Search found 17 matches

by Amanda Reshke 1D
Wed Mar 09, 2016 9:43 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Strains
Replies: 5
Views: 685

Re: Strains

I believe that one of the differences between steric and torsional is that steric strain is caused by electron repulsion between atoms attached to the same central atom, while torsional strain is caused by electron repulsion between atoms that don't share a central atom..? I'm not 100% sure, anyone ...
by Amanda Reshke 1D
Thu Mar 03, 2016 8:39 pm
Forum: *Alkanes
Topic: Link to Video for Naming
Replies: 1
Views: 248

Link to Video for Naming

Thought I'd post a video that helped me out quite a bit! It's a Khan academy video on naming alkanes.
https://www.khanacademy.org/science/organic-chemistry/bond-line-structures-alkanes-cycloalkanes/naming-alkanes/v/naming-alkanes-with-alkyl-groups
by Amanda Reshke 1D
Mon Feb 29, 2016 9:42 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Cis/Trans and atomic number
Replies: 1
Views: 318

Cis/Trans and atomic number

Why do we pick the molecules with greater atomic number when identifying and determining whether something is cis/trans?
by Amanda Reshke 1D
Mon Feb 29, 2016 9:40 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Cis/Trans
Replies: 3
Views: 512

Re: Cis/Trans

Can cis and trans isomers also occur when there are triple bonds?
by Amanda Reshke 1D
Wed Feb 17, 2016 10:15 am
Forum: General Rate Laws
Topic: Helpful Video/clarifications on rate laws
Replies: 1
Views: 337

Helpful Video/clarifications on rate laws

Thought I'd share this super helpful video from Khan Academy! It gives clarification on rate laws and reaction order: https://www.khanacademy.org/science/chemistry/chem-kinetics/reaction-rates/v/rate-law-and-reaction-order
by Amanda Reshke 1D
Fri Feb 05, 2016 9:55 pm
Forum: Balancing Redox Reactions
Topic: Very helpful video on balancing redox reactions!
Replies: 1
Views: 266

Very helpful video on balancing redox reactions!

Just thought I'd pass on this video that I found to be super helpful! It's by Khan Academy and explains how to balance redox reactions in acid.
https://www.youtube.com/watch?v=4tLrbMstfm8
by Amanda Reshke 1D
Sun Jan 31, 2016 4:10 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: "Sign" use for Standard Reaction Enthalpy
Replies: 1
Views: 258

Re: "Sign" use for Standard Reaction Enthalpy

For Hess' law if you reverse a chemical equation you switch the sign on the enthalpy for that equation, and when you're not using Hess' law you do deltaH(Prod)-deltaH(React)
by Amanda Reshke 1D
Tue Jan 26, 2016 5:06 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Using Bond Enthalpies
Replies: 4
Views: 506

Re: Using Bond Enthalpies

I believe that the bond releases energy because once it's formed, it is finally at a stable state.
by Amanda Reshke 1D
Sat Jan 16, 2016 3:37 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Understanding q=-w
Replies: 2
Views: 423

Understanding q=-w

I'm a little confused about the equation q=-w and its conceptual implications; if someone could explain I'd be very grateful!
by Amanda Reshke 1D
Thu Jan 07, 2016 2:23 pm
Forum: Calculating Work of Expansion
Topic: Understanding the reversible, isothermal expansion equation
Replies: 1
Views: 287

Understanding the reversible, isothermal expansion equation

I was just wondering where the ln in the equation for reversible isothermal expansion comes from. Hopefully knowing that will help out with understanding the concept behind it as well?
The full equation is w= -nRT ln(V final/V initial)
by Amanda Reshke 1D
Fri Nov 27, 2015 11:26 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Video Submission: Lewis Structures, Hybridization
Replies: 1
Views: 382

Video Submission: Lewis Structures, Hybridization

Our video explains the answers to question 4 on the 2005 final for Chem 14A.
This video was created by Amanda Reshke and Meghna Madhavan.
*sidenote: we made a separate page with a YouTube link because our 497MB size wouldn't upload, so we had to cut down to 253MB in order for this to upload*
by Amanda Reshke 1D
Fri Nov 27, 2015 10:54 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Video Submission: Lewis Structures, Hybridization
Replies: 1
Views: 348

Video Submission: Lewis Structures, Hybridization

Our video explains the answers to question 4 on the 2005 final for Chem 14A. This video was created by Amanda Reshke and Meghna Madhavan. We tried uploading directly a few times, but it didn't work despite it being under 500MB (our video is 497MB), so we'll try to embed it instead. If it doesn't sho...
by Amanda Reshke 1D
Tue Nov 17, 2015 6:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Do I use an ICE box?
Replies: 4
Views: 693

Re: Do I use an ICE box?

I might be wrong, but you can probably just set the K equal to [products]/[reactants] and solve for Br (the product) (?)
by Amanda Reshke 1D
Fri Oct 30, 2015 10:11 am
Forum: Bond Lengths & Energies
Topic: Dissociation Theory
Replies: 2
Views: 859

Re: Dissociation Theory

I believe dissociation energy is the energy required to break (dissociate) a bond; essentially compounds with more ionic character would be easier to break apart (I usually associate ionic compounds with elements that are far apart on the periodic table- a good example is NaCl), and compounds with m...
by Amanda Reshke 1D
Sun Oct 18, 2015 2:37 pm
Forum: Properties of Light
Topic: HW 1.57 Balmer series
Replies: 3
Views: 658

Re: HW 1.57 Balmer series

I read somewhere that the spectral lines included in the Balmer series lie in the visible region, lines in the Lyman series lie in the UV region, and lines in the Paschen series are infrared. Hope this helped!
by Amanda Reshke 1D
Sat Oct 10, 2015 1:02 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Shells & Orbitals
Replies: 3
Views: 631

Re: Shells & Orbitals

I believe the two are the same and can generally be used interchangeably...however, if there is anything differentiating the two terms, 'orbital' could more specifically be used in language when regarding different shapes (of orbitals).
by Amanda Reshke 1D
Thu Oct 01, 2015 5:28 pm
Forum: Properties of Electrons
Topic: Clarifications on Electrons Changing Energy Levels
Replies: 4
Views: 564

Re: Clarifications on Electrons Changing Energy Levels

Speaking of atoms only absorbing specific energies, I was a bit confused about both the Balmer and Lyman series - are they unique to hydrogen or applicable to other elements?

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