Search found 27 matches
- Mon Jun 11, 2018 1:14 pm
- Forum: Conjugate Acids & Bases
- Topic: Section 12.10
- Replies: 2
- Views: 416
Re: Section 12.10
I think thats correct, and yes oxoacid an oxyacid are the same thing.
- Mon Jun 11, 2018 1:12 pm
- Forum: Amphoteric Compounds
- Topic: Amphoteric Compiund
- Replies: 2
- Views: 520
Re: Amphoteric Compiund
An amphoteric compound can function as an acid or a base depending on whether the other compound in the reaction is an acid or a base. It will act as the opposite of the other compound in the reaction
- Mon Jun 11, 2018 1:07 pm
- Forum: Bronsted Acids & Bases
- Topic: Writing the chemical equation for proton transfers
- Replies: 2
- Views: 653
Re: Writing the chemical equation for proton transfers
If they have no effect of the pH then you can leave them out of the equation. The two examples he gave in class were Na+ and Cl-
- Sun Jun 03, 2018 10:48 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular vs. VSEPR shape
- Replies: 3
- Views: 346
Re: Molecular vs. VSEPR shape
I think the VSEPR shape is determined by the number of regions of electron density and the molecular shape is the actual shape of the molecule once the lone pairs have been accounted for. My TA used IF 4 + as an example. It has 5 regions of electron density so its VSEPR shape is trigonal bipyramidal...
- Sun Jun 03, 2018 10:42 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Pi/Sigma bonds clarification
- Replies: 4
- Views: 409
Re: Pi/Sigma bonds clarification
sigma bonds overlap end-to-end and pi bonds overlap side-to-side if that helps
- Sun Jun 03, 2018 10:38 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR
- Replies: 7
- Views: 943
Re: VSEPR
My TA gave us a helpful chart: Regions of e- density e- arrangement ------------------------------------------------------------- 2 linear 3 trigonal planar 4 tetrahedral 5 trigonal bipyramidal 6 octahedral And also remember the VSEPR formula: AXE A= central atom X= number of bound atoms E= number o...
- Sun May 20, 2018 10:58 pm
- Forum: Dipole Moments
- Topic: Meaning of a dipole
- Replies: 7
- Views: 784
Re: Meaning of a dipole
A dipole occurs between two covalently bonded atoms where one is more electronegative than the other. This difference creates a separation of electrical charges
- Sun May 20, 2018 10:54 pm
- Forum: Bond Lengths & Energies
- Topic: Pentane vs. 2-dimethylpropane
- Replies: 3
- Views: 3217
Re: Pentane vs. 2-dimethylpropane
A rod shape is stronger than a spherical shape because a rod shape allows the positive and negative charges on the molecule to be closer together, since pentane is in a rod shape it has a higher melting point than 2-dimethylpropane
- Sun May 20, 2018 10:50 pm
- Forum: Resonance Structures
- Topic: Resonance Structures
- Replies: 9
- Views: 1111
Re: Resonance Structures
I think the overall formal charge should be the same for each resonance structure, the formal charges of the individual elements in the molecule could be different because of the different bond placements, but overall I think it should be the same.
- Wed May 09, 2018 4:08 pm
- Forum: Ionic & Covalent Bonds
- Topic: Periodic Trends
- Replies: 3
- Views: 432
Re: Periodic Trends
I dont think professor Lavelle has gone over covalent radius yet, if hes even going to.
- Wed May 09, 2018 4:03 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 2.29
- Replies: 3
- Views: 491
Re: 2.29
Today in the review session we were also given an equation for finding the number of electrons using l, 4l+2
- Wed May 09, 2018 4:01 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: HW Problem 2.39
- Replies: 2
- Views: 340
Re: HW Problem 2.39
I dont think we need to know the e- configuration for an atom in its excited state we just need to be able to recognize when its in its excited state. Im pretty sure if it violates one of the three rules (pauli, hund, aufbau) then its in the excited state
- Sun May 06, 2018 10:49 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 3d before 4s
- Replies: 9
- Views: 1052
Re: 3d before 4s
^Yes because 4d is at a lower energy level than 5s
- Sun May 06, 2018 10:46 pm
- Forum: Trends in The Periodic Table
- Topic: Stability of Cl vs Cl-
- Replies: 6
- Views: 2246
Re: Stability of Cl vs Cl-
Having a full octet means the atom is more stable and therefore less reactive because it does not need to gain or lose any electrons.
