Search found 30 matches
- Mon Dec 03, 2018 10:23 am
- Forum: Amphoteric Compounds
- Topic: Examples
- Replies: 6
- Views: 625
Re: Examples
Generally molecules that include metalloids are amphoteric such as silicon and boron.
- Mon Dec 03, 2018 10:20 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligand Names
- Replies: 2
- Views: 290
Re: Ligand Names
I don’t believe you have to remember common ligand names but it would be helpful to review them anyway.
- Mon Dec 03, 2018 9:59 am
- Forum: Naming
- Topic: Naming the Shape
- Replies: 6
- Views: 625
Re: Naming the Shape
The easiest way to determine charge would probably be to just draw the Lewis structure and find the formal charge.
- Mon Dec 03, 2018 12:31 am
- Forum: Naming
- Topic: With Respect to the Final
- Replies: 9
- Views: 983
Re: With Respect to the Final
The homework for that section includes both, so I would practice both.
- Wed Nov 28, 2018 3:11 pm
- Forum: Bond Lengths & Energies
- Topic: 7th Edition 2D.7
- Replies: 1
- Views: 399
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...
- Wed Nov 28, 2018 3:07 pm
- Forum: Dipole Moments
- Topic: Lone pairs when determining hybridization
- Replies: 3
- Views: 334
Re: Lone pairs when determining hybridization
Each set of lone pairs would be considered its own region of electron density.
- Wed Nov 28, 2018 3:06 pm
- Forum: Naming
- Topic: Common Ligand Names
- Replies: 4
- Views: 529
Re: Common Ligand Names
I don't believe you'll have to memorize ligand names, but I would look over them anyway.
- Fri Nov 23, 2018 7:41 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Drawing Structures on Test
- Replies: 11
- Views: 990
Re: Drawing Structures on Test
No, you should be fine just being able to draw the basic lewis structures.
- Fri Nov 23, 2018 7:38 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Models and Resonance Structures
- Replies: 4
- Views: 1043
Re: VSEPR Models and Resonance Structures
No, resonance structures do not effect the determination of lewis structure and vsepr models of molecules.
- Thu Nov 22, 2018 9:32 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent - Lone Pairs
- Replies: 8
- Views: 957
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.
- Fri Nov 16, 2018 7:09 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: sigma bonds
- Replies: 1
- Views: 215
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.
- Fri Nov 16, 2018 7:06 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: AX3E2 Shape
- Replies: 6
- Views: 1231
Re: AX3E2 Shape
A molecule with AX3 atoms and two pairs of free electrons are known as a T-shaped molecule.
- Tue Nov 13, 2018 10:37 pm
- Forum: Electronegativity
- Topic: Electronegativity in Molecules with N,O,F
- Replies: 4
- Views: 1749
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.
- Thu Nov 08, 2018 1:21 pm
- Forum: Bond Lengths & Energies
- Topic: bond lengths and strengths
- Replies: 9
- Views: 942
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.
- Thu Nov 08, 2018 1:19 pm
- Forum: Resonance Structures
- Topic: Finding all Resonance Structures
- Replies: 4
- Views: 514
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.
- Thu Nov 08, 2018 1:17 pm
- Forum: Octet Exceptions
- Topic: Octet
- Replies: 6
- Views: 826
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.
- Mon Nov 05, 2018 9:31 am
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity
- Replies: 3
- Views: 355
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.
- Mon Nov 05, 2018 9:24 am
- Forum: Ionic & Covalent Bonds
- Topic: bond order
- Replies: 2
- Views: 2249
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...
- Mon Nov 05, 2018 9:22 am
- Forum: Lewis Structures
- Topic: Garlic Bread 12a
- Replies: 5
- Views: 567
Re: Garlic Bread 12a
Formal charge should be referenced to see how many bonds should be attached.
- Sat Oct 27, 2018 1:15 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: D-block Question
- Replies: 2
- Views: 235
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.
- Sat Oct 27, 2018 1:13 pm
- Forum: Properties of Electrons
- Topic: Degeneracy
- Replies: 11
- Views: 1250
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.
- Sat Oct 27, 2018 1:08 pm
- Forum: Properties of Light
- Topic: Power calculations
- Replies: 6
- Views: 857
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.
- Sun Oct 21, 2018 1:30 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Lecture Question on Orbitals
- Replies: 4
- Views: 457
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.
- Sun Oct 21, 2018 1:24 pm
- Forum: Photoelectric Effect
- Topic: Oil Drop Experiment
- Replies: 2
- Views: 297
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.
- Sun Oct 21, 2018 1:22 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: 4th quantum number
- Replies: 2
- Views: 311
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.
- Wed Oct 17, 2018 11:09 am
- Forum: Photoelectric Effect
- Topic: SI and equation units
- Replies: 2
- Views: 311
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
- Wed Oct 17, 2018 11:08 am
- Forum: Properties of Light
- Topic: color of light
- Replies: 11
- Views: 1091
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.
- Fri Oct 12, 2018 9:17 am
- Forum: SI Units, Unit Conversions
- Topic: Should Significant Figures be affected by constants?
- Replies: 10
- Views: 986
Re: Should Significant Figures be affected by constants?
Significant figures are not affected by constants that are input.
- Wed Oct 10, 2018 8:13 pm
- Forum: Limiting Reactant Calculations
- Topic: How to determine the limiting reactant???? [ENDORSED]
- Replies: 8
- Views: 12190
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...
- Wed Oct 10, 2018 1:47 pm
- Forum: SI Units, Unit Conversions
- Topic: Rounding Off of 5
- Replies: 7
- Views: 2565
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.