Search found 20 matches

by An Dang 3F
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: 292

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...
by An Dang 3F
Mon Dec 04, 2017 7:21 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted Acid and Base vs Lewis Acid and Base
Replies: 3
Views: 253

Bronsted Acid and Base vs Lewis Acid and Base

Can someone explain to me the relationship between Bronsted acid/base and Lewis acid/base?
by An Dang 3F
Mon Dec 04, 2017 1:40 am
Forum: Sigma & Pi Bonds
Topic: Difference between Bonds [ENDORSED]
Replies: 7
Views: 539

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.
by An Dang 3F
Sun Dec 03, 2017 9:47 pm
Forum: Biological Examples
Topic: Biological Compunds [ENDORSED]
Replies: 2
Views: 286

Re: Biological Compunds [ENDORSED]

I think you should know it for the final. You should especially know hemoglobin, vitamin b, and myoglobin.
by An Dang 3F
Sun Nov 26, 2017 7:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: How to predict bond angles?
Replies: 3
Views: 297

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...
by An Dang 3F
Sun Nov 26, 2017 7:31 pm
Forum: Naming
Topic: Naming differences
Replies: 2
Views: 160

Re: Naming differences

I read that they are the name of the same ligand.
by An Dang 3F
Sun Nov 19, 2017 7:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Si02 VSEPR
Replies: 2
Views: 661

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.
by An Dang 3F
Sun Nov 19, 2017 4:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 4
Views: 238

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.
by An Dang 3F
Sun Nov 12, 2017 5:12 pm
Forum: Resonance Structures
Topic: Understanding Resonance Structures
Replies: 6
Views: 413

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.
by An Dang 3F
Sat Nov 11, 2017 8:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: lewis structure and vsepr
Replies: 3
Views: 203

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?
by An Dang 3F
Sun Nov 05, 2017 8:43 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Bonds Having Covalent Character
Replies: 2
Views: 201

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...
by An Dang 3F
Sat Nov 04, 2017 2:41 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Poloarizability
Replies: 2
Views: 238

Poloarizability

What exactly is an electron cloud? In an ionic compound like NaCl, will the distorted electron cloud always belong to the anion?
by An Dang 3F
Sat Oct 28, 2017 1:32 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: anion vs. cation [ENDORSED]
Replies: 2
Views: 215

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...
by An Dang 3F
Wed Oct 25, 2017 11:01 pm
Forum: Lewis Structures
Topic: drawing Lewis structures [ENDORSED]
Replies: 2
Views: 186

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?
by An Dang 3F
Sat Oct 21, 2017 5:11 pm
Forum: *Particle in a Box
Topic: Use of Rydberg formula [ENDORSED]
Replies: 2
Views: 568

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.
by An Dang 3F
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: 201

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?
by An Dang 3F
Wed Oct 11, 2017 11:14 pm
Forum: Properties of Light
Topic: Question 1.15
Replies: 1
Views: 182

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...
by An Dang 3F
Wed Oct 11, 2017 10:58 pm
Forum: Photoelectric Effect
Topic: Q31 from online assessment
Replies: 4
Views: 321

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 ...
by An Dang 3F
Sat Oct 07, 2017 6:39 pm
Forum: Properties of Light
Topic: Amplitude of the wave [ENDORSED]
Replies: 7
Views: 547

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.
by An Dang 3F
Thu Oct 05, 2017 1:20 am
Forum: Limiting Reactant Calculations
Topic: L #39
Replies: 4
Views: 262

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.

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