Search found 8 matches

by MattDavid1d
Sun Nov 29, 2015 11:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.19 Predict shape of molecule
Replies: 2
Views: 556

Re: 4.19 Predict shape of molecule

Draw the lewis structure and then determine how many regions of electron density are around the central atom, whether that be in bonds or lone pairs. You can then determine the AXE of the molecule, where X is the number of bonding pairs of electrons and E is the number of bonding pair. The result of...
by MattDavid1d
Sun Nov 29, 2015 6:07 pm
Forum: Limiting Reactant Calculations
Topic: Video: Limiting Reactant
Replies: 1
Views: 264

Video: Limiting Reactant

Hello, attached is a video explaining the concept of limiting reactants
by MattDavid1d
Sat Nov 14, 2015 7:59 pm
Forum: Naming
Topic: Naming of Fe(CO)5
Replies: 2
Views: 199

Naming of Fe(CO)5

When naming the coordinate compound Fe(CO)5, I was surprised to find the name was pentacarbonyliron as opposed to pentacarbonylferrate. Why is this the case?
by MattDavid1d
Mon Nov 02, 2015 12:09 am
Forum: Formal Charge and Oxidation Numbers
Topic: Lewis Dot Structure and Formal Charge
Replies: 3
Views: 490

Re: Lewis Dot Structure and Formal Charge

Both structures are correct resonance structure, and the one with the triple bond is the preferred one because it is more stable. This is because Oxygen is more electronegative than nitrogen, and also because triple bonds are intrinsically more stable than double bonds.
by MattDavid1d
Mon Oct 26, 2015 7:44 pm
Forum: Octet Exceptions
Topic: Octet exceptions
Replies: 2
Views: 344

Re: Octet exceptions

Only elements that have access to the d-orbital electrons are able to have expanded octets
by MattDavid1d
Sat Oct 17, 2015 10:16 pm
Forum: Dipole Moments
Topic: Dipole Moment Arrows
Replies: 5
Views: 944

Re: Dipole Moment Arrows

As far as I am aware, both ways are essentially the same with merely a reversal in sign. How it begins/last which way the arrow points is arbitrary as long as you remain consistent with that direction throughout the entirety of the problem.
by MattDavid1d
Sat Oct 17, 2015 10:08 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Aufbau Princple
Replies: 2
Views: 292

Re: Aufbau Princple

A half filled subshell in the d orbital is more stable than if there was a 6th electron. Additionally having a half filled d orbital provides more stability than a full s orbital and a d-orbital that is not full or half filled.
by MattDavid1d
Mon Oct 05, 2015 12:50 am
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 90
Views: 7736

Re: All students read this sig fig post [ENDORSED]

I believe that when you are working with constants that are exact (or approximated down to specific number like 3 x 10^8m*s^-1) they are not counted when determining the number of significant figures. Contrarily, when the constants are not exact you should aim to have a larger quantity of significan...

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