Search found 27 matches

by Elena 1H
Mon Jun 11, 2018 1:14 pm
Forum: Conjugate Acids & Bases
Topic: Section 12.10
Replies: 2
Views: 212

Re: Section 12.10

I think thats correct, and yes oxoacid an oxyacid are the same thing.
by Elena 1H
Mon Jun 11, 2018 1:12 pm
Forum: Amphoteric Compounds
Topic: Amphoteric Compiund
Replies: 2
Views: 227

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
by Elena 1H
Mon Jun 11, 2018 1:07 pm
Forum: Bronsted Acids & Bases
Topic: Writing the chemical equation for proton transfers
Replies: 2
Views: 218

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-
by Elena 1H
Sun Jun 03, 2018 10:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular vs. VSEPR shape
Replies: 3
Views: 76

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...
by Elena 1H
Sun Jun 03, 2018 10:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Pi/Sigma bonds clarification
Replies: 4
Views: 116

Re: Pi/Sigma bonds clarification

sigma bonds overlap end-to-end and pi bonds overlap side-to-side if that helps
by Elena 1H
Sun Jun 03, 2018 10:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 7
Views: 218

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...
by Elena 1H
Sun May 20, 2018 10:58 pm
Forum: Dipole Moments
Topic: Meaning of a dipole
Replies: 7
Views: 192

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
by Elena 1H
Sun May 20, 2018 10:54 pm
Forum: Bond Lengths & Energies
Topic: Pentane vs. 2-dimethylpropane
Replies: 3
Views: 299

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
by Elena 1H
Sun May 20, 2018 10:50 pm
Forum: Resonance Structures
Topic: Resonance Structures
Replies: 9
Views: 435

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.
by Elena 1H
Wed May 09, 2018 4:08 pm
Forum: Ionic & Covalent Bonds
Topic: Periodic Trends
Replies: 3
Views: 142

Re: Periodic Trends

I dont think professor Lavelle has gone over covalent radius yet, if hes even going to.
by Elena 1H
Wed May 09, 2018 4:03 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2.29
Replies: 3
Views: 191

Re: 2.29

Today in the review session we were also given an equation for finding the number of electrons using l, 4l+2
by Elena 1H
Wed May 09, 2018 4:01 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: HW Problem 2.39
Replies: 2
Views: 138

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
by Elena 1H
Sun May 06, 2018 10:49 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 3d before 4s
Replies: 9
Views: 291

Re: 3d before 4s

^Yes because 4d is at a lower energy level than 5s
by Elena 1H
Sun May 06, 2018 10:46 pm
Forum: Trends in The Periodic Table
Topic: Stability of Cl vs Cl-
Replies: 6
Views: 240

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.
by Elena 1H
Sun May 06, 2018 10:38 pm
Forum: Trends in The Periodic Table
Topic: Unicorn practice test 6d.
Replies: 3
Views: 164

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.
by Elena 1H
Sun Apr 29, 2018 5:32 pm
Forum: Einstein Equation
Topic: Difference Between Equations [ENDORSED]
Replies: 4
Views: 230

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.
by Elena 1H
Sun Apr 29, 2018 5:30 pm
Forum: Einstein Equation
Topic: Hw problem 1.59 [ENDORSED]
Replies: 3
Views: 265

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
by Elena 1H
Sun Apr 29, 2018 5:24 pm
Forum: Properties of Light
Topic: Test #2: Q6 [ENDORSED]
Replies: 10
Views: 540

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
by Elena 1H
Sun Apr 22, 2018 5:46 pm
Forum: Einstein Equation
Topic: Combining E=hv and c=ƛv [ENDORSED]
Replies: 7
Views: 344

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
by Elena 1H
Sun Apr 22, 2018 5:39 pm
Forum: DeBroglie Equation
Topic: Wavelength and De Broglie Equation [ENDORSED]
Replies: 9
Views: 288

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.
by Elena 1H
Sun Apr 22, 2018 5:37 pm
Forum: DeBroglie Equation
Topic: DeBrogile Module
Replies: 6
Views: 200

Re: DeBrogile Module

I agree it definitely needs to be converted so maybe just check your conversion values.
by Elena 1H
Sat Apr 14, 2018 10:33 pm
Forum: Empirical & Molecular Formulas
Topic: Combustion Reaction [ENDORSED]
Replies: 6
Views: 249

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"
by Elena 1H
Sat Apr 14, 2018 10:27 pm
Forum: Properties of Light
Topic: What is the speed of life though
Replies: 3
Views: 180

Re: What is the speed of life though

its also a book by Carol Weston
by Elena 1H
Sat Apr 14, 2018 10:21 pm
Forum: Properties of Light
Topic: formula for light problems
Replies: 2
Views: 108

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.
by Elena 1H
Sat Apr 14, 2018 10:16 pm
Forum: Properties of Light
Topic: Units for Wavelengths [ENDORSED]
Replies: 4
Views: 119

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.
by Elena 1H
Sat Apr 14, 2018 10:10 pm
Forum: Properties of Light
Topic: help on the question from Fridays lecture [ENDORSED]
Replies: 2
Views: 91

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.
by Elena 1H
Sat Apr 14, 2018 10:01 pm
Forum: Properties of Light
Topic: wavelength description [ENDORSED]
Replies: 11
Views: 372

Re: wavelength description [ENDORSED]

Amplitude is the height of the wave, wavelength is the distance from crest to crest or trough to trough

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