Search found 20 matches
- Fri Dec 08, 2017 10:50 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Le chateliers principle
- Replies: 3
- Views: 536
Re: Le chateliers principle
Le Chatliers' Principle is the idea that a chemical reaction will adjust to minimize the effects of change back to the equilibrium constant. For example, if one increases the pressure of the reaction then the volume will decrease and the reaction will move in the direction where there are fewer mole...
- Mon Dec 04, 2017 7:21 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted Acid and Base vs Lewis Acid and Base
- Replies: 3
- Views: 709
Bronsted Acid and Base vs Lewis Acid and Base
Can someone explain to me the relationship between Bronsted acid/base and Lewis acid/base?
- Mon Dec 04, 2017 1:40 am
- Forum: Sigma & Pi Bonds
- Topic: Difference between Bonds [ENDORSED]
- Replies: 7
- Views: 1130
Re: Difference between Bonds [ENDORSED]
Yes there always has to be a sigma bond because every covalent molecule has a sigma bond while not every covalent molecule has a pi bond. Pi bonds are onl;y found in double or triplr bonds.
- Sun Dec 03, 2017 9:47 pm
- Forum: Biological Examples
- Topic: Biological Compunds [ENDORSED]
- Replies: 2
- Views: 543
Re: Biological Compunds [ENDORSED]
I think you should know it for the final. You should especially know hemoglobin, vitamin b, and myoglobin.
- Sun Nov 26, 2017 7:42 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: How to predict bond angles?
- Replies: 3
- Views: 1038
Re: How to predict bond angles?
If there are no lone pairs on the molecule, then the molecular shape will be same as the electron arrangement. When lone pairs are present, the molecular shape of the molecule will be different from the electron arrangement. For example, h20 has four places of electron concentration, so the electron...
- Sun Nov 26, 2017 7:31 pm
- Forum: Naming
- Topic: Naming differences
- Replies: 2
- Views: 418
Re: Naming differences
I read that they are the name of the same ligand.
- Sun Nov 19, 2017 7:40 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Si02 VSEPR
- Replies: 2
- Views: 8084
Re: Si02 VSEPR
By drawing the Lewis Structure, you will see that the most stable structure is O=Si=O. The electron arrangement and molecular shape are both linear. Since SiO2 has two places of electron concentration and no lone pairs, it is linear.
- Sun Nov 19, 2017 4:43 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 4
- Views: 518
Re: Bond Angles
I believe you do not have to memorize all the bond angles except for the ones you have listed. Instead, you should just know if the bonds are less than a certain angle due to lone pairs.
- Sun Nov 12, 2017 5:12 pm
- Forum: Resonance Structures
- Topic: Understanding Resonance Structures
- Replies: 6
- Views: 945
Re: Understanding Resonance Structures
When a molecule has a resonance structure, then it will also have delocalized electrons which are electrons that are not associated with just one atom or bond.
- Sat Nov 11, 2017 8:53 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: lewis structure and vsepr
- Replies: 3
- Views: 431
lewis structure and vsepr
When determining, the vsepr of a molecule, do we have to draw the lowest energy Lewis structure of the molecule first and then determine the vsepr?
- Sun Nov 05, 2017 8:43 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic Bonds Having Covalent Character
- Replies: 2
- Views: 494
Re: Ionic Bonds Having Covalent Character
Ionic bonds can have covalent character because the cation's positive charge will attract the anion's electron, so the anion's electron cloud will be distorted towards the cation. This electron cloud distortion can be considered as a bond that acts like a covalent bond. Ionic bonds will have more co...
- Sat Nov 04, 2017 2:41 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Poloarizability
- Replies: 2
- Views: 425
Poloarizability
What exactly is an electron cloud? In an ionic compound like NaCl, will the distorted electron cloud always belong to the anion?
- Sat Oct 28, 2017 1:32 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: anion vs. cation [ENDORSED]
- Replies: 2
- Views: 474
Re: anion vs. cation [ENDORSED]
Cation's atomic radius is usually smaller than an anion's atomic radius because the removal of an electron will cause the effective nuclear charge to become more prominent on the other electrons while the addition of an electron will cause an increase in valence electrons and have more repulsive for...
- Wed Oct 25, 2017 11:01 pm
- Forum: Lewis Structures
- Topic: drawing Lewis structures [ENDORSED]
- Replies: 2
- Views: 418
drawing Lewis structures [ENDORSED]
When we are trying to draw Lewis Structures, why is it that the lowest ionization element goes into the center such as the Lewis structure for sulfate?
- Sat Oct 21, 2017 5:11 pm
- Forum: *Particle in a Box
- Topic: Use of Rydberg formula [ENDORSED]
- Replies: 2
- Views: 1025
Re: Use of Rydberg formula [ENDORSED]
You can always derive the Rydberg Equation from E= hR/(n1)^2 - hR/(n2)^2 by dividing each side of the equation by h because the formula for frequency is E= hv.
- Sat Oct 21, 2017 4:57 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Negative Energy Near the Nucleus [ENDORSED]
- Replies: 2
- Views: 464
Negative Energy Near the Nucleus [ENDORSED]
Why is the energy most negative when it is near the nucleus? I understand that the equation E= -hR/n^2 shows that the energy will be a greater negative when n is a small number, but why is the energy negative?
- Wed Oct 11, 2017 11:14 pm
- Forum: Properties of Light
- Topic: Question 1.15
- Replies: 1
- Views: 394
Re: Question 1.15
The Rydberg formula is a formula to find the wavelength of an electron when it moves between different energy levels. You would use the formula v = R(1/n1^2 - 1/n2^2). n1 is 2 while n2 is 4. Since v = R(1/n1^2 - 1/n2^2), you can plug it into c=vλ, so it will look like c = R(1/n1^2 - 1/n2^2)λ. R is a...
- Wed Oct 11, 2017 10:58 pm
- Forum: Photoelectric Effect
- Topic: Q31 from online assessment
- Replies: 4
- Views: 1023
Re: Q31 from online assessment
First you want to identify what the problem is giving you. It says that the velocity of the electron is 6.61 x 105 m.s-1 and the work function is 150.6 kJ.mol-1. You need to convert 150.6 kJ.mol-1. to electrons by dividing 150.6 kJ.mol-1. by 6.022*10^23 convert the value into joules, so it would be ...
- Sat Oct 07, 2017 6:39 pm
- Forum: Properties of Light
- Topic: Amplitude of the wave [ENDORSED]
- Replies: 7
- Views: 1386
Re: Amplitude of the wave [ENDORSED]
The amplitude of the wave does correlate with the amount of energy because intensity which is the brightness is the square of the amplitude. If the amplitude is high then the intensity will also be high.
- Thu Oct 05, 2017 1:20 am
- Forum: Limiting Reactant Calculations
- Topic: L #39
- Replies: 4
- Views: 542
Re: L #39
The empirical formula will still be the same even if you use 02 by changing the molar mass to 32 grams and solving for the moles. Then you would divide both the Tin and the Oxygen by the lowest number, and the result will be Sn02.