Search found 19 matches

by Eljie_2F
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: 610

Cis and Trans

How do you know when a carbon chain substituent is smaller or larger than a halogen substituent?
by Eljie_2F
Fri Mar 17, 2017 11:23 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017210

Re: Post All Chemistry Jokes Here

I have a greater chance of reaching absolute zero than getting a girlfriend.
by Eljie_2F
Sun Mar 12, 2017 9:57 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 15313

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?
by Eljie_2F
Sun Mar 05, 2017 1:45 pm
Forum: *Electrophiles
Topic: Electrophiles and Nucleophiles for Quiz 3
Replies: 3
Views: 796

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.
by Eljie_2F
Sun Feb 26, 2017 10:19 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017210

Re: Post All Chemistry Jokes Here

IMG_4322.JPG

What in sublimation?!?
by Eljie_2F
Tue Feb 14, 2017 8:19 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017210

Re: Post All Chemistry Jokes Here

Happy Valentine's day
Copper.jpeg
Copper.jpeg (8.68 KiB) Viewed 13589 times
by Eljie_2F
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: 221

Textbook problem 14.23

Why does H2O not appear in the galvanic cell diagram despite it being in the equation?
by Eljie_2F
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: 243

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...
by Eljie_2F
Sat Jan 28, 2017 2:21 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs equilibrium
Replies: 1
Views: 224

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...
by Eljie_2F
Tue Jan 17, 2017 7:43 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017210

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
CsF.jpeg (6.49 KiB) Viewed 6525 times
by Eljie_2F
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: 258

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.
by Eljie_2F
Sat Dec 03, 2016 8:44 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Atomic Orbital Phase [ENDORSED]
Replies: 1
Views: 311

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?
by Eljie_2F
Sun Nov 13, 2016 10:47 pm
Forum: Sigma & Pi Bonds
Topic: orbitals used in bonding
Replies: 1
Views: 470

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 ...
by Eljie_2F
Thu Nov 10, 2016 12:45 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: NH2 Bonds
Replies: 2
Views: 604

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...
by Eljie_2F
Mon Oct 31, 2016 10:31 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Tetrahedral Angles
Replies: 1
Views: 352

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 ...
by Eljie_2F
Sat Oct 22, 2016 10:43 pm
Forum: Hybridization
Topic: Electronegativity, Electron Affinity and Ionization Energy
Replies: 2
Views: 10121

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...
by Eljie_2F
Fri Oct 14, 2016 4:34 pm
Forum: Resonance Structures
Topic: Visual of Resonance
Replies: 2
Views: 313

Visual of Resonance

I am having trouble imagining what a molecule with resonance really looks like. Has anyone found any images?
by Eljie_2F
Mon Oct 10, 2016 12:05 am
Forum: Empirical & Molecular Formulas
Topic: Writing Formulas
Replies: 6
Views: 753

Re: Writing Formulas

Yes. :)))
by Eljie_2F
Thu Sep 29, 2016 4:26 pm
Forum: Properties of Light
Topic: Different ways of looking at light
Replies: 3
Views: 400

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 ...

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