Search found 20 matches
- Mon Mar 07, 2016 7:42 pm
- Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
- Topic: 1.26, 28, and 29
- Replies: 2
- Views: 678
Re: 1.26, 28, and 29
You need to specify the side because there is a double bond. A double bond does not have the capability of being able to rotate.
- Mon Mar 07, 2016 7:32 pm
- Forum: General Rate Laws
- Topic: Winter 2011 Final, Q4b
- Replies: 1
- Views: 482
Re: Winter 2011 Final, Q4b
The n refers the reaction order. This helps to cancel the units when multiplied with the molar concentrations.
- Mon Mar 07, 2016 7:23 pm
- Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
- Topic: Potential Energies
- Replies: 1
- Views: 546
Re: Potential Energies
The chair has the least potential energy. The twisted boat has a higher potential energy. The boat has the highest potential energy relative to the others.
- Mon Mar 07, 2016 7:17 pm
- 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: Residual entropy
- Replies: 2
- Views: 636
Re: Residual entropy
This was explained in a previous post.
The link to the post is https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=134&t=2709#p5562
NO has a resonance between the double bond and a triple bond. BF3 is symmetric and has only one configuration.
The link to the post is https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=134&t=2709#p5562
NO has a resonance between the double bond and a triple bond. BF3 is symmetric and has only one configuration.
- Mon Mar 07, 2016 7:11 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Determining Half Reactions
- Replies: 1
- Views: 397
Re: Determining Half Reactions
Generally if the anode and the cathode is not listed, then you find the half reaction that has the largest potential. This reaction is going to be your reduction reaction. The reduction reaction takes place at the cathode and the oxidation reaction takes place at the anode. If the reaction is given,...
- Mon Mar 07, 2016 7:02 pm
- Forum: *Cyclopropanes and Cyclobutanes
- Topic: bond angle strain
- Replies: 1
- Views: 591
Re: bond angle strain
Bond angle strain can apply to noncyclic structures as well. Bond angle strain is defined as the distortion of bond lengths and bond angles.
- Tue Mar 01, 2016 11:23 am
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 3 Winter 2016
- Replies: 48
- Views: 20679
Re: Quiz 3 Winter 2016
Is it acceptable just to use IUPAC, or will we lose points on the quiz/final if we do not use common names?
- Sun Feb 07, 2016 11:20 pm
- Forum: Phase Changes & Related Calculations
- Topic: 2011 Question 3
- Replies: 1
- Views: 451
2011 Question 3
When calculating the final temperature of a solution of water at two different temperatures does the final heat need to be in Kelvins. In the answer key it is in Kelvins and I was wondering if I left my answer in degrees C would I lose points?
- Wed Jan 20, 2016 4:48 pm
- Forum: Phase Changes & Related Calculations
- Topic: 8.87
- Replies: 1
- Views: 473
8.87
To raise the temperature from -5.042 degrees C to Zero degrees C, it says that the heat capacity is 2.03J/C*g. Where do they get 2.03 from? Also when raising the temperature from 100 degrees C to 150.35 degrees C, it says its heat capacity is 2.01J/C*g. Where do they get these values from??
- Fri Jan 08, 2016 3:48 pm
- Forum: Phase Changes & Related Calculations
- Topic: VE & Endothermic and Exothermic Reactions
- Replies: 2
- Views: 997
Re: VE & Endothermic and Exothermic Reactions
Another way to remember the signs of endo/exo reactions is that in order for an endothermic reaction to occur, heat must be added. Therefore, the system gains heat and the sign is positive. For an exothermic reaction, the system loses heat to its surroundings and has a negative sign.
- Fri Jan 08, 2016 3:45 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Work/Internal Energy
- Replies: 1
- Views: 511
Work/Internal Energy
What is the difference between work and internal energy?
- Sun Dec 06, 2015 10:57 am
- Forum: Einstein Equation
- Topic: Energy Calculations
- Replies: 1
- Views: 493
Energy Calculations
When is it the appropriate time to change your energy from negative to positive? For example after solving E= -hR/n^2 you obtain a negative answer.
- Mon Nov 30, 2015 8:10 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: NH3 acid or base?
- Replies: 3
- Views: 64843
Re: NH3 acid or base?
NH3 will always be a base. In fact it is a weak base.
- Mon Nov 30, 2015 8:08 pm
- Forum: Conjugate Acids & Bases
- Topic: Conjugate Seesaw Converse
- Replies: 1
- Views: 516
Conjugate Seesaw Converse
I am aware that the stronger the acid, the weaker its conjugate base will be. Is the converse true. For example the weaker the acid, the stronger its conjugate base.
- Mon Nov 30, 2015 8:03 pm
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: Buffers
- Replies: 1
- Views: 562
Re: Buffers
Buffers work differently depending on whether a strong acid or base is added. For example if you add a strong base into a weak acid, the weak acid will give up protons in order to convert hydroxide ions into water molecules. This does not change the pH as much since the hydroxide ions are being cons...
- Tue Nov 24, 2015 4:52 pm
- Forum: Polyprotic Acids & Bases
- Topic: Acidity of HClO and HClO4
- Replies: 1
- Views: 1299
Acidity of HClO and HClO4
Why is perchloric acid more acidic than hypochlorous acid?
- Sun Nov 08, 2015 11:35 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Precipitate
- Replies: 3
- Views: 702
Re: Precipitate
A precipitate is just a solid that does not dissolve in an aqueous solution as a product. A primary example is AgCl, a white solid that will appear on the bottom of the beaker after a reaction has completed. With a precipitate, its ions cannot dissociate and a solid remains.
- Mon Nov 02, 2015 11:37 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bond Order Correlation
- Replies: 3
- Views: 800
Bond Order Correlation
Does bond order correlate to bond length or bond strength? For example if the bond order increases, would the bond length or bond strength increase?
- Wed Oct 14, 2015 12:05 pm
- Forum: Trends in The Periodic Table
- Topic: Periodic Trend exceptions
- Replies: 1
- Views: 637
Periodic Trend exceptions
Other than the exception of electron affinities between oxygen and nitrogen, are there any other significant exceptions to periodic trends that we need to be aware of?
- Wed Sep 30, 2015 10:25 pm
- Forum: Properties of Light
- Topic: 1.3 manipulating light equations
- Replies: 3
- Views: 1030
Re: 1.3 manipulating light equations
The answer is C by the way. A change in the electrical field is a fancier term for saying that the frequency decreases. These electric fields that are part of the Electromagnetic Radiation push on particles in a given field. This "push" causes the particles to oscillate. Oscillation is the...