Search found 37 matches

by Rylee Nelsen 3A
Sat Dec 01, 2018 3:05 pm
Forum: Naming
Topic: New IUPAC Name Convention - coordinate compounds
Replies: 1
Views: 31

New IUPAC Name Convention - coordinate compounds

In the chart that Professor Lavelle posted on the class website it has the New IUPAC Name Convention, are we going to need to know those for the final?
by Rylee Nelsen 3A
Sat Dec 01, 2018 2:48 pm
Forum: Naming
Topic: Ligand
Replies: 4
Views: 80

Re: Ligand

Yes we are supposed to know the names of ligands, here is a link to a quizlet thank could be helpful: https://quizlet.com/_5pyzad
by Rylee Nelsen 3A
Sat Dec 01, 2018 2:41 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: oxidation numbers for ligands
Replies: 2
Views: 52

oxidation numbers for ligands

I am confused as to how you calculate the oxidation number for ligands in a coordinate compound? If someone could give an example that would be greatly appreciated!
by Rylee Nelsen 3A
Sat Dec 01, 2018 2:39 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam
Replies: 22
Views: 474

Re: Final Exam

It is cumulative and in lecture, Professor Lavelle said that each unit will be equally on the final! It is only 8 questions so basically 1 or 2 questions per concept.
by Rylee Nelsen 3A
Sat Dec 01, 2018 2:38 pm
Forum: Lewis Acids & Bases
Topic: lewis acid and bases
Replies: 3
Views: 73

lewis acid and bases

Does the structure of an atom have anything to do with whether it is a lewis acid or base?
by Rylee Nelsen 3A
Mon Nov 26, 2018 1:07 pm
Forum: Hybridization
Topic: Hybridization
Replies: 2
Views: 42

Hybridization

Are we going to have to draw out the hybridization of an atom for the test?
by Rylee Nelsen 3A
Mon Nov 26, 2018 1:06 pm
Forum: Hybridization
Topic: When to hybridized?
Replies: 6
Views: 73

Re: When to hybridized?

You can find the hybridization of an atom by finding the number of bonding regions plus the number of lone pairs around the central atom (steric number). If the steric number is 4, the atom is s p 3 hybridized. If the steric number is 3, the atom is s p 2 hybridized.
by Rylee Nelsen 3A
Sat Nov 24, 2018 3:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angles
Replies: 2
Views: 33

Bond angles

I am confused as to how you determine whether an angle is less than 109.5 degrees? Could someone give me an example?
by Rylee Nelsen 3A
Sat Nov 24, 2018 11:56 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent - Lone Pairs
Replies: 8
Views: 194

Re: Bent - Lone Pairs

Yes, the molecular geometry for both would be bent. However, they would have different electron geometries.
by Rylee Nelsen 3A
Sat Nov 24, 2018 11:55 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Does formal charge apply to the VSEPR Model?
Replies: 6
Views: 95

Re: Does formal charge apply to the VSEPR Model?

Yes, when you use the vsepr model you need to be using the most stable Lewis structure to determine the number of lone pairs. So, you need to find the formal charges for the atoms in order determine the electron geometry.
by Rylee Nelsen 3A
Sat Nov 24, 2018 11:53 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 7
Views: 102

Re: Polarity

Dipole moments only occur in polar molecules when there is a difference in electronegativity. If you draw the arrows on the Lewis structure there will be a dipole moment when the arrows do not cancel out, meaning they are not pointing is opposite directions basically.
by Rylee Nelsen 3A
Sat Nov 24, 2018 11:51 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond length
Replies: 2
Views: 50

Bond length

Will we have to do actual calculations to determine bond length?
by Rylee Nelsen 3A
Sat Nov 24, 2018 11:50 am
Forum: Determining Molecular Shape (VSEPR)
Topic: vsepr model
Replies: 3
Views: 68

vsepr model

Can someone explain to me the difference between the electron geometry and the molecular geometry for the VSEPR model?
by Rylee Nelsen 3A
Sat Nov 24, 2018 11:44 am
Forum: Determining Molecular Shape (VSEPR)
Topic: vsepr shape
Replies: 6
Views: 98

