Search found 30 matches
- 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: 299
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 ...
- Fri Dec 07, 2018 12:17 am
- Forum: Naming
- Topic: Naming of compounds with multiple ligands
- Replies: 1
- Views: 285
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?
- Fri Dec 07, 2018 12:01 am
- Forum: Electronegativity
- Topic: Electronegativity vs ionization energy
- Replies: 7
- Views: 1007
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
- Wed Nov 28, 2018 8:18 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Electron Geometry and Molecular Geometry
- Replies: 2
- Views: 408
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
- Wed Nov 28, 2018 8:15 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular orientation
- Replies: 2
- Views: 293
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
- Wed Nov 28, 2018 7:51 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz
- Replies: 1
- Views: 281
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
- Wed Nov 28, 2018 7:40 pm
- Forum: Hybridization
- Topic: Sp3d or dsp3
- Replies: 22
- Views: 2224
Re: Sp3d or dsp3
I dont think it matters. Both ways of writing the hybridization orbital works
- Wed Nov 28, 2018 7:38 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: N2O Lewis Structure
- Replies: 2
- Views: 535
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
- Wed Nov 28, 2018 11:25 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VESPR Theory
- Replies: 1
- Views: 226
VESPR Theory
Can someone please explain how to predict the position of lone pairs when determining a molecule's molecular shape?
- Mon Nov 19, 2018 12:03 am
- Forum: Dipole Moments
- Topic: London Force Times
- Replies: 3
- Views: 395
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.
- Sun Nov 18, 2018 11:46 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VESPR Theory
- Replies: 3
- Views: 917
VESPR Theory
How can the VESPR theory be used to predict the shape of the molecule?
- Sun Nov 18, 2018 11:41 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: vsper structures
- Replies: 3
- Views: 428
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
- Fri Nov 09, 2018 1:25 am
- Forum: Dipole Moments
- Topic: London Forces
- Replies: 2
- Views: 307
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...
- 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: 373
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...
- Fri Nov 09, 2018 12:58 am
- Forum: Ionic & Covalent Bonds
- Topic: Bond strength and state of matter
- Replies: 2
- Views: 576
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.
- 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: 366
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...
- Thu Nov 01, 2018 2:37 pm
- Forum: Trends in The Periodic Table
- Topic: Trends in first ionization energies
- Replies: 3
- Views: 341
Re: Trends in first ionization energies
First Ionization energies typically decrease down a group and increase across a period (from left to right)
- 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: 43311
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.
- Fri Oct 26, 2018 11:12 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Isoelectronic Molecules
- Replies: 2
- Views: 315
Re: Isoelectronic Molecules
Another example of isoelectronic Molecules is Cl+, Ar, and K-
- Fri Oct 26, 2018 11:07 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Affinity [ENDORSED]
- Replies: 7
- Views: 769
Re: Electron Affinity [ENDORSED]
Electron affinity decreases down a group and increases across a period
- Fri Oct 26, 2018 11:04 am
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity
- Replies: 8
- Views: 733
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.
- Fri Oct 19, 2018 11:37 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: d- orbitals
- Replies: 2
- Views: 349
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
- Fri Oct 19, 2018 11:31 am
- Forum: DeBroglie Equation
- Topic: Rest Mass v. Movement
- Replies: 2
- Views: 328
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
- Fri Oct 19, 2018 12:47 am
- Forum: DeBroglie Equation
- Topic: Rest Mass
- Replies: 7
- Views: 713
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.
- Fri Oct 12, 2018 11:48 am
- Forum: Empirical & Molecular Formulas
- Topic: Empirical & Molecular Formulas
- Replies: 11
- Views: 1569
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.
- Fri Oct 12, 2018 11:36 am
- Forum: Empirical & Molecular Formulas
- Topic: Order of Molecules
- Replies: 4
- Views: 1017
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.
- Fri Oct 12, 2018 11:30 am
- Forum: Photoelectric Effect
- Topic: Confusion on Photoelectric Effect
- Replies: 2
- Views: 249
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 ...
- Fri Oct 05, 2018 1:10 pm
- Forum: Balancing Chemical Reactions
- Topic: How To....
- Replies: 16
- Views: 2638
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...
- Fri Oct 05, 2018 1:00 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Avogadro's Number
- Replies: 9
- Views: 1073
Re: Avogadro's Number
you would use avagadro's number for both molecules and atoms
- Thu Oct 04, 2018 7:40 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: E. 15 (7th Edition)
- Replies: 2
- Views: 269
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.