Search found 18 matches
- 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: 1587
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).
- Sun Mar 12, 2017 1:29 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3862169
Re: Post All Chemistry Jokes Here
Q: Want to hear a joke about sodium hypobromite?
A: NaBrO
A: NaBrO
- Sun Mar 05, 2017 4:44 pm
- Forum: *Alkanes
- Topic: More or less nucleophilic?
- Replies: 2
- Views: 666
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.
- Sun Feb 26, 2017 7:33 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 2
- Replies: 1
- Views: 444
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.
- Sun Feb 19, 2017 4:37 pm
- Forum: General Science Questions
- Topic: Sig Figs
- Replies: 5
- Views: 1839
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...
- Sun Feb 12, 2017 10:46 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3862169
Re: Post All Chemistry Jokes Here
Q: Anyone know any jokes about sodium? A: Na
- 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: 9926
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.
- 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: 2353
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...
- Sun Jan 22, 2017 2:33 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: General Definition of Entropy [ENDORSED]
- Replies: 1
- Views: 572
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?
- Sun Jan 15, 2017 2:38 pm
- Forum: Phase Changes & Related Calculations
- Topic: Explanation of Absorbing energy vs. Releasing energy
- Replies: 2
- Views: 654
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...
- Mon Dec 05, 2016 12:47 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3862169
Re: Post All Chemistry Jokes Here
Silver walks up to Gold in a bar and says, "AU, get outta here!"
- Sun Nov 27, 2016 6:17 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Change in molarity
- Replies: 2
- Views: 639
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.
- Mon Nov 14, 2016 2:24 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentate [ENDORSED]
- Replies: 2
- Views: 865
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.
- Sun Nov 06, 2016 2:30 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3862169
Re: Post All Chemistry Jokes Here
What kind of fish is made out of 2 sodium atoms?
2 Na
2 Na
- Sun Oct 30, 2016 1:11 pm
- Forum: Dipole Moments
- Topic: Polar and Non-polar bond
- Replies: 8
- Views: 2211
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.
- Mon Oct 17, 2016 2:58 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration for Transition metals? [ENDORSED]
- Replies: 1
- Views: 553
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...
- Sun Oct 09, 2016 1:30 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Wavelength (+ or -) [ENDORSED]
- Replies: 1
- Views: 539
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.
- Thu Sep 29, 2016 5:21 pm
- Forum: Photoelectric Effect
- Topic: Wave-Particle Duality and Equations Used
- Replies: 1
- Views: 469
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...