- Sun May 06, 2018 10:38 pm
- Forum: Trends in The Periodic Table
- Topic: Unicorn practice test 6d.
- Replies: 3
- Views: 410
Re: Unicorn practice test 6d.
Its because of half shell stability, N has 3 electrons in the 2p orbital so half the 2p orbital is filled. O has 4 electrons and in order to become more stable it wants to lose the electron to achieve half shell stability.
- Sun Apr 29, 2018 5:32 pm
- Forum: Einstein Equation
- Topic: Difference Between Equations [ENDORSED]
- Replies: 4
- Views: 837
Re: Difference Between Equations [ENDORSED]
They are basically the same equation E=hc/λ is just the derived version of E=hv since v=c/λ.
- Sun Apr 29, 2018 5:30 pm
- Forum: Einstein Equation
- Topic: Hw problem 1.59 [ENDORSED]
- Replies: 3
- Views: 593
Re: Hw problem 1.59 [ENDORSED]
Use that equation and plug in the values/constants then since E is the energy for one photon just multiply by the amount of photons to get the answer
- Sun Apr 29, 2018 5:24 pm
- Forum: Properties of Light
- Topic: Test #2: Q6 [ENDORSED]
- Replies: 10
- Views: 1259
Re: Test #2: Q6 [ENDORSED]
I initially used the derived equation λ=hc/E but I realized it was easier to just use λ=c/v because all the values are given to you, but yes you are on the right track
- Sun Apr 22, 2018 5:46 pm
- Forum: Einstein Equation
- Topic: Combining E=hv and c=ƛv [ENDORSED]
- Replies: 7
- Views: 5270
Re: Combining E=hv and c=ƛv [ENDORSED]
from c=λv you solve for v and get v=c/λ. You substitute c/λ for v in the E=hv equation and get E=hc/λ
- Sun Apr 22, 2018 5:39 pm
- Forum: DeBroglie Equation
- Topic: Wavelength and De Broglie Equation [ENDORSED]
- Replies: 9
- Views: 965
Re: Wavelength and De Broglie Equation [ENDORSED]
Not necessarily because De Broglie cannot be used for light but it can be used for things with mass.
- Sun Apr 22, 2018 5:37 pm
- Forum: DeBroglie Equation
- Topic: DeBrogile Module
- Replies: 6
- Views: 516
Re: DeBrogile Module
I agree it definitely needs to be converted so maybe just check your conversion values.
- Sat Apr 14, 2018 10:33 pm
- Forum: Empirical & Molecular Formulas
- Topic: Combustion Reaction [ENDORSED]
- Replies: 6
- Views: 630
Re: Combustion Reaction [ENDORSED]
Im pretty sure its always the combustion element + oxygen ---> H2O + CO2 so yes? Im not sure what you mean by "solve for"
- Sat Apr 14, 2018 10:27 pm
- Forum: Properties of Light
- Topic: What is the speed of life though
- Replies: 3
- Views: 369
Re: What is the speed of life though
its also a book by Carol Weston
- Sat Apr 14, 2018 10:21 pm
- Forum: Properties of Light
- Topic: formula for light problems
- Replies: 2
- Views: 383
Re: formula for light problems
It depends on the values you have and what you are solving for. Its not always necessary to rearrange equations it just depends on what you're given to begin with.
- Sat Apr 14, 2018 10:16 pm
- Forum: Properties of Light
- Topic: Units for Wavelengths [ENDORSED]
- Replies: 4
- Views: 339
Re: Units for Wavelengths [ENDORSED]
Units depend on the question. If it asks for specific units convert to those units. If it doesn't then use whatever units are used for the given values. The important thing is to use the same units when you are actually calculating the values.
- Sat Apr 14, 2018 10:10 pm
- Forum: Properties of Light
- Topic: help on the question from Fridays lecture [ENDORSED]
- Replies: 2
- Views: 262
Re: help on the question from Fridays lecture [ENDORSED]
He just plugged in the values. h and c are constants (planck's constant and the speed of light) and they will always be given to us. E is the value given in the problem (3.61 x 10^-14 J). by solving the equation (lambda=hc/E) you get the answer in meters which he then converted to nano meters.
- Sat Apr 14, 2018 10:01 pm
- Forum: Properties of Light
- Topic: wavelength description [ENDORSED]
- Replies: 11
- Views: 1180
Re: wavelength description [ENDORSED]
Amplitude is the height of the wave, wavelength is the distance from crest to crest or trough to trough