Search found 18 matches

by Aaron_Trell_2J
Sat Mar 18, 2017 8:05 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Memorize C-H torsional strain values?
Replies: 2
Views: 573

Re: Memorize C-H torsional strain values?

I don't think you have to memorize the exact values but it would be helpful to know which conformations have higher energy values than others. You can usually figure this out by looking at which atoms are under strain (e.g. a C atom and H atom, two C atoms or 2 H atoms).
by Aaron_Trell_2J
Sun Mar 12, 2017 1:29 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7408
Views: 979976

Re: Post All Chemistry Jokes Here

Q: Want to hear a joke about sodium hypobromite?
A: NaBrO
by Aaron_Trell_2J
Sun Mar 05, 2017 4:44 pm
Forum: *Alkanes
Topic: More or less nucleophilic?
Replies: 2
Views: 333

Re: More or less nucleophilic?

I believe that it is based on the electronegativity of the molecules that you are talking about. A higher electronegativity means that the molecule is more nucleophilic.
by Aaron_Trell_2J
Sun Feb 26, 2017 7:33 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2
Replies: 1
Views: 195

Re: Quiz 2

In the past I believe we have received our quizzes back in the discussion section following the quiz so you should expect to get your quiz back this week.
by Aaron_Trell_2J
Sun Feb 19, 2017 4:37 pm
Forum: General Science Questions
Topic: Sig Figs
Replies: 5
Views: 944

Re: Sig Figs

If given a question where it says to calculate something such as the standard enthalpies of formation then you would not use the 25 degrees celsius value in determining the number of sig figs. However, if the problem has to do with calculating something that is not at standard conditions then I beli...
by Aaron_Trell_2J
Sun Feb 12, 2017 10:46 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7408
Views: 979976

Re: Post All Chemistry Jokes Here

Q: Anyone know any jokes about sodium? A: Na
by Aaron_Trell_2J
Sun Feb 05, 2017 5:07 pm
Forum: Phase Changes & Related Calculations
Topic: Why does it take more energy for a phase change to occur from a liquid to gas than a solid to liquid?
Replies: 2
Views: 1123

Re: Why does it take more energy for a phase change to occur from a liquid to gas than a solid to liquid?

Also, if you want to associate this change with a real world example just think about the process of boiling water vs melting ice. It is much easier to melt ice if heat is applied to it while it takes a much longer time to completely vaporize the same mass of water.
by Aaron_Trell_2J
Sun Jan 29, 2017 2:34 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: delta S surrounding vs. delta S system vs. delta S total
Replies: 2
Views: 1161

Re: delta S surrounding vs. delta S system vs. delta S total

I believe that the only time that there is no change in delta S for the universe is when the system is at equilibrium. Also an isothermal reaction can still create a difference in entropy since usually in a reaction heat is either given off or added to the system. Isothermal just means that the reac...
by Aaron_Trell_2J
Sun Jan 22, 2017 2:33 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: General Definition of Entropy [ENDORSED]
Replies: 1
Views: 295

General Definition of Entropy [ENDORSED]

As of right now I understand entropy to be a measure of the disorder of a system. My question is how does entropy relate to concepts such as chemical reactions and other processes?
by Aaron_Trell_2J
Sun Jan 15, 2017 2:38 pm
Forum: Phase Changes & Related Calculations
Topic: Explanation of Absorbing energy vs. Releasing energy
Replies: 2
Views: 276

Re: Explanation of Absorbing energy vs. Releasing energy

I believe that breaking bonds absorbs energy because energy is needed in order to break a bond. For example when H2O is heated to the point where it is turning from the liquid state to gas state, constant energy is being applied in the form of heat and bonds are being broken. And on the other hand w...
by Aaron_Trell_2J
Mon Dec 05, 2016 12:47 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7408
Views: 979976

Re: Post All Chemistry Jokes Here

Silver walks up to Gold in a bar and says, "AU, get outta here!"
by Aaron_Trell_2J
Sun Nov 27, 2016 6:17 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Change in molarity
Replies: 2
Views: 316

Re: Change in molarity

Typically we only assign "x" to be a change in molarity. "x" is only used if the information we are given is not enough to calculate certain equilibrium values using the equilibrium constant equations. Typically in these cases we end up using the quadratic formula.
by Aaron_Trell_2J
Mon Nov 14, 2016 2:24 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate [ENDORSED]
Replies: 2
Views: 411

Re: Polydentate [ENDORSED]

The term polydentate means that there is more than one ligand bonded to the transition metal. For example tridentate just means that there are three ligands attached to the transition metal.
by Aaron_Trell_2J
Sun Nov 06, 2016 2:30 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7408
Views: 979976

Re: Post All Chemistry Jokes Here

What kind of fish is made out of 2 sodium atoms?

2 Na
by Aaron_Trell_2J
Sun Oct 30, 2016 1:11 pm
Forum: Dipole Moments
Topic: Polar and Non-polar bond
Replies: 8
Views: 896

Re: Polar and Non-polar bond

I believe you can also look at all of the dipole moments in a particular molecule and if all of these vectors cancel out then you have a non polar molecule and if they don't then you will have a polar molecule.
by Aaron_Trell_2J
Mon Oct 17, 2016 2:58 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration for Transition metals? [ENDORSED]
Replies: 1
Views: 309

Re: Electron Configuration for Transition metals? [ENDORSED]

Within the transition metals there are some special cases with electron configurations. As for silver the reason that the 4d orbital is filled out before the 5s gets filled is because silver is more stable when the d orbital is filled compared to the s orbital. There are other exceptions in the tran...
by Aaron_Trell_2J
Sun Oct 09, 2016 1:30 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wavelength (+ or -) [ENDORSED]
Replies: 1
Views: 260

Re: Wavelength (+ or -) [ENDORSED]

I believe that wavelength is always a positive value since it is a measured length and it would be impossible to have a negative length. Hope this helps.
by Aaron_Trell_2J
Thu Sep 29, 2016 5:21 pm
Forum: Photoelectric Effect
Topic: Wave-Particle Duality and Equations Used
Replies: 1
Views: 237

Re: Wave-Particle Duality and Equations Used

Both of the equations that you mentioned can be used in the same problem (assuming you are talking about the photoelectric effect). For example if the problem asks you to calculate the energy of the light source and you are given the frequency you can simply use the equation E=h x (frequency). Howev...

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