Search found 21 matches

by Niveda_Tennety_1H
Sat Mar 18, 2017 1:30 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: PdeltaV=deltanRT
Replies: 4
Views: 551

PdeltaV=deltanRT

When do you use PdeltaV=deltanRT?
by Niveda_Tennety_1H
Fri Mar 17, 2017 12:10 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Stability of chair and boat isomers
Replies: 1
Views: 201

Stability of chair and boat isomers

How do you know that the CH2s in the boat configuration are closer together than those in the chair configuration? Then, due to fewer electron-electron repulsions, the chair configuration would have a lower potential energy and thus a higher stability right?
by Niveda_Tennety_1H
Thu Mar 16, 2017 8:36 pm
Forum: *Electrophilic Addition
Topic: Electrophilic Addition
Replies: 2
Views: 495

Electrophilic Addition

For an electrophilic addition reaction mechanism of a compound with a double bond and HBr, does the carbon to which the H is added matter?
by Niveda_Tennety_1H
Mon Mar 13, 2017 6:48 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Final Exam Winter 2014 Question 2A
Replies: 1
Views: 224

Final Exam Winter 2014 Question 2A

Question 2A:

For the reaction 2CO(g)+O2(g)-->2CO2(g)
Without doing calculations, predict the sign of Change in entropy of the system.

How do we know that the change in entropy of the system is less than 0?
by Niveda_Tennety_1H
Wed Mar 08, 2017 8:08 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889349

Re: Post All Chemistry Jokes Here

Alkene joke
by Niveda_Tennety_1H
Wed Mar 08, 2017 8:06 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889349

Re: Post All Chemistry Jokes Here

Alkane joke
by Niveda_Tennety_1H
Wed Mar 08, 2017 8:04 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Describing reactions
Replies: 2
Views: 313

Describing reactions

When do you use endergonic and exergonic as opposed to exothermic and endothermic?
by Niveda_Tennety_1H
Tue Feb 14, 2017 1:46 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Winter 2013 Midterm 8B
Replies: 1
Views: 171

Winter 2013 Midterm 8B

For Q8B on the Winter 2013 Midterm, how is n 8? Where are the electrons being transferred in this equation?: Fe(s) (+) 2Ce4+ -->Fe2+ (+) 2Ce3+
by Niveda_Tennety_1H
Sun Feb 12, 2017 1:17 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy and Stability
Replies: 1
Views: 642

Gibbs Free Energy and Stability

For question 9.63, the answer key says that "Compounds with a positive free energy of formation are unstable with respect to the elements." Are spontaneous reaction not unstable (Gibbs free energy for spontaneous reactions is negative, right)?
by Niveda_Tennety_1H
Sat Feb 11, 2017 11:23 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889349

Re: Post All Chemistry Jokes Here

Someone studying atoms is really just a bunch of atoms trying to understand themselves.
by Niveda_Tennety_1H
Sat Feb 11, 2017 7:16 pm
Forum: Phase Changes & Related Calculations
Topic: Change in Entropy [ENDORSED]
Replies: 1
Views: 287

Change in Entropy [ENDORSED]

For calculations involving (Delta S) = nRln(V2/V1), when can you assume that there is only 1 mol of the substance?
by Niveda_Tennety_1H
Mon Nov 28, 2016 10:40 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Heteronuclear Diatomic Molecules
Replies: 2
Views: 330

Heteronuclear Diatomic Molecules

In a molecular orbital diagram for a heteronuclear diatomic molecule that has 1 element from groups 13-15 and another element from groups 16-18, what template must be used? Should the pi 2p orbitals have a lower energy than the sigma 2p or is it vice versa? For example, [BO]-
by Niveda_Tennety_1H
Sun Nov 27, 2016 2:03 pm
Forum: Identifying Acidic & Basic Salts
Topic: Shortcut for determining acidity/basicity of salts
Replies: 1
Views: 805

Shortcut for determining acidity/basicity of salts

Does this shortcut to determine the acidity/basicity of salts always work?
by Niveda_Tennety_1H
Sun Nov 27, 2016 1:39 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Molecular orbital theory of diatomic molecules
Replies: 1
Views: 344

Molecular orbital theory of diatomic molecules

How should you structure a molecular orbital diagram for CO? What is the order of the sigma 2p and pi 2p orbitals?
by Niveda_Tennety_1H
Sat Nov 26, 2016 6:25 pm
Forum: Calculating the pH of Salt Solutions
Topic: classifying acidity/basicity of NaClO
Replies: 1
Views: 336

classifying acidity/basicity of NaClO

Because Na only has a 1+ charge, it cannot be considered an acidic cation right? So, ClO is the only ion reacting with water? Is it the only component in determining the pH of this salt solution? ClO- + H2O-<-> HClO + OH- Because ClO- is the conjugate base of a weak acid, NaClO is a basic salt right...
by Niveda_Tennety_1H
Tue Nov 22, 2016 12:16 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889349

Re: Post All Chemistry Jokes Here

Equilibrium constant. Que?
by Niveda_Tennety_1H
Sat Nov 12, 2016 5:11 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Molecular Orbital CN- [ENDORSED]
Replies: 1
Views: 294

Molecular Orbital CN- [ENDORSED]

For the molecular orbital of CN- does it matter where the extra electron goes? Or, should it go in one of the 2p orbitals of C or N?
by Niveda_Tennety_1H
Tue Oct 25, 2016 6:52 pm
Forum: Lewis Structures
Topic: Formal Charge
Replies: 3
Views: 320

Formal Charge

Is formal charge in any way related to polarity?
by Niveda_Tennety_1H
Sat Oct 08, 2016 3:40 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation [ENDORSED]
Replies: 4
Views: 509

Rydberg Equation [ENDORSED]

Is it usually more efficient to use the Rydberg equation in these types of problems where frequency and an initial/final energy level are provided? In other words, when would you use E=-hR/n^2 over the Rydberg Equation?
by Niveda_Tennety_1H
Thu Sep 29, 2016 2:19 pm
Forum: Photoelectric Effect
Topic: Minimum frequency needed to eject electrons
Replies: 2
Views: 499

Re: Minimum frequency needed to eject electrons

As work function increases does the ionization energy increase? So do metals with larger atomic radii have lower work functions?
by Niveda_Tennety_1H
Thu Sep 29, 2016 2:08 pm
Forum: Photoelectric Effect
Topic: Minimum frequency needed to eject electrons
Replies: 2
Views: 499

Minimum frequency needed to eject electrons

In photoelectric experiments, typically what part of the electromagnetic spectrum is the incoming light? I understand that UV light is typically used, but what is the minimum frequency needed to eject electrons, albeit poorly?

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