Search found 19 matches
- Sat Mar 18, 2017 6:30 pm
- Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
- Topic: Chair conformations Cis and Trans
- Replies: 2
- Views: 1536
Cis and Trans
How do you know when a carbon chain substituent is smaller or larger than a halogen substituent?
- Fri Mar 17, 2017 11:23 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3647911
Re: Post All Chemistry Jokes Here
I have a greater chance of reaching absolute zero than getting a girlfriend.
- Sun Mar 12, 2017 9:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 2 Winter 2017
- Replies: 160
- Views: 24923
Re: Quiz 2 Winter 2017
For number 11 on quiz 2 preparation, how do you use the rate constants and temperatures to find the rate constant at another temperature?
- Sun Mar 05, 2017 1:45 pm
- Forum: *Electrophiles
- Topic: Electrophiles and Nucleophiles for Quiz 3
- Replies: 3
- Views: 1910
Re: Electrophiles and Nucleophiles for Quiz 3
I do not believe you need to know the strength of each electro or nucleophile. But if it is asked, you can estimate through size of atoms and other determinants of electronegativity.
- Sun Feb 26, 2017 10:19 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3647911
Re: Post All Chemistry Jokes Here
What in sublimation?!?
- Tue Feb 14, 2017 8:19 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3647911
Re: Post All Chemistry Jokes Here
Happy Valentine's day
- Copper.jpeg (8.68 KiB) Viewed 27952 times
- Sun Feb 12, 2017 10:09 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Textbook problem 14.23
- Replies: 1
- Views: 388
Textbook problem 14.23
Why does H2O not appear in the galvanic cell diagram despite it being in the equation?
- Sun Feb 05, 2017 1:42 am
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: Entropy
- Replies: 1
- Views: 482
Re: Entropy
The definition of temperature is the amount of movement in temperature. 0 kelvin is defined as the point at which there is no movement in the atoms of the object being observed. Hypothetically, if a perfect crystal were to reach this temperature its entropy would reach zero because there would be no...
- Sat Jan 28, 2017 2:21 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs equilibrium
- Replies: 1
- Views: 449
Re: Gibbs equilibrium
Equilibrium occurs when delta G= 0. Having delta G (not)= 0 is nearly impossible. This is the equilibrium because when delta G = 0, no change in energy can occur while also being a spontaneous process. Any movement from this point will require some sort of energy. If Gr is not equal to Gp then delta...
- Tue Jan 17, 2017 7:43 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3647911
Re: Post All Chemistry Jokes Here
Austin Gee 2N wrote:lilyjustine wrote:Name a more iconic duo...
I'll wait
Name a more ionic duo...
- CsF.jpeg (6.49 KiB) Viewed 23500 times
- Sat Jan 14, 2017 6:07 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: question 8.57
- Replies: 2
- Views: 643
Re: question 8.57
Since delta H sub c is H of combustion, to use the given values for compounds that are created (products), you must reverse the sign of the given value and then add it to the value of the reactants. This will give you the reaction enthalpy for hydrogenation.
- Sat Dec 03, 2016 8:44 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Atomic Orbital Phase [ENDORSED]
- Replies: 1
- Views: 639
Atomic Orbital Phase [ENDORSED]
What does it mean for two orbitals to be in or out of phase? I know this results in bonding and antibonding but why?
- Sun Nov 13, 2016 10:47 pm
- Forum: Sigma & Pi Bonds
- Topic: orbitals used in bonding
- Replies: 1
- Views: 844
orbitals used in bonding
In HCONH2, there is a double bond between Carbon and Oxygen. How do you know which orbitals are used in this double bond? I thought that each atom would hybridize and the bond formations would be sigma(Osp2, Csp2) and pi(O2p, C2p) but others say that the oxygen does not hybridize and that the sigma ...
- Thu Nov 10, 2016 12:45 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: NH2 Bonds
- Replies: 2
- Views: 2803
Re: NH2 Bonds
Hi neighbor, Yes in addition to the 2 electrons nitrogen uses to bond to two hydrogens, it has two lone pairs. This requires an extra electron apart from the 5 supplied by nitrogen and 1 supplied by each hydrogen. This gives nitrogen a formal charge of -1 giving the entire molecule a charge of -1. H...
- Mon Oct 31, 2016 10:31 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Tetrahedral Angles
- Replies: 1
- Views: 989
Re: Tetrahedral Angles
Hi Amber, When looking at an atom in 2D as if all atoms are circles, it is clear that the largest angle 4 atoms around 1 central atom can get is 90 degrees. But in reality, these atoms are spherical in shape, and this results in more space for the atoms to spread out. If all 4 atoms were spread out ...
- Sat Oct 22, 2016 10:43 pm
- Forum: Hybridization
- Topic: Electronegativity, Electron Affinity and Ionization Energy
- Replies: 2
- Views: 24168
Re: Electronegativity, Electron Affinity and Ionization Energy
Ionization energy is the energy that it takes to remove the outermost valence electron from an atom. Since atoms with high ionization energies are less prone to losing electrons, this usually means that these elements are more electronegative and are instead prone to accepting electrons. This is a l...
- Fri Oct 14, 2016 4:34 pm
- Forum: Resonance Structures
- Topic: Visual of Resonance
- Replies: 2
- Views: 726
Visual of Resonance
I am having trouble imagining what a molecule with resonance really looks like. Has anyone found any images?
- Mon Oct 10, 2016 12:05 am
- Forum: Empirical & Molecular Formulas
- Topic: Writing Formulas
- Replies: 6
- Views: 1464
Re: Writing Formulas
Yes. :)))
- Thu Sep 29, 2016 4:26 pm
- Forum: Properties of Light
- Topic: Different ways of looking at light
- Replies: 3
- Views: 801
Different ways of looking at light
Light can be described as behaving like a wave or a photon. When it is described as a wave, it can be said that increasing the intensity of the light increases the amplitude of the wave. When it is described as a photon, it can be said that increasing the intensity of the light increases the number ...