Search found 30 matches

by Aaron Ang 4H
Fri Dec 07, 2018 12:22 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: Induced dipole-induced dipole
Replies: 1
Views: 97

Re: Induced dipole-induced dipole

London dispersion forces, also known as induced dipole-dipole forces are temporary forces that from between all molecules. They occur randomly and constantly occur when the electrons in molecules are distorted creating temporary positive and negative charges which attract but go away once electrons ...
by Aaron Ang 4H
Fri Dec 07, 2018 12:17 am
Forum: Naming
Topic: Naming of compounds with multiple ligands
Replies: 1
Views: 64

Naming of compounds with multiple ligands

I get that ligands are put in order when naming a compound but why is that it is different in the chemical formula? An example of this is [FeCl(OH2)5]+ and the name is pentaaquachloridoiron(II) and i get that but why is chlorine in front of the water in the formula?
by Aaron Ang 4H
Fri Dec 07, 2018 12:01 am
Forum: Electronegativity
Topic: Electronegativity vs ionization energy
Replies: 7
Views: 269

Re: Electronegativity vs ionization energy

Electronegativity is the tendency of an atom to gain an electron while its ionization energy its tendency/ energy required to lose its electron
by Aaron Ang 4H
Wed Nov 28, 2018 8:18 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electron Geometry and Molecular Geometry
Replies: 2
Views: 99

Re: Electron Geometry and Molecular Geometry

I would just have both on the paper just to be safe but for the final answer, definitely go with the molecular geometry
by Aaron Ang 4H
Wed Nov 28, 2018 8:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular orientation
Replies: 2
Views: 73

Re: Molecular orientation

The rule for the sequence of elements in a chemical formula is Carbon, Hydrogen, other elements in alphabetical order and if there is no carbon or hydrogen, then it is just elements in alphabetical order
by Aaron Ang 4H
Wed Nov 28, 2018 7:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz
Replies: 1
Views: 108

Re: Quiz

Everything is posted on Dr. Lavelle's website. For quiz 3, it will be on the end of bonding and all of molecular shape and structure
by Aaron Ang 4H
Wed Nov 28, 2018 7:40 pm
Forum: Hybridization
Topic: Sp3d or dsp3
Replies: 4
Views: 157

Re: Sp3d or dsp3

I dont think it matters. Both ways of writing the hybridization orbital works
by Aaron Ang 4H
Wed Nov 28, 2018 7:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: N2O Lewis Structure
Replies: 2
Views: 82

Re: N2O Lewis Structure

O cannot be the central atom because since both oxygen and nitrogen are in period 2, they must follow the octet rule. Furthermore, nitrogen needs to have 3 bonds therefore, having oxygen as the central atom would be impossible due to the amount of electrons available and due to formal charge
by Aaron Ang 4H
Wed Nov 28, 2018 11:25 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VESPR Theory
Replies: 1
Views: 61

VESPR Theory

Can someone please explain how to predict the position of lone pairs when determining a molecule's molecular shape?
by Aaron Ang 4H
Mon Nov 19, 2018 12:03 am
Forum: Dipole Moments
Topic: London Force Times
Replies: 3
Views: 106

Re: London Force Times

To my knowledge, there is no actual average time that London dispersion forces will act upon two molecules for. The are temporary bonds that are constantly forming and constantly breaking.
by Aaron Ang 4H
Sun Nov 18, 2018 11:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VESPR Theory
Replies: 3
Views: 182

VESPR Theory

How can the VESPR theory be used to predict the shape of the molecule?
by Aaron Ang 4H
Sun Nov 18, 2018 11:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: vsper structures
Replies: 3
Views: 86

Re: vsper structures

When the electron is in the axial plane, it is vertical plane through the middle of the central atom while electrons on the equatorial plane are in the horizontal plane through the middle of the central atom
by Aaron Ang 4H
Fri Nov 09, 2018 1:25 am
Forum: Dipole Moments
Topic: London Forces
Replies: 2
Views: 96

Re: London Forces

London dispersion forces are created when electrons from two separate atoms/molecules move around and occupy positions that make the atoms form temporary dipoles which which causes a temporary attractive force. Therefore, London dispersion forces exist because all elements have electrons and will fo...
by Aaron Ang 4H
Fri Nov 09, 2018 1:09 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: Liquid and Solid Formation
Replies: 2
Views: 106

Re: Liquid and Solid Formation

Molecules in a liquid form are more spread out than molecules in a solid form therefore the intermolecular forces in between them are weaker in the liquid form as opposed to the solid form. To answer your second question, CCl4 has a higher boiling point than CH4 because it has more electrons and the...
by Aaron Ang 4H
Fri Nov 09, 2018 12:58 am
Forum: Ionic & Covalent Bonds
Topic: Bond strength and state of matter
Replies: 2
Views: 85

Re: Bond strength and state of matter

Yes, there is a relationship between state of matter and bond length. Those in the gas state have the weakest bonds which is then followed by compounds in the liquid state which is weaker than compounds in the solid form.
by Aaron Ang 4H
Thu Nov 01, 2018 3:16 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: S and d orbitals order in configuration
Replies: 2
Views: 100