Re: vsepr shape

I made a chart for the VSEPR model that shows each lewis structure and the particular shape, angle and # of lone pairs that it corresponds to. I would just memorize some of them, it makes it easier to identify atoms.
by Rylee Nelsen 3A
Fri Nov 16, 2018 9:36 am
Forum: Electronegativity
Topic: Electronegativity
Replies: 8
Views: 231

Re: Electronegativity

In the periodic table electronegativity generally follows the trend of increasing left to right. However, this trend does not include the noble gases and fluorine has the highest electronegativity instead of Ne or He.
by Rylee Nelsen 3A
Fri Nov 16, 2018 9:28 am
Forum: Octet Exceptions
Topic: Octet vs formal charge
Replies: 16
Views: 412

Re: Octet vs formal charge

I would say that finding the lowest possible formal charge to create the most stable Lewis structure is more important because there are various exceptions to the octet rule so you cannot always base where a structure is correct if each atom has a full octet.
by Rylee Nelsen 3A
Fri Nov 16, 2018 9:26 am
Forum: Dipole Moments
Topic: Induced-dipole
Replies: 5
Views: 122

Re: Induced-dipole

An induced dipole is an attraction that occurs when a polar molecule induces a dipole in an atom or in a nonpolar molecule by changing the arrangement of electrons in the nonpolar species. For example, with HCl and Argon, the electrons on an argon atom are distributed around the nucleus of the atom....
by Rylee Nelsen 3A
Tue Nov 13, 2018 1:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining VSEPR bond angles
Replies: 5
Views: 89

Re: Determining VSEPR bond angles

For the SOCl2 the oxygen atom and two chlorine atoms are both singularly bonded to sulfur. Also, sulfur has a lone pair. So, because there are four regions of electron density with one lone pair, then the shape would be trigonal pyramidal. In part b, all of the OSCL angles would be the same because ...
by Rylee Nelsen 3A
Mon Nov 12, 2018 2:22 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Cations and polarizing power
Replies: 3
Views: 48

Re: Cations and polarizing power

What I have gathered is that the smaller the size of a the cation the greater its polarizing power and the greater the covalent bond will be. So, as the charge on the ion increases, the electrostatic attraction of the cation for the outer electrons of the anion also increases and then it will be abl...
by Rylee Nelsen 3A
Mon Nov 12, 2018 2:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 4
Views: 69

Re: Bond Angles

Yes, the angles depend on the structure of the molecule so for example Trigonal Planar has 0 lone pairs and is 120 degrees, Tetrahedral also has zero lone pairs and is 109.5 degrees and a T - shape has 2 lone pairs and is 90 degrees. Hope this helps!
by Rylee Nelsen 3A
Mon Nov 12, 2018 10:17 am
Forum: Administrative Questions and Class Announcements
Topic: Test 3 dates?
Replies: 11
Views: 309

Re: Test 3 dates?

Test 3 starts on November 27th in discussion sections so it doesn't affect Thanksgiving break.
by Rylee Nelsen 3A
Mon Nov 12, 2018 10:15 am
Forum: SI Units, Unit Conversions
Topic: Kiloelectron volt to Joule
Replies: 5
Views: 326

Re: Kiloelectron volt to Joule

The conversion factor is 1.602 x 10^19 joule = 1 electron volt.
by Rylee Nelsen 3A
Mon Nov 12, 2018 10:14 am
Forum: Ionic & Covalent Bonds
Topic: Polarizability vs Polarizing Power
Replies: 2
Views: 64

Re: Polarizability vs Polarizing Power

Polarizability is the ability for a molecule to be polarized (have its electron cloud distorted by the pull of the smaller atom, and it increases as the volume occupied by electrons increases. Whereas polarization power is the ability of a cation to distort an anion. If the degree of polarization is...
by Rylee Nelsen 3A
Mon Nov 12, 2018 12:12 am
Forum: Ionic & Covalent Bonds
Topic: Covalent bond dissociation energy
Replies: 1
Views: 68

Re: Covalent bond dissociation energy

Lone pair electrons are related to the strengths of bonds because electrons naturally repel each other, when they’re located on neighboring atoms they will create a repulsion that weakens the bond. So, as the number of lone pairs on neighboring atoms increases, the dissociation energy decreases.
by Rylee Nelsen 3A
Mon Nov 12, 2018 12:06 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Calculating Dissociation Energy
Replies: 3
Views: 64

