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: 367

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: 312

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: 351

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: 417

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.
Mon Mar 07, 2016 7:11 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Determining Half Reactions
Replies: 1
Views: 239

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: 373

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: 19140

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: 242

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: 274

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: 506

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: 314

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: 359

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: 54400

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: 328

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: 337

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: 712

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: 368

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: 520

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: 501

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: 613

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...

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