Re: S and d orbitals order in configuration

For all n values under 4, you could just fill them based on increasing n values and in the order of s-orbitals first and then p-orbitals. However, starting with an n value of 4, you would fill orbitals starting with the s-orbital followed by the d- orbital and then the p-orbital. However, when writi...
by Aaron Ang 4H
Thu Nov 01, 2018 2:37 pm
Forum: Trends in The Periodic Table
Topic: Trends in first ionization energies
Replies: 3
Views: 79

Re: Trends in first ionization energies

First Ionization energies typically decrease down a group and increase across a period (from left to right)
by Aaron Ang 4H
Thu Nov 01, 2018 2:27 pm
Forum: Trends in The Periodic Table
Topic: Why is ionization energy of oxygen lower than nitrogen?
Replies: 2
Views: 1766

Re: Why is ionization energy of oxygen lower than nitrogen?

Nitrogen has a lower ionization energy than oxygen because nitrogen is half filled which according the Hund's rule, half filled and full filled orbitals are more stable.
by Aaron Ang 4H
Fri Oct 26, 2018 11:12 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Isoelectronic Molecules
Replies: 2
Views: 68

Re: Isoelectronic Molecules

Another example of isoelectronic Molecules is Cl+, Ar, and K-
by Aaron Ang 4H
Fri Oct 26, 2018 11:07 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Affinity [ENDORSED]
Replies: 7
Views: 194

Re: Electron Affinity [ENDORSED]

Electron affinity decreases down a group and increases across a period
by Aaron Ang 4H
Fri Oct 26, 2018 11:04 am
Forum: Trends in The Periodic Table
Topic: Electron Affinity
Replies: 8
Views: 147

Re: Electron Affinity

Also, another trend for electron affinity can be seen when you go diagonally from the bottom left to the top right of the periodic table. Chlorine has the greatest electron affinity.
by Aaron Ang 4H
Fri Oct 19, 2018 11:37 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: d- orbitals
Replies: 2
Views: 103

Re: d- orbitals

From what I recall from lecture today, we will only be asked questions with the px, py, and pz orbitals. We will not have to know dxy, dyz, dzx or any of the f orbitals
by Aaron Ang 4H
Fri Oct 19, 2018 11:31 am
Forum: DeBroglie Equation
Topic: Rest Mass v. Movement
Replies: 2
Views: 89

Re: Rest Mass v. Movement

It depends on the object that is moving. According to Einstein's theory of special relativity, if the object with no rest mass is traveling closer to the speed of light, the mass increases. As an object approaches the speed of light, its mass approaches infinity as well
by Aaron Ang 4H
Fri Oct 19, 2018 12:47 am
Forum: DeBroglie Equation
Topic: Rest Mass
Replies: 7
Views: 195

Re: Rest Mass

No not everything has rest mass. For example, you could not use De Broglie's equation to solve for the wavelength of light because it is massless. You could only use this equation for anything that has a mass.
by Aaron Ang 4H
Fri Oct 12, 2018 11:48 am
Forum: Empirical & Molecular Formulas
Topic: Empirical & Molecular Formulas
Replies: 11
Views: 712

Re: Empirical & Molecular Formulas

Yes, the empirical and molecular formula can be the same depending on the molar weight provided by the question. For example, if your empirical formula was H2O and the molar weight provided was 18.02, then the molecular formula would also be H2O.
by Aaron Ang 4H
Fri Oct 12, 2018 11:36 am
Forum: Empirical & Molecular Formulas
Topic: Order of Molecules
Replies: 4
Views: 280

Re: Order of Molecules

In order to write a chemical formula, you start off by listing the carbon atoms followed by the hydrogen atoms and then alphabetical order.
by Aaron Ang 4H
Fri Oct 12, 2018 11:30 am
Forum: Photoelectric Effect
Topic: Confusion on Photoelectric Effect
Replies: 2
Views: 85

Re: Confusion on Photoelectric Effect

The photoelectric experiment shines light on a metal surface to measure energy needed to remove electrons from different metals. As the light is shined on the metal, the energy generated is conserved thus the threshold energy is equal to the energy of the electron that is deflected. Therefore, E=hv ...
by Aaron Ang 4H
Fri Oct 05, 2018 1:10 pm
Forum: Balancing Chemical Reactions
Topic: How To....
Replies: 16
Views: 687

Re: How To....

The question about adding the state of matter to a chemical equation was brought up in my discussion today and the TA said that the questions asked on the tests should be pretty self explanatory in this regard and that we would definitely be able to infer the state of matter. As for balancing a chem...
by Aaron Ang 4H
Fri Oct 05, 2018 1:00 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Avogadro's Number
Replies: 9
Views: 246

Re: Avogadro's Number

you would use avagadro's number for both molecules and atoms
by Aaron Ang 4H
Thu Oct 04, 2018 7:40 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E. 15 (7th Edition)
Replies: 2
Views: 68

Re: E. 15 (7th Edition)

First figure out what the metal is based on its molar mass and then find the molar mass of the metal sulfide.

Go to advanced search