Re: Calculating Dissociation Energy

Bond dissociation energy is similar to Bond energy, as both are different terms. Bond dissociation energy one is the measure of the strength of the bond where as bond energy is the total energy contained in a chemical bond.
by Rylee Nelsen 3A
Sun Nov 11, 2018 11:59 pm
Forum: Dipole Moments
Topic: Hydrogen Bonds
Replies: 20
Views: 248

Re: Hydrogen Bonds

It's a type of weak chemical bond that occurs when the partially positive hydrogen atom participating in a polar covalent bond in a molecule attracts partially negative atom or atoms of neighboring molecules.
by Rylee Nelsen 3A
Sun Nov 11, 2018 5:01 pm
Forum: Lewis Structures
Topic: Formal charges
Replies: 15
Views: 199

Re: Formal charges

If they are asking for the most stable Lewis structure then the formal charges are necessary but just to be safe I would put them.
by Rylee Nelsen 3A
Sun Nov 11, 2018 4:59 pm
Forum: Lewis Structures
Topic: Lewis Structure
Replies: 10
Views: 166

Re: Lewis Structure

You have to make sure that the elements symmetrically spaced, that the element with the lowest ionization energy is in the middle and that the formal charges are the lowest to make the most stable structure.
by Rylee Nelsen 3A
Sun Nov 11, 2018 4:46 pm
Forum: Octet Exceptions
Topic: Number of electrons in relation to Octet
Replies: 3
Views: 55

Re: Number of electrons in relation to Octet

There are many elements that are exceptions to the octect rule, like all of the third period elements can have expanded octets like CL and Br. The octect rule also doesn’t apply when there are odd valence electrons but the elements cannot share electrons between each other.
by Rylee Nelsen 3A
Sat Nov 03, 2018 6:51 pm
Forum: Quantum Numbers and The H-Atom
Topic: Degeneracy
Replies: 8
Views: 346

Re: Degeneracy

Degenerate orbitals have the same energy levels. The degeneracy of orbitals is basically when they have the same values of n but different values of l. Hope this helps!
by Rylee Nelsen 3A
Sat Nov 03, 2018 6:44 pm
Forum: Lewis Structures
Topic: Lewis Acids and Bases
Replies: 5
Views: 68

Re: Lewis Acids and Bases

Lewis Acids are electron pair acceptor and bases are electron pair donors.
by Rylee Nelsen 3A
Sat Nov 03, 2018 6:40 pm
Forum: Trends in The Periodic Table
Topic: Effective Nuclear Charge
Replies: 5
Views: 118

Re: Effective Nuclear Charge

Effective nuclear charge increases across the period and decreases going down a group.
by Rylee Nelsen 3A
Sun Oct 21, 2018 2:46 pm
Forum: Photoelectric Effect
Topic: Kinetic energy
Replies: 4
Views: 77

Kinetic energy

Will the work function always be given to us when solving a problem are will there be a scenario where we will have to find it ourselves?
by Rylee Nelsen 3A
Thu Oct 11, 2018 11:25 am
Forum: Limiting Reactant Calculations
Topic: How to determine the limiting reactant???? [ENDORSED]
Replies: 8
Views: 926

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

If you're having trouble, I would recommend watching this video https://www.youtube.com/watch?v=Mlu_v8rE1TY. It explains the process very clearly, and lets you see the organization of a limiting reactant problem! Hope that helps!
by Rylee Nelsen 3A
Wed Oct 10, 2018 8:39 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Meaning of Quanta/Quantized
Replies: 2
Views: 63

Re: Meaning of Quanta/Quantized

I am pretty sure that an electron is quantized when electrons are emitted from a metal's surface when light of a certain frequency shines on it, releasing a photon.
by Rylee Nelsen 3A
Wed Oct 10, 2018 8:34 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Threshold Energy
Replies: 4
Views: 51

Re: Threshold Energy

The threshold energy is basically the minimum kinetic energy required to remove an electron. Also, the energy of photoelectrons emitted when light hits a metal depends on the frequency. When light with the right frequency is shone onto a metal surface, electrons are emitted from the surface.

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