Search found 30 matches
- Fri Dec 07, 2018 1:36 pm
- Forum: Ionic & Covalent Bonds
- Topic: Inter and Intramolecular Forces
- Replies: 3
- Views: 558
Inter and Intramolecular Forces
What is the difference between intra and inter molecular forces?
- Fri Dec 07, 2018 1:17 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Strong Acids [ENDORSED]
- Replies: 1
- Views: 293
Re: Strong Acids [ENDORSED]
The short list would include these 7 strong acids:
HCL
HBr
HI
HNO3
HCLO4
HCLO3
H2SO4
HCL
HBr
HI
HNO3
HCLO4
HCLO3
H2SO4
- Fri Dec 07, 2018 1:12 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Polyatomic Ions- London forces
- Replies: 1
- Views: 664
Re: Polyatomic Ions- London forces
All ions or molecules have London Dispersion Forces
- Sun Dec 02, 2018 12:12 am
- Forum: Hybridization
- Topic: lone pairs
- Replies: 20
- Views: 2119
Re: lone pairs
One example of this would be the the molecule H^2O. The central atom, oxygen has two bonds ( one with each hydrogen ) and two sets of lones pairs. Therefore the hybridization of oxygen would sp^3.
- Sun Dec 02, 2018 12:09 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Lone Pairs
- Replies: 5
- Views: 911
Re: Lone Pairs
One example of a specific lone pair placement would be that in a molecule with square pyramidal geometry, the lone pair would be on the axial plane rather than the equatorial plane.
- Sun Dec 02, 2018 12:04 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: pi and sigma bonds
- Replies: 3
- Views: 828
Re: pi and sigma bonds
Pi bonds are essentially parallel bonds, so movement from the plane is difficult. However, it is important to note that there can be a strained double bonds that are slightly twisted
- Sun Nov 25, 2018 6:10 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sigma vs pi bonds
- Replies: 7
- Views: 764
Re: Sigma vs pi bonds
Also, sigma bonds are generally more stable than pi bonds due to the fact that there is greater orbital overlap in sigma bonds
- Sun Nov 25, 2018 6:07 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent/Angular Shape
- Replies: 4
- Views: 555
Re: Bent/Angular Shape
A bent molecule can also refer to a molecule with two bonds and one lone pair or a molecule with two bonds and two lone pairs.
- Sun Nov 25, 2018 12:19 pm
- Forum: Lewis Structures
- Topic: Lewis Structures
- Replies: 2
- Views: 271
Re: Lewis Structures
Place all the nitrogen atoms in a straight line and then find the best structure using formal charges.
- Sun Nov 18, 2018 8:00 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 7th edition 2E.13
- Replies: 3
- Views: 391
Re: 7th edition 2E.13
The drawing depicts a 180-degree bond angle both horizontally and vertically, so the orientation does not matter.
- Sun Nov 18, 2018 7:57 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecules with more than 2 different elements
- Replies: 3
- Views: 330
Re: Molecules with more than 2 different elements
An atom with the same element would not be polar because there would be no difference in electronegativity.
- Sun Nov 18, 2018 7:55 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: lone pairs and bond angle
- Replies: 6
- Views: 707
Re: lone pairs and bond angle
For example, a molecule with 4 bonds has a bond angle of 109.5 degrees while a molecule with 3 bonds and one lone pair has a bond angle of less than a 109.5 degress
- Sun Nov 11, 2018 10:05 pm
- Forum: Coordinate Covalent Bonds
- Topic: Question 3.87 (Sixth Edition)
- Replies: 2
- Views: 546
Re: Question 3.87 (Sixth Edition)
To solve this problem it is important to look at the atomic radius.The shorter the atomic radius, the stronger the bond. This is because shorter bonds mean stronger bonds.
- Sun Nov 11, 2018 9:59 pm
- Forum: Ionic & Covalent Bonds
- Topic: Differentiating between Covalent and Ionic
- Replies: 3
- Views: 409
Re: Differentiating between Covalent and Ionic
Ionic bonds involve donating an electron while in covalent bonds electrons are shared
- Sat Nov 10, 2018 6:16 pm
- Forum: Ionic & Covalent Bonds
- Topic: How many forces can bonds have?
- Replies: 2
- Views: 287
Re: How many forces can bonds have?
It is also important to note that dispersion, london, van der vals, and dipole induced dipole are all different names that refer to the same force.
- Thu Nov 01, 2018 11:41 pm
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity???
- Replies: 3
- Views: 432
Re: Electron Affinity???
This question is an exception to the general rule and the fact that sulfur has a higher electron affinity than oxygen was found through experimentation.
