views: 157

Re: Drawing Structures on Test

No, you should be fine just being able to draw the basic lewis structures.
by Peichung Chou 1A
Fri Nov 23, 2018 7:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Models and Resonance Structures
Replies: 4
Views: 86

Re: VSEPR Models and Resonance Structures

No, resonance structures do not effect the determination of lewis structure and vsepr models of molecules.
by Peichung Chou 1A
Thu Nov 22, 2018 9:32 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent - Lone Pairs
Replies: 8
Views: 194

Re: Bent - Lone Pairs

Yes, the molecular shape for an AX2E and AX2E2 molecule are both bent. However, the electron geometry would be different for both.
by Peichung Chou 1A
Fri Nov 16, 2018 7:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: sigma bonds
Replies: 1
Views: 49

Re: sigma bonds

When two electrons overlap, a sigma bond is created. More sigma bonds generally aren't created as in order to form more bonds, the only possibility is to have electrons side-by-side, which indicates a pi bond.
by Peichung Chou 1A
Fri Nov 16, 2018 7:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: AX3E2 Shape
Replies: 6
Views: 123

Re: AX3E2 Shape

A molecule with AX3 atoms and two pairs of free electrons are known as a T-shaped molecule.
by Peichung Chou 1A
Tue Nov 13, 2018 10:37 pm
Forum: Electronegativity
Topic: Electronegativity in Molecules with N,O,F
Replies: 4
Views: 135

Re: Electronegativity in Molecules with N,O,F

I'm not sure if I'm interpreting your question properly, but I believe NF3 should be able to create a hydrogen bond with hydrogen, because the fluorine molecules are highly electronegative.
by Peichung Chou 1A
Thu Nov 08, 2018 1:21 pm
Forum: Bond Lengths & Energies
Topic: bond lengths and strengths
Replies: 9
Views: 156

Re: bond lengths and strengths

Single bonds are the weakest because the valence electrons with which the bonds are made are at the greatest distance, and so there is less attraction between the nucleus and the electrons. As distance increases, the force of attraction between any two objects decreases.
by Peichung Chou 1A
Thu Nov 08, 2018 1:19 pm
Forum: Resonance Structures
Topic: Finding all Resonance Structures
Replies: 4
Views: 101

Re: Finding all Resonance Structures

You should be able to determine if something is a resonant structure from formal charge tests, as a resonant structure will contain one or more bonds of multiple bond order. However, otherwise there is no trick to determine whether something is a resonant structure.
by Peichung Chou 1A
Thu Nov 08, 2018 1:17 pm
Forum: Octet Exceptions
Topic: Octet
Replies: 6
Views: 131

Re: Octet

All elements that are greater than the atomic number of 20 may have an expanded octet, although the most common exceptions are in the 3p orbital.
by Peichung Chou 1A
Mon Nov 05, 2018 9:31 am
Forum: Trends in The Periodic Table
Topic: Electron Affinity
Replies: 3
Views: 82

Re: Electron Affinity

Electron affinity increases across a period and decreases down a group because of the number of valence electrons, as well as valence electron shielding.
by Peichung Chou 1A
Mon Nov 05, 2018 9:24 am
Forum: Ionic & Covalent Bonds
Topic: bond order
Replies: 2
Views: 74

Re: bond order

The actual formula for bond order we don't need to know yet. Just know the basic ones like triple bonds correspond to a bond order of 3, and a double bond to a bond order of 2, etc...
by Peichung Chou 1A
Mon Nov 05, 2018 9:22 am
Forum: Lewis Structures
Topic: Garlic Bread 12a
Replies: 5
Views: 115

Re: Garlic Bread 12a

Formal charge should be referenced to see how many bonds should be attached.
by Peichung Chou 1A
Sat Oct 27, 2018 1:15 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: D-block Question
Replies: 2
Views: 53

Re: D-block Question

The order of electron configurations is written from lowest energy to highest energy. When occupied, the 3d block is of less energy than the 4s, and so is written before the 4s block. When bonding, the 4s electrons are removed before the 3d.
by Peichung Chou 1A
Sat Oct 27, 2018 1:13 pm
Forum: Properties of Electrons
Topic: Degeneracy
Replies: 11
Views: 367

Re: Degeneracy

Degeneracy indicates that the orbital has the same energy. For instance, 3px and 3py are degenerate orbitals because they have the same amount of energy.
by Peichung Chou 1A
Sat Oct 27, 2018 1:08 pm
Forum: Properties of Light
Topic: Power calculations
Replies: 6
Views: 234

Re: Power calculations

Whenever you do these types of calculations, remember to always use proper parentheses placement. If parentheses are inserted correctly, it will throw off your calculations.
by Peichung Chou 1A
Sun Oct 21, 2018 1:30 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Lecture Question on Orbitals
Replies: 4
Views: 89

Re: Lecture Question on Orbitals

The quantum number m can be seen as in 3 axes, x, y and z. These axes correspond to the m numbers of -1, 0 ,1 used in the example. However, because the order can be flipped as 1,0,-1, professor Lavelle stated that the answer could be x or z.
by Peichung Chou 1A
Sun Oct 21, 2018 1:24 pm
Forum: Photoelectric Effect
Topic: Oil Drop Experiment
Replies: 2
Views: 87

Re: Oil Drop Experiment

The oil-drops were negatively charged through ionization with an x-ray. Thus, they were intentionally charged by the experimenters Millikan and Fletcher.
by Peichung Chou 1A
Sun Oct 21, 2018 1:22 pm
Forum: Quantum Numbers and The H-Atom
Topic: 4th quantum number
Replies: 2
Views: 65

Re: 4th quantum number

Spin is the total angular momentum of an object, described in discrete values based on Planck's constant. Basically, spin is the inert angular momentum of the electron in quantized levels.
by Peichung Chou 1A
Wed Oct 17, 2018 11:09 am
Forum: Photoelectric Effect
Topic: SI and equation units
Replies: 2
Views: 84

Re: SI and equation units

I think the easiest way to do this would be to just remember the SI units that are used in each derived unit. For example, remember that Joules are kg m^2 / s^2
by Peichung Chou 1A
Wed Oct 17, 2018 11:08 am
Forum: Properties of Light
Topic: color of light
Replies: 11
Views: 209

Re: color of light

Considering the equation c = lambda * nu, the color of light is reliant on both wavelength and frequency. Wavelength is the standard to describe what color it is though.
by Peichung Chou 1A
Fri Oct 12, 2018 9:17 am
Forum: SI Units, Unit Conversions
Topic: Should Significant Figures be affected by constants?
Replies: 10
Views: 245

Re: Should Significant Figures be affected by constants?

Significant figures are not affected by constants that are input.
by Peichung Chou 1A
Wed Oct 10, 2018 8:13 pm
Forum: Limiting Reactant Calculations
Topic: How to determine the limiting reactant???? [ENDORSED]
Replies: 8
Views: 925

Re: How to determine the limiting reactant???? [ENDORSED]

The way I think about it is for each molecule you're testing in candidacy for limiting reagent, pretend the other is unlimited in amount. Calculate the molar ratio for the limited molecule with the product and see how much product you get. Do the same with the other molecule, then compare which mole...
by Peichung Chou 1A
Wed Oct 10, 2018 1:47 pm
Forum: SI Units, Unit Conversions
Topic: Rounding Off of 5
Replies: 7
Views: 232

Re: Rounding Off of 5

According to the file professor Lavelle posted on his website, you round up to the next number only if there is a number following the 5 (e.g. 4.56 to 2 sig figs is 4.6). Otherwise you round to the nearest even number.

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