Search found 21 matches
- Fri Mar 11, 2016 10:46 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Heat Capacity
- Replies: 1
- Views: 421
Heat Capacity
If looking at two molecules, for example ethane and ethene, how can you tell which would have a higher heat capacity?
- Sun Mar 06, 2016 8:20 pm
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: Gauch Conformation
- Replies: 2
- Views: 511
Gauch Conformation
I am confused as to what the gauch conformation is. Is it identifiable from a newman projection?
- Thu Feb 25, 2016 11:18 pm
- Forum: *Free Energy of Activation vs Activation Energy
- Topic: Temperature and Activation Energy
- Replies: 2
- Views: 541
Temperature and Activation Energy
Is activation energy independent of temperature?
- Sat Feb 20, 2016 11:58 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Arrow Electron Flow Ex from Course Reader
- Replies: 2
- Views: 591
Arrow Electron Flow Ex from Course Reader
In the course reader example with CH3CH=CHCH3 and H-Br, why does the arrow flow show two electrons moving to the H? How can you tell how many electrons are being transferred?
- Sat Feb 13, 2016 7:56 pm
- Forum: General Rate Laws
- Topic: Integrated vs. Differential Rate Laws
- Replies: 1
- Views: 510
Integrated vs. Differential Rate Laws
How do you know when to use the differential rate law as opposed to the integrated rate law?
- Sat Feb 06, 2016 7:52 pm
- Forum: Balancing Redox Reactions
- Topic: Half Reactions
- Replies: 3
- Views: 699
Half Reactions
In the chart with the half reactions, are the equations given as reduction or oxidation reactions?
- Sat Jan 30, 2016 9:35 pm
- Forum: Balancing Redox Reactions
- Topic: HW #1 CH 14 Oxidation half reactions
- Replies: 1
- Views: 467
HW #1 CH 14 Oxidation half reactions
For question one, part b, it says write and balance the oxidation half reactions. Are we supposed to get this from a chart or do we have to come up with it on our own?
- Sat Jan 23, 2016 2:40 pm
- Forum: Calculating Work of Expansion
- Topic: Unit Conversions
- Replies: 2
- Views: 537
Unit Conversions
When I was looking for work on problem 8.3, the solutions guide converted L x atm to joules by multiplying by 101.325J/L atm. Then when solving 8.9, the solutions guide used gas constants to convert to joules. Could i have just used the 101.325 again and if so why did the book use gas constants to c...
- Sat Jan 16, 2016 10:51 pm
- Forum: Calculating Work of Expansion
- Topic: Work equation
- Replies: 1
- Views: 395
Work equation
Must the system be under constant pressure to use the work equation w=-P x delta V?
- Fri Jan 08, 2016 4:37 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard Enthalpies of Formation H.W. 8.65
- Replies: 1
- Views: 666
Standard Enthalpies of Formation H.W. 8.65
Question 8.65 asks you to calculate the standard enthalpy of formation of dinitrogen pentoxide from the following data: 2NO(g)+O2(g)-> 2NO2(g) with standard enthalpy -114.1 kJ 4NO2(g)+O2(g)-> 2N2O5 with standard enthalpy -110.2kJ and from the standard enthalpy of formation for NO(90.25kJ). In the so...
- Sat Dec 05, 2015 10:45 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Kb and Weak Bases
- Replies: 1
- Views: 602
Kb and Weak Bases
If a titration is between a weak base and a strong acid does that mean you will use Kb when solving for pH?
- Sun Nov 29, 2015 6:26 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Conjugate Seesaw
- Replies: 1
- Views: 1357
Conjugate Seesaw
Can someone please explain conjugate acids and bases? I read the textbook and am still confused.
- Sat Nov 21, 2015 9:49 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Acidity Constant
- Replies: 1
- Views: 651
Acidity Constant
If a solution has a high acidity constant, does that mean it has a higher pKa?
- Sun Nov 15, 2015 3:47 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Endothermic reactions and relationships to K
- Replies: 1
- Views: 523
Endothermic reactions and relationships to K
In endothermic reactions, product formation is favored. Does this mean that when adding heat, reactions will have a higher equilibrium constant?
- Sun Nov 08, 2015 12:25 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Numbers
- Replies: 1
- Views: 514
Coordination Numbers
I know coordination numbers are the number of bonds attached to the central atom. Does it tell us anything about the complex other then the number of ligands bonded to it?
- Sun Nov 01, 2015 11:42 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bond Orders with decimals
- Replies: 3
- Views: 2992
Bond Orders with decimals
What does it mean if something has a bond order with a decimal such as 1.5? Is it not considered a single or double bond but something in between?
- Sun Nov 01, 2015 11:38 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bond Order Stability
- Replies: 1
- Views: 857
Re: Bond Order Stability
As the bond order increases, it becomes more stable. A higher bond order means the bonds are stronger which makes it more stable.
- Sat Oct 24, 2015 10:16 am
- Forum: Hybridization
- Topic: Unhybridized Orbitals
- Replies: 1
- Views: 721
Unhybridized Orbitals
How do you know if one of the orbitals is not hybridized? In the workbook, the example with Ethene has two unhybridized p orbitals. The carbon in this case has a double bond so is that one way to tell if there are unhybridized orbitals?
- Sat Oct 17, 2015 8:37 pm
- Forum: Resonance Structures
- Topic: Resonance Structures and Energy/ Stability
- Replies: 1
- Views: 554
Re: Resonance Structures and Energy/ Stability
In resonance structures, electrons are delocalized. This means the electrons are spread out over several atoms and when the electrons are spread, the molecule will have a lower charge density. A lower charge density makes it more stable.
- Fri Oct 09, 2015 10:27 pm
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity [ENDORSED]
- Replies: 3
- Views: 667
Re: Electron Affinity [ENDORSED]
I believe nitrogen's electron affinity is lower because its outer shell is 2p3 so this means that the sub level is half full which makes it stable. Adding electrons would decrease nitrogen's stability so it is less likely to attract electrons.
- Fri Oct 02, 2015 9:20 pm
- Forum: Einstein Equation
- Topic: H.W. 1.23
- Replies: 1
- Views: 512
H.W. 1.23
This problem asks you to calculate the wavelength of certain rays with an energy of 140.511 keV. I know you have to convert this energy to joules but i am confused as to what the keV means. Is this just a conversion that i should know?