- Thu Nov 01, 2018 11:38 pm
- Forum: Trends in The Periodic Table
- Topic: Electron affinity homework 1F.11
- Replies: 2
- Views: 401
Re: Electron affinity homework 1F.11
In addition to the general trend of electron affinity being higher on the right, electron affinity generally decreases down a group
- Thu Nov 01, 2018 11:28 pm
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity
- Replies: 5
- Views: 601
Re: Electron Affinity
The overall trend for electron affinity is that it increases across a period and decreases down a group
- Sun Oct 28, 2018 10:14 pm
- Forum: Trends in The Periodic Table
- Topic: Topic 1F.11c electron affinity
- Replies: 2
- Views: 325
Re: Topic 1F.11c electron affinity
With regards to the oxygen and sulfur question, if you look at it "normally" along the trend line it makes sense that oxygen has a higher electron affinity. However, as mentioned in the original question, electron affinity is not perfect. Experimental findings show that sulfur has a higher...
- Sun Oct 28, 2018 10:05 pm
- Forum: Trends in The Periodic Table
- Topic: Electron configuration exceptions
- Replies: 3
- Views: 476
Re: Electron configuration exceptions
An example of this irregularity would be that that the electron configuration of Copper(Cu) would be [Ar]3d^10, 4s^1. Instead of having 9 electrons in the d subshell, the elements would be at a lower potential energy with 10 electrons, taking one away from the s subshell.
- Sun Oct 28, 2018 10:00 pm
- Forum: Trends in The Periodic Table
- Topic: Diagonal Relationship
- Replies: 3
- Views: 394
Re: Diagonal Relationship
I'm assuming that you mean the diagonal relationship of electronegativity? What that means is that electronegativity increases as you move from left to right across a period and decreases as you move down a group. These average of those two trends lead to a diagonal trend line across the periodic ta...
- Sun Oct 21, 2018 4:27 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Slight Confusion
- Replies: 3
- Views: 387
Re: Slight Confusion
For the d orbritasl, the five configurations are dxy, dxz, dyz, dx^2y^2, and dz^2
- Sun Oct 21, 2018 4:21 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Effective Nuclear Charge
- Replies: 2
- Views: 289
Re: Effective Nuclear Charge
It is also important to note that effective nuclear charge tends to increase as you move from left to right on the periodic table.
- Sun Oct 21, 2018 4:18 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Effective Nuclear Charge
- Replies: 3
- Views: 391
Re: Effective Nuclear Charge
The Z-eff tends to increase as one moves from left to right on the periodic table
- Sat Oct 13, 2018 11:12 pm
- Forum: Properties of Electrons
- Topic: Module Photoelectric Effect
- Replies: 2
- Views: 209
Re: Module Photoelectric Effect
The energy required to remove an electron is essentially the work function converted to joules/atoms. To do that you first need to multiply a 150.6 kg times a 1000 to get a 150.6 x 10^3 J/mol. Then you have to divide by Avogadro's constant to convert the moles to atoms, thereby getting an answer of ...
- Sat Oct 13, 2018 11:02 pm
- Forum: Photoelectric Effect
- Topic: Module Question 30 (Part C)
- Replies: 1
- Views: 184
Re: Module Question 30 (Part C)
From parts A and B of this problem we find out that the kinetic energy is 1.99 x 10^-19 J and the work is 2.5 x 10^-19 J. If we add the kinetic energy and work together we get the energy of the photon, which is 4.49 x 10^-19. Energy of the photon = plank's constant x frequency When we plug in the en...
- Sat Oct 13, 2018 10:53 pm
- Forum: Photoelectric Effect
- Topic: Module Question 29 (Part B)
- Replies: 4
- Views: 515
Re: Module Question 29 (Part B)
The energy needed to remove an electron from one sodium atom is simply the work function converted to the right units(J/atom)
You would have to multiply 150.6 kg/mol by 1000 to get 150.6*10^3 J/mol. Then you would divide that number by Avagadro's constant to get the answer 2.5*10^-19 J/atom.
You would have to multiply 150.6 kg/mol by 1000 to get 150.6*10^3 J/mol. Then you would divide that number by Avagadro's constant to get the answer 2.5*10^-19 J/atom.
- Thu Oct 04, 2018 6:15 pm
- Forum: Empirical & Molecular Formulas
- Topic: How to write empirical/ molecular formulas
- Replies: 3
- Views: 379
Re: How to write empirical/ molecular formulas
Additionally when you write the formula for a compound with a metal and nonmental, you typically list the metal before the nonmental in the formula
- Thu Oct 04, 2018 2:05 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: L.37 part B
- Replies: 1
- Views: 127
L.37 part B
For 100 ml of the diluted solution, what would the molarity be?
- Thu Oct 04, 2018 1:56 pm
- Forum: SI Units, Unit Conversions
- Topic: L.35
- Replies: 1
- Views: 143
L.35
The solution's manual states that the conversion from tons to kilograms is 1-ton equals a 100 kilograms. However, when I searched it up, Google states that 1 ton is about 907 kilograms. Is it okay to use either